linux-toradex.git/scripts/namespace.pl, branch v4.11-rc3

kallsyms: add support for relative offsets in kallsyms address table

2016-03-15T23:55:16+00:00

Similar to how relative extables are implemented, it is possible to emit
the kallsyms table in such a way that it contains offsets relative to
some anchor point in the kernel image rather than absolute addresses.

On 64-bit architectures, it cuts the size of the kallsyms address table
in half, since offsets between kernel symbols can typically be expressed
in 32 bits.  This saves several hundreds of kilobytes of permanent
.rodata on average.  In addition, the kallsyms address table is no
longer subject to dynamic relocation when CONFIG_RELOCATABLE is in
effect, so the relocation work done after decompression now doesn't have
to do relocation updates for all these values.  This saves up to 24
bytes (i.e., the size of a ELF64 RELA relocation table entry) per value,
which easily adds up to a couple of megabytes of uncompressed __init
data on ppc64 or arm64.  Even if these relocation entries typically
compress well, the combined size reduction of 2.8 MB uncompressed for a
ppc64_defconfig build (of which 2.4 MB is __init data) results in a ~500
KB space saving in the compressed image.

Since it is useful for some architectures (like x86) to retain the
ability to emit absolute values as well, this patch also adds support
for capturing both absolute and relative values when
KALLSYMS_ABSOLUTE_PERCPU is in effect, by emitting absolute per-cpu
addresses as positive 32-bit values, and addresses relative to the
lowest encountered relative symbol as negative values, which are
subtracted from the runtime address of this base symbol to produce the
actual address.

Support for the above is enabled by default for all architectures except
IA-64 and Tile-GX, whose symbols are too far apart to capture in this
manner.

Signed-off-by: Ard Biesheuvel 
Tested-by: Guenter Roeck 
Reviewed-by: Kees Cook 
Tested-by: Kees Cook 
Cc: Heiko Carstens 
Cc: Michael Ellerman 
Cc: Ingo Molnar 
Cc: H. Peter Anvin 
Cc: Benjamin Herrenschmidt 
Cc: Michal Marek 
Cc: Rusty Russell 
Cc: Arnd Bergmann 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Revert "namespace: add source file location exceptions"

2010-10-27T22:59:56+00:00

This reverts commit 24a54f7974a616385b96cd939e004592e2cea484.

Stephen Hemminger  writes:
> That patch should not be included. It causes more problems than it
> solves, since then there are duplicate file locations which causes
> false duplicate symbol reports.

Reported-by: Stephen Hemminger 
Signed-off-by: Michal Marek

namespace: add source file location exceptions

2010-10-27T22:29:48+00:00

Teach namespace checker about some special case files where the
source is in unusual location.  This fixes many of the source file
not found errors (more can be added), and also prevents false positives
for functions not being used.

Signed-off-by: Stephen Hemminger 
Signed-off-by: Michal Marek

scripts/namespace.pl: improve to get more correct results

2010-10-27T22:07:46+00:00

Exclude more symbols from arch/x86/vdso/ and arch/x86/boot/; add some more
linker-defined symbols into exception list; add other cond_syscalls
besides "sys_*".

Signed-off-by: Amerigo Wang 
Cc: Stephen Hemminger 
Cc: Michal Marek 
Signed-off-by: Andrew Morton 
Signed-off-by: Michal Marek

scripts/namespace.pl: some bug fixes

2010-10-27T22:07:46+00:00

1. Teach namespace.pl to understand "V" and "v"
2. cond_syscalls are moved into kernel/sys_ni.c

Signed-off-by: Amerigo Wang 
Cc: Stephen Hemminger 
Cc: Michal Marek 
Signed-off-by: Andrew Morton 
Signed-off-by: Michal Marek

scripts/namespace.pl: update file exclusion list

2010-10-27T22:07:45+00:00

Signed-off-by: Stephen Hemminger 
Signed-off-by: Amerigo Wang 
Cc: Michal Marek 
Signed-off-by: Andrew Morton 
Signed-off-by: Michal Marek

scripts/namespace.pl: fix wrong source path

2010-10-27T22:07:45+00:00

File::Find will do chdir automatically, so we need to get the absolute
patch with $File::Find::dir.

Reported-by: Stephen Hemminger 
Signed-off-by: Amerigo Wang 
Cc: Michal Marek 
Signed-off-by: Andrew Morton 
Signed-off-by: Michal Marek

namespace: perlcritic warnings

2010-03-07T20:38:32+00:00

Use local file handle not global.
Make loop and other variables local in scope.

Signed-off-by: Stephen Hemminger 
Cc: Hui Zhu 
Cc: Cong Wang 
Cc: Michal Marek 
Signed-off-by: Andrew Morton 
Signed-off-by: Michal Marek

x86: fixup the x86 namespace change in scripts/namespace.pl

2007-10-11T15:56:02+00:00

Let namespace.pl look at the correct files.

Signed-off-by: Thomas Gleixner 
Signed-off-by: Ingo Molnar

kbuild: fix mode of checkstack.pl and other files.

2006-04-11T11:37:07+00:00

Make it executable like it should be. Do the same for other files intended to be
executed by the user - the ones called by the build process needn't be
executable as they already work (as argument to their interpreter).

Signed-off-by: Paolo 'Blaisorblade' Giarrusso 
Signed-off-by: Sam Ravnborg