diff options
| author | Mikael Pettersson <[email protected]> | 2010-06-29 15:05:25 -0700 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2010-06-29 15:29:31 -0700 |
| commit | 9c695203a7ddbe49dba5f22f4c941d24f47475df (patch) | |
| tree | 0dcfa624ecