linux-toradex.git/arch/xtensa/kernel/xtensa_ksyms.c, branch v4.19

xtensa: use generic strncpy_from_user with KASAN

2017-12-17T23:34:57+00:00

This enables KASAN check of the destination buffer.

Signed-off-by: Max Filippov

xtensa: add support for KASAN

2017-12-17T06:37:12+00:00

Cover kernel addresses above 0x90000000 by the shadow map. Enable
HAVE_ARCH_KASAN when MMU is enabled. Provide kasan_early_init that fills
shadow map with writable copies of kasan_zero_page. Call
kasan_early_init right after mmu initialization in the setup_arch.
Provide kasan_init that allocates proper shadow map pages from the
memblock and puts these pages into the shadow map for addresses from
VMALLOC area to the end of KSEG. Call kasan_init right after memblock
initialization. Don't use KASAN for the boot code, MMU and KASAN
initialization and page fault handler. Make kernel stack size 4 times
larger when KASAN is enabled to avoid stack overflows.
GCC 7.3, 8 or newer is required to build the xtensa kernel with KASAN.

Signed-off-by: Max Filippov

xtensa: don't limit csum_partial export by CONFIG_NET

2017-08-01T18:17:30+00:00

csum_partial and csum_partial_copy_generic are defined unconditionally
and are available even when CONFIG_NET is disabled. They are used not
only by the network drivers, but also by scsi and media.
Don't limit these functions export by CONFIG_NET.

Cc: stable@vger.kernel.org
Signed-off-by: Max Filippov

Replace with globally

2016-12-24T19:46:01+00:00

This was entirely automated, using the script by Al:

  PATT='^[[:blank:]]*#[[:blank:]]*include[[:blank:]]*'
  sed -i -e "s!$PATT!#include !" \
        $(git grep -l "$PATT"|grep -v ^include/linux/uaccess.h)

to do the replacement at the end of the merge window.

Requested-by: Al Viro 
Signed-off-by: Linus Torvalds

xtensa: export __{invalidate,flush}_dcache_range

2014-04-01T21:35:50+00:00

Signed-off-by: Max Filippov

xtensa: Export __invalidate_icache_range

2014-04-01T21:35:49+00:00

When modular code calls flush_icache_range():

    ERROR: "__invalidate_icache_range" [drivers/misc/lkdtm.ko] undefined!
    make[1]: *** [__modpost] Error 1

Signed-off-by: Geert Uytterhoeven 
Reviewed-by: Kees Cook 
Signed-off-by: Max Filippov

xtensa: fix fast_syscall_spill_registers

2014-01-29T21:47:26+00:00

The original implementation could clobber registers under certain conditions.

The Xtensa processor architecture uses windowed registers and the original
implementation was using a4 as a temporary register, which under certain
conditions could be register a0 of the oldest window frame, and didn't always
restore the content correctly.

By moving the _spill_registers routine inside the fast system call, it frees
up one more register (the return address is not required anymore) for the
spill routine.

Signed-off-by: Chris Zankel

xtensa: Fix broken allmodconfig build

2013-09-06T16:50:56+00:00

xtansa allmodbuild fails with:

arch/xtensa/kernel/xtensa_ksyms.c:129:1: error: '_mcount' undeclared here (not in a function)
make[2]: *** [arch/xtensa/kernel/xtensa_ksyms.o] Error 1
make[1]: *** [arch/xtensa/kernel] Error 2

The breakage is due to commit 478ba61af (xtensa: add static function tracer
support) which exports _mcount without declaring it.

Cc: Max Filippov 
Signed-off-by: Guenter Roeck 
Signed-off-by: Chris Zankel

xtensa: add static function tracer support

2013-07-08T08:18:57+00:00

Signed-off-by: Max Filippov 
Signed-off-by: Chris Zankel

xtensa: fix oprofile building as module

2013-05-09T08:07:09+00:00

Signed-off-by: Max Filippov 
Signed-off-by: Chris Zankel