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2026-04-14Merge tag 'nolibc-20260412-for-7.1-1' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/nolibc/linux-nolibc Pull nolibc updates from Thomas Weißschuh: - Many new features and optimizations to printf() - Rename non-standard symbols to avoid collisions with application code - Support for byteswap.h, endian.h, err.h and asprintf() - 64-bit dev_t - Smaller cleanups and fixes to the code and build system * tag 'nolibc-20260412-for-7.1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/nolibc/linux-nolibc: (61 commits) selftests/nolibc: use gcc 15 tools/nolibc: support UBSAN on gcc tools/nolibc: create __nolibc_no_sanitize_ubsan selftests/nolibc: don't skip tests for unimplemented syscalls anymore selftests/nolibc: explicitly handle ENOSYS from ptrace() tools/nolibc: add byteorder conversions tools/nolibc: add the _syscall() macro tools/nolibc: move the call to __sysret() into syscall() tools/nolibc: rename the internal macros used in syscall() selftests/nolibc: only use libgcc when really necessary selftests/nolibc: test the memory allocator tools/nolibc: check for overflow in calloc() without divisions tools/nolibc: add support for asprintf() tools/nolibc: use __builtin_offsetof() tools/nolibc: use makedev() in fstatat() tools/nolibc: handle all major and minor numbers in makedev() and friends tools/nolibc: make dev_t 64 bits wide tools/nolibc: move the logic of makedev() and friends into functions selftests/nolibc: add a test for stat().st_rdev selftests/nolibc: add some tests for makedev() and friends ...
2026-04-09tools/nolibc: support UBSAN on gccThomas Weißschuh
The UBSAN implementation in gcc requires a slightly different function attribute to skip instrumentation. Extend __nolibc_no_sanitize_undefined to also handle gcc. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Link: https://patch.msgid.link/20260408-nolibc-gcc-15-v1-2-330d0c40f894@weissschuh.net
2026-04-09tools/nolibc: create __nolibc_no_sanitize_ubsanThomas Weißschuh
The logic to disable UBSAN will become a bit more complicated. Move it out into compiler.h, so crt.h stays readable. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Link: https://patch.msgid.link/20260408-nolibc-gcc-15-v1-1-330d0c40f894@weissschuh.net
2026-04-07tools/nolibc: add byteorder conversionsThomas Weißschuh
Add some standard functions to convert between different byte orders. Conveniently the UAPI headers provide all the necessary functionality. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260405-nolibc-bswap-v1-1-f7699ca9cee0@weissschuh.net
2026-04-07tools/nolibc: add the _syscall() macroThomas Weißschuh
The standard syscall() function or macro uses the libc return value convention. Errors returned from the kernel as negative values are stored in errno and -1 is returned. Users who want to avoid using errno don't have a way to call raw syscalls and check the returned error. Add a new macro _syscall() which works like the standard syscall() but passes through the return value from the kernel unchanged. The naming scheme and return values match the named _sys_foo() system call wrappers already part of nolibc. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260405-nolibc-syscall-v1-3-e5b12bc63211@weissschuh.net
2026-04-07tools/nolibc: move the call to __sysret() into syscall()Thomas Weißschuh
__sysret() transforms the return value from the kernel into the libc return value convention. There is no reason for it to be called in the middle of the internals of the syscall() implementation macros. Move the call up, directly into syscall(), to make the code simpler. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260405-nolibc-syscall-v1-2-e5b12bc63211@weissschuh.net
2026-04-07tools/nolibc: rename the internal macros used in syscall()Thomas Weißschuh
These macros are the internal implementation of syscall(). They can not be used by users. Align them with the standard naming scheme for internal symbols. The current name also prevents the addition of an application-usable _syscall() symbol. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260405-nolibc-syscall-v1-1-e5b12bc63211@weissschuh.net
2026-04-06tools/nolibc: check for overflow in calloc() without divisionsThomas Weißschuh
On some architectures without native division instructions the division can generate calls into libgcc/compiler-rt. This library might not be available, so its use should be avoided. Use the compiler builtin to check for overflows without needing a division. The builtin has been available since GCC 3 and clang 3.8. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260404-nolibc-asprintf-v2-1-17d2d0df9763@weissschuh.net
2026-04-06tools/nolibc: add support for asprintf()Thomas Weißschuh
Add support for dynamically allocating formatted strings through asprintf() and vasprintf(). Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260401-nolibc-asprintf-v1-3-46292313439f@weissschuh.net
2026-04-04tools/nolibc: use __builtin_offsetof()Thomas Weißschuh
The current custom implementation of offsetof() fails UBSAN: runtime error: member access within null pointer of type 'struct ...' This means that all its users, including container_of(), free() and realloc(), fail. Use __builtin_offsetof() instead which does not have this issue and has been available since GCC 4 and clang 3. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260401-nolibc-asprintf-v1-1-46292313439f@weissschuh.net
2026-04-04tools/nolibc: use makedev() in fstatat()Thomas Weißschuh
fstatat() contains two open-coded copies of makedev() to handle minor numbers >= 256. Now that the regular makedev() handles both large minor and major numbers correctly use the common function. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260404-nolibc-makedev-v2-6-456a429bf60c@weissschuh.net
2026-04-04tools/nolibc: handle all major and minor numbers in makedev() and friendsThomas Weißschuh
Remove the limitation of only handling small major and minor numbers. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260404-nolibc-makedev-v2-5-456a429bf60c@weissschuh.net
2026-04-04tools/nolibc: make dev_t 64 bits wideThomas Weißschuh
statx() returns both 32-bit minor and major numbers. For both of them to fit into the 'dev_t' in 'struct stat', that needs to be 64 bits wide. The other uses of 'dev_t' in nolibc are makedev() and friends and mknod(). makedev() and friends are going to be adapted in an upcoming commit and mknod() will silently truncate 'dev_t' to 'unsigned int' in the kernel, similar to other libcs. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260404-nolibc-makedev-v2-4-456a429bf60c@weissschuh.net
2026-04-04tools/nolibc: move the logic of makedev() and friends into functionsThomas Weißschuh
Functions make it easier to keep the input and output types straight and avoid duplicate evaluations of their arguments. Also these functions will become a bit more complex to handle full 64-bit 'dev_t' which is easier to read in a function. Still stay compatible with code which expects these to be macros. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260404-nolibc-makedev-v2-3-456a429bf60c@weissschuh.net
2026-04-02tools/nolibc: explicitly list architecture headersThomas Weißschuh
Relying on $(wildcard) is brittle and non-deterministic. similar to all the other headers. Switch the list of architecture headers to an explicit list, Link: https://patch.msgid.link/20260401-nolibc-cleanup-v1-4-bcf4c9f5c1be@weissschuh.net Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-04-02tools/nolibc: drop superfluous definition of QThomas Weißschuh
Q is already defined by tools/scripts/Makefile.include which is included at the top of tools/include/nolibc/Makefile. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Link: https://patch.msgid.link/20260401-nolibc-cleanup-v1-3-bcf4c9f5c1be@weissschuh.net
2026-04-02tools/nolibc: drop superfluous invocation of mkdirThomas Weißschuh
The call to 'mkdir -p $(OUTPUT)sysroot/include' will also create the sysroot directory. Drop the unnecessary explicit invocation of mkdir. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Link: https://patch.msgid.link/20260401-nolibc-cleanup-v1-2-bcf4c9f5c1be@weissschuh.net
2026-04-02tools/nolibc: drop superfluous invocation of 'make headers'Thomas Weißschuh
The headers_install target of the toplevel Makefile will already make sure that the headers are up-to-date. Drop the superfluous explicit invocation. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Link: https://patch.msgid.link/20260401-nolibc-cleanup-v1-1-bcf4c9f5c1be@weissschuh.net
2026-04-01tools/nolibc/printf: Support negative variable width and precisionDavid Laight
For (eg) "%*.*s" treat a negative field width as a request to left align the output (the same as the '-' flag), and a negative precision to request the default precision. Set the default precision to -1 (not INT_MAX) and add explicit checks to the string handling for negative values (makes the tet unsigned). For numeric output check for 'precision >= 0' instead of testing _NOLIBC_PF_FLAGS_CONTAIN(flags, '.'). This needs an inverted test, some extra goto and removes an indentation. The changed conditionals fix printf("%0-#o", 0) - but '0' and '-' shouldn't both be specified. Signed-off-by: David Laight <david.laight.linux@gmail.com> Link: https://patch.msgid.link/20260323112247.3196-1-david.laight.linux@gmail.com Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-22tools headers: Synchronize linux/build_bug.h with the kernel sourcesArnaldo Carvalho de Melo
To pick up the changes in: 6ffd853b0b10e1e2 ("build_bug.h: correct function parameters names in kernel-doc") That just add some comments, addressing this perf tools build warning: Warning: Kernel ABI header differences: diff -u tools/include/linux/build_bug.h include/linux/build_bug.h Please take a look at tools/include/uapi/README for further info on this synchronization process. Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Ian Rogers <irogers@google.com> Cc: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2026-03-22tools headers UAPI: Sync linux/kvm.h with the kernel sourcesArnaldo Carvalho de Melo
To pick the changes in: da142f3d373a6dda ("KVM: Remove subtle "struct kvm_stats_desc" pseudo-overlay") That just rebuilds perf, as these patches don't add any new KVM ioctl to be harvested for the 'perf trace' ioctl syscall argument beautifiers. This addresses this perf build warning: Warning: Kernel ABI header differences: diff -u tools/include/uapi/linux/kvm.h include/uapi/linux/kvm.h Please see tools/include/uapi/README for further details. Cc: Sean Christopherson <seanjc@google.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2026-03-22tools/nolibc: rename sys_foo() functions to _sys_foo()Thomas Weißschuh
The sys_foo() naming scheme used by the syscall wrappers may collide with application symbols. Especially as 'sys_' is an obvious naming scheme an application may choose for its own custom systemcall wrappers. Avoid these conflicts by using an leading underscore which moves the names into the implementation's namespace. This naming scheme was chosen over a '__nolibc_' prefix, as these functions are not an implementation detail but a documented interface meant to be used by applications. While this may break some existing users, adapting them should be straightforward. Given that nolibc is most-likely vendored, no unexpected breakage should happen. No in-tree users are affected. These conflicts happen when compiling some of the kernel selftests with nolibc. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260319-nolibc-namespacing-v1-1-33c22eaddb5e@weissschuh.net
2026-03-22tools/nolibc: avoid -Wundef warning for __STDC_VERSION__Thomas Weißschuh
With -std=c89 the macro __STDC_VERSION__ is not defined. While undefined identifiers in '#if' directives are assumed to be '0', with -Wundef a warning is emitted. Avoid the warning by explicitly falling back to '0' if __STDC_VERSION__ is not provided by the preprocessor. Fixes: 37219aa5b123 ("tools/nolibc: add __nolibc_static_assert()") Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260318-nolibc-wundef-v1-1-fcb7f9ac7298@weissschuh.net
2026-03-22tools/nolibc: add err.hThomas Weißschuh
Add a few convenient helpers to print error and warning messages. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260318-nolibc-err-h-v4-2-08247a694bd9@weissschuh.net
2026-03-22tools/nolibc: add support for program_invocation_{,short_}nameThomas Weißschuh
Add support for the GNU extensions 'program_invocation_name' and 'program_invocation_short_name'. These are useful to print error messages, which by convention include the program name. As these are global variables which take up memory even if not used, similar to 'errno', gate them behind NOLIBC_IGNORE_ERRNO. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260318-nolibc-err-h-v4-1-08247a694bd9@weissschuh.net
2026-03-20tools/nolibc: MIPS: fix clobbers of 'lo' and 'hi' registers on different ISAsThomas Weißschuh
All MIPS ISAs before r6 use the 'lo' and 'hi' special registers. These are clobbered by system calls and need to be marked as such to avoid miscompilations. Currently nolibc ties the clobbers to the ABI. But this is wrong and leads to ISA<->ABI combinations which are not handled correctly, leading to compiler errors or miscompilations. Handle all different combinations of ABI and ISA. Fixes: a6a2a8a42972 ("tools/nolibc: MIPS: add support for N64 and N32 ABIs") Fixes: 66b6f755ad45 ("rcutorture: Import a copy of nolibc") Suggested-by: Maciej W. Rozycki <macro@orcam.me.uk> Link: https://lore.kernel.org/lkml/alpine.DEB.2.21.2603141744240.55200@angie.orcam.me.uk/ Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Link: https://patch.msgid.link/20260317-nolibc-mips-clobber-v2-1-5b9a97761a9e@linutronix.de Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-20tools/nolibc/printf: Add support for octal outputDavid Laight
Octal output isn't often used, but adding it costs very little. Supporting "%#o" is mildly annoying, it has to add a leading '0' if there isn't one present. In simple cases this is the same as adding a sign of '0' - but that adds an extra '0' in a few places. So you need 3 tests, %o, # and no leading '0' (which can only be checked after the zero pad for precision). If all the test are deferred until after zero padding then too many values are 'live' across the call to _nolibc_u64toa_base() and get spilled to stack. Hence the check that ignores the 'sign' if it is the same as the first character of the output string. Add tests for octal output. Signed-off-by: David Laight <david.laight.linux@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260308113742.12649-17-david.laight.linux@gmail.com [Thomas: avoid a -Wsign-compare] Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-20tools/nolibc/printf: Add support for zero padding and field precisionDavid Laight
Includes support for variable field widths (eg "%*.*d"). Zero padding is limited to 31 zero characters. This is wider than the largest numeric field so shouldn't be a problem. All the standard printf formats are now supported except octal and floating point. Add tests for new features Signed-off-by: David Laight <david.laight.linux@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260308113742.12649-16-david.laight.linux@gmail.com [Thomas: fixup testcases for musl libc] Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-20tools/nolibc/printf: Add support for left aligning fieldsDavid Laight
Output the characters before or after the pad - writing the pad takes more code. Include additional/changed tests Signed-off-by: David Laight <david.laight.linux@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260308113742.12649-15-david.laight.linux@gmail.com Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-20tools/nolibc/printf: Special case 0 and add support for %#xDavid Laight
The output for %#x is almost the same as that for %p, both output in hexadecimal with a leading "0x". However for zero %#x should just output "0" (the same as decimal and ocal). For %p match glibc and output "(nil)" rather than "0x0" or "0". Add tests for "%#x", "% d", "%+d" and passing NULL to "%p". Signed-off-by: David Laight <david.laight.linux@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260308113742.12649-14-david.laight.linux@gmail.com [Thomas: fix up testcases for musl libc] Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-20tools/nolibc/printf: Add support for conversion flags space and plusDavid Laight
Flags ' ' and '+' are sign characters for positive numbers. Signed-off-by: David Laight <david.laight.linux@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260308113742.12649-13-david.laight.linux@gmail.com Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-20tools/nolibc/printf: Prepend sign to converted numberDavid Laight
Instead of appending the converted number to the sign, convert first and then prepend the sign (or "0x"). Use the length returned by u64toh_r() instead of calling strlen(). Needed so that zero padding can be inserted between the sign and digits in an upcoming patch. Signed-off-by: David Laight <david.laight.linux@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260308113742.12649-12-david.laight.linux@gmail.com Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-20tools/nolibc/printf: Handle "%s" with the numeric formatsDavid Laight
Avoids the extra va_arg() call with is non-trivial on a lot of modern ABI. Signed-off-by: David Laight <david.laight.linux@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260308113742.12649-11-david.laight.linux@gmail.com Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-20tools/nolibc/printf: Add support for length modifiers tzqL and formats iXDavid Laight
Length modifiers t (ptrdiff_t) and z (size_t) are aliases for l (long), q and L are 64bit the same as j (intmax). Format i is an alias for d and X similar to x but upper case. Supporting them is mostly just adding the relevant bit to the bit pattern used for matching characters. Although %X is detected the output will be lower case. Change/add tests to use conversions i and X, and length modifiers L and ll. Use the correct minimum value for "%Li". Signed-off-by: David Laight <david.laight.linux@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260308113742.12649-10-david.laight.linux@gmail.com [Thomas: Fix up testcases for musl libc] Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-20tools/nolibc/printf: Use bit-masks to hold requested flag, length and ↵David Laight
conversion chars Use flags bits (1u << (ch & 31)) for the flags, length modifiers, and conversion specifiers. This makes it easy to test for multiple values at once. Detect the conversion flags " #+-0" although they are currently all ignored. Unconditionally generate the signed values (for %d) to remove a second set of checks for the size. Separate out the formatting of single characters from numbers. Output the sign for negative values then negate and treat as unsigned. Signed-off-by: David Laight <david.laight.linux@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260308113742.12649-9-david.laight.linux@gmail.com Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-20tools/nolibc/printf: Use goto and reduce indentationDavid Laight
Upcoming changes will need to use goto to jump to the code that outputs characters. Use 'goto do_output' to output a known number of characters. Use 'goto do_strlen_output' to output a '\0' terminated string. Removes a level of indentation from the format processing code. The change is best reviewed using 'git diff -b' after applying it. Signed-off-by: David Laight <david.laight.linux@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260308113742.12649-8-david.laight.linux@gmail.com Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-20tools/nolibc/printf: Simplify __nolibc_printf()David Laight
Move the check for the length modifiers into the format processing between the field width and conversion specifier. This lets the loop be simplified and a 'fast scan' for a format start used. If an error is detected (eg an invalid conversion specifier) then copy the invalid format to the output buffer. Reduces code size by about 10% on x86-64. Some versions of gcc bloat this version by generating a jump table. All goes away in the later patches. Signed-off-by: David Laight <david.laight.linux@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260308113742.12649-7-david.laight.linux@gmail.com Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-20tools/nolibc/printf: Output pad characters in 16 byte chunksDavid Laight
Simple to do and saves calls to the callback function. Change variables written, width and len to 'signed int' to get better code. Signed-off-by: David Laight <david.laight.linux@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260308113742.12649-6-david.laight.linux@gmail.com Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-20tools/nolibc: Rename the 'errnum' parameter to strerror()David Laight
Change the parameter variable name from 'errno' to 'errnum'. Matches any documentation and avoids any issues that might happen if errno is actually a #define (which is not uncommon). Signed-off-by: David Laight <david.laight.linux@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260308113742.12649-5-david.laight.linux@gmail.com Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-20tools/nolibc: Implement strerror() in terms of strerror_r()David Laight
strerror() can be the only part of a program that has a .data section. This requires 4k in the program file. Add a simple implementation of strerror_r() and use that in strerror() so that the "errno=" string is copied at run-time. Use __builtin_memcpy() because that optimises away the input string and just writes the required constants to the target buffer. Code size change largely depends on whether the inlining decision for strerror() changes. Change the tests to use the normal EXPECT_VFPRINTF() when testing %m. Skip the tests when !is_nolibc. Signed-off-by: David Laight <david.laight.linux@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260308113742.12649-4-david.laight.linux@gmail.com Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-20tools/nolibc: Add _NOLIBC_OPTIMIZER_HIDE_VAR() to compiler.hDavid Laight
Needed to stop compiler 'optimisations' bloating code. Equivalent to the definition in include/linux/compiler.h Signed-off-by: David Laight <david.laight.linux@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260308113742.12649-2-david.laight.linux@gmail.com Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-20tools/nolibc/printf: Move snprintf length check to callbackDavid Laight
Move output truncation to the snprintf() callback. This simplifies the main code and fixes truncation of padded fields. Add a zero length callback to 'finalise' the buffer rather than doing it in snprintf() itself. Fixes: e90ce42e81381 ("tools/nolibc: implement width padding in printf()") Signed-off-by: David Laight <david.laight.linux@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260302101815.3043-3-david.laight.linux@gmail.com [Thomas: clean up Fixes trailer] Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-20tools/nolibc/printf: Change variables 'c' to 'ch' and 'tmpbuf[]' to 'outbuf[]'David Laight
Changing 'c' makes the code slightly easier to read because the variable stands out from the single character literals (especially 'c'). Change tmpbuf[] to outbuf[] because 'out' points into it. The following patches pretty much rewrite the function so the churn is limited. Signed-off-by: David Laight <david.laight.linux@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260223101735.2922-7-david.laight.linux@gmail.com Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-20tools/nolibc: Optimise and common up the number to ascii functionsDavid Laight
Implement u[64]to[ah]_r() using a common function that uses multiply by reciprocal to generate the least significant digit first and then reverses the string. On 32bit this is five multiplies (with 64bit product) for each output digit. I think the old utoa_r() always did 36 multiplies and a lot of subtracts - so this is likely faster even for 32bit values. Definitely better for 64bit values (especially small ones). Clearly shifts are faster for base 16, but reversing the output buffer makes a big difference. Sharing the code reduces the footprint (unless gcc decides to constant fold the functions). Definitely helps vfprintf() where the constants get loaded and a single call is done. Also makes it cheap to add octal support to vfprintf for completeness. Signed-off-by: David Laight <david.laight.linux@gmail.com> Link: https://patch.msgid.link/20260223101735.2922-3-david.laight.linux@gmail.com Acked-by: Willy Tarreau <w@1wt.eu> [Thomas: skip int128 multiplication on SPARC and clang] Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-13Merge tag 'perf-tools-fixes-for-v7.0-1-2026-03-13' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools Pull perf tools fixes from Arnaldo Carvalho de Melo: - Fix stale build ID in module MMAP2 records in events synthesized for pre-existing processes - Fix rust cross compilation - hashmap__new() error pointer return handling fixes - Fix off-by-one bug in outside of functions check on the disasm code - Update header copies of kernel headers, including prctl.h, mount.h, fs.h, irq_vectors.h, perf_event.h, gfp_types.h, kvm.h, cpufeatures.h msr-index.h, also the syscall tables files that introduced the 'rseq_slice_yield' syscall - Finish removal of ETM_OPT_* on the ARM coresight support, needed to sync the coresight-pmu.h header with the kernel sources - Make in-target rule robust against too long argument error * tag 'perf-tools-fixes-for-v7.0-1-2026-03-13' of git://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools: (22 commits) perf synthetic-events: Fix stale build ID in module MMAP2 records perf annotate loongarch: Fix off-by-one bug in outside check perf ftrace: Fix hashmap__new() error checking perf annotate: Fix hashmap__new() error checking perf cs-etm: Sync coresight-pmu.h header with the kernel sources perf cs-etm: Finish removal of ETM_OPT_* tools headers UAPI: Update tools' copy of linux/coresight-pmu.h tools headers: Update the syscall tables and unistd.h, to support the new 'rseq_slice_yield' syscall perf disasm: Fix off-by-one bug in outside check tools arch x86: Sync msr-index.h to pick MSR_{OMR_[0-3],CORE_PERF_GLOBAL_STATUS_SET} tools headers UAPI: Sync x86's asm/kvm.h with the kernel sources tools headers x86 cpufeatures: Sync with the kernel sources tools headers UAPI: Sync linux/kvm.h with the kernel sources tools headers: Update the linux/gfp_types.h copy with the kernel sources perf beauty: Update the linux/perf_event.h copy with the kernel sources perf beauty: Update the arch/x86/include/asm/irq_vectors.h copy with the kernel sources perf beauty: Sync UAPI linux/fs.h with kernel sources perf beauty: Sync linux/mount.h copy with the kernel sources tools build: Fix rust cross compilation perf build: Prevent "argument list too long" error ...
2026-03-10Merge tag 'mm-hotfixes-stable-2026-03-09-16-36' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Pull misc fixes from Andrew Morton: "15 hotfixes. 6 are cc:stable. 14 are for MM. Singletons, with one doubleton - please see the changelogs for details" * tag 'mm-hotfixes-stable-2026-03-09-16-36' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: MAINTAINERS, mailmap: update email address for Lorenzo Stoakes mm/mmu_notifier: clean up mmu_notifier.h kernel-doc uaccess: correct kernel-doc parameter format mm/huge_memory: fix a folio_split() race condition with folio_try_get() MAINTAINERS: add co-maintainer and reviewer for SLAB ALLOCATOR MAINTAINERS: add RELAY entry memcg: fix slab accounting in refill_obj_stock() trylock path mm/hugetlb.c: use __pa() instead of virt_to_phys() in early bootmem alloc code zram: rename writeback_compressed device attr tools/testing: fix testing/vma and testing/radix-tree build Revert "ptdesc: remove references to folios from __pagetable_ctor() and pagetable_dtor()" mm/cma: move put_page_testzero() out of VM_WARN_ON in cma_release() mm/damon/core: clear walk_control on inactive context in damos_walk() mm: memfd_luo: always dirty all folios mm: memfd_luo: always make all folios uptodate
2026-03-10perf cs-etm: Sync coresight-pmu.h header with the kernel sourcesJames Clark
Update the header to pull in the changes from commit 3285c471d0c0b991 ("coresight: Remove misleading definitions"). Signed-off-by: James Clark <james.clark@linaro.org> Requested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Tested-by: Leo Yan <leo.yan@arm.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Ian Rogers <irogers@google.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: John Garry <john.g.garry@oracle.com> Cc: Leo Yan <leo.yan@linux.dev> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Mike Leach <mike.leach@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Suzuki Poulouse <suzuki.poulose@arm.com> Cc: Will Deacon <will@kernel.org> Link: https://lore.kernel.org/r/557db631-aef8-43b1-9f45-fae75910ccb4@linaro.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2026-03-05tools headers: Update the syscall tables and unistd.h, to support the new ↵Arnaldo Carvalho de Melo
'rseq_slice_yield' syscall Picking up the changes from these csets: 2153b2e8917b73e9 ("sparc: Add architecture support for clone3") 99d2592023e5d0a3 ("rseq: Implement sys_rseq_slice_yield()") 4ac286c4a8d904c8 ("s390/syscalls: Switch to generic system call table generation") This makes 'perf trace' support it, now its possible, for instance, to do: # perf trace -e rseq_slice_yield --max-stack=16 Here is an example with the 'sendmmsg' syscall: root@x1:~# perf trace -e sendmmsg --max-stack 16 --max-events=1 0.000 ( 0.062 ms): dbus-broker/1012 sendmmsg(fd: 150, mmsg: 0x7ffef57cca50, vlen: 1, flags: DONTWAIT|NOSIGNAL) = 1 syscall_exit_to_user_mode_prepare ([kernel.kallsyms]) syscall_exit_to_user_mode_prepare ([kernel.kallsyms]) syscall_exit_to_user_mode ([kernel.kallsyms]) do_syscall_64 ([kernel.kallsyms]) entry_SYSCALL_64 ([kernel.kallsyms]) [0x117ce7] (/usr/lib64/libc.so.6 (deleted)) root@x1:~# To do a system wide tracing of the new 'rseq_slice_yield' syscall with a backtrace of at most 16 entries. This addresses these perf tools build warnings: Warning: Kernel ABI header differences: diff -u tools/include/uapi/asm-generic/unistd.h include/uapi/asm-generic/unistd.h diff -u tools/scripts/syscall.tbl scripts/syscall.tbl diff -u tools/perf/arch/x86/entry/syscalls/syscall_32.tbl arch/x86/entry/syscalls/syscall_32.tbl diff -u tools/perf/arch/x86/entry/syscalls/syscall_64.tbl arch/x86/entry/syscalls/syscall_64.tbl diff -u tools/perf/arch/powerpc/entry/syscalls/syscall.tbl arch/powerpc/kernel/syscalls/syscall.tbl diff -u tools/perf/arch/s390/entry/syscalls/syscall.tbl arch/s390/kernel/syscalls/syscall.tbl diff -u tools/perf/arch/mips/entry/syscalls/syscall_n64.tbl arch/mips/kernel/syscalls/syscall_n64.tbl diff -u tools/perf/arch/arm/entry/syscalls/syscall.tbl arch/arm/tools/syscall.tbl diff -u tools/perf/arch/sh/entry/syscalls/syscall.tbl arch/sh/kernel/syscalls/syscall.tbl diff -u tools/perf/arch/sparc/entry/syscalls/syscall.tbl arch/sparc/kernel/syscalls/syscall.tbl diff -u tools/perf/arch/xtensa/entry/syscalls/syscall.tbl arch/xtensa/kernel/syscalls/syscall.tbl Cc: Andreas Larsson <andreas@gaisler.com> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Ludwig Rydberg <ludwig.rydberg@gaisler.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@kernel.org> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2026-03-04tools/testing: fix testing/vma and testing/radix-tree buildMike Rapoport (Microsoft)
Build of VMA and radix-tree tests is unhappy after the conversion of kzalloc() to kzalloc_obj() in lib/idr.c: cc -I../shared -I. -I../../include -I../../arch/x86/include -I../../../lib -g -Og -Wall -D_LGPL_SOURCE -fsanitize=address -fsanitize=undefined -DNUM_VMA_FLAG_BITS=128 -DNUM_MM_FLAG_BITS=128 -c -o idr.o idr.c idr.c: In function `ida_alloc_range': idr.c:420:34: error: implicit declaration of function `kzalloc_obj'; did you mean `kzalloc_node'? [-Wimplicit-function-declaration] 420 | bitmap = kzalloc_obj(*bitmap, GFP_NOWAIT); | ^~~~~~~~~~~ | kzalloc_node idr.c:420:32: error: assignment to `struct ida_bitmap *' from `int' makes pointer from integer without a cast [-Wint-conversion] 420 | bitmap = kzalloc_obj(*bitmap, GFP_NOWAIT); | ^ idr.c:447:40: error: assignment to `struct ida_bitmap *' from `int' makes pointer from integer without a cast [-Wint-conversion] 447 | bitmap = kzalloc_obj(*bitmap, GFP_NOWAIT); | ^ idr.c:468:15: error: assignment to `struct ida_bitmap *' from `int' makes pointer from integer without a cast [-Wint-conversion] 468 | alloc = kzalloc_obj(*bitmap, gfp); | ^ make: *** [<builtin>: idr.o] Error 1 Import necessary macros from include/linux to tools/include/linux to fix the compilation. Link: https://lkml.kernel.org/r/20260225233111.2760752-1-rppt@kernel.org Fixes: 69050f8d6d07 ("treewide: Replace kmalloc with kmalloc_obj for non-scalar types") Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org> Tested-by: SeongJae Park <sj@kernel.org> Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: David Hildenbrand <david@kernel.org> Cc: Kees Cook <kees@kernel.org> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2026-03-04tools headers UAPI: Sync linux/kvm.h with the kernel sourcesArnaldo Carvalho de Melo
To pick the changes in: f7ab71f178d56447 ("KVM: s390: Add explicit padding to struct kvm_s390_keyop") 0ee4ddc1647b8b3b ("KVM: s390: Storage key manipulation IOCTL") fa9893fadbc245e1 ("KVM: Introduce KVM_EXIT_SNP_REQ_CERTS for SNP certificate-fetching") f174a9ffcd48d78a ("KVM: arm64: Add exit to userspace on {LD,ST}64B* outside of memslots") That just rebuilds perf, as these patches add just one new KVM ioctl, but for S390, that is not being considered by tools/perf/trace/beauty/kvm_ioctl.sh so far. This addresses this perf build warning: Warning: Kernel ABI header differences: diff -u tools/include/uapi/linux/kvm.h include/uapi/linux/kvm.h Please see tools/include/uapi/README for further details. Cc: Arnd Bergmann <arnd@arndb.de> Cc: Claudio Imbrenda <imbrenda@linux.ibm.com> Cc: Marc Zyngier <maz@kernel.org> Cc: Michael Roth <michael.roth@amd.com> Cc: Sean Christopherson <seanjc@google.com> Cc: Will Deacon <will@kernel.org> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
generated by cgit v1.2.3 (git 2.0.4) at 2026-10-11 22:25:20 +0000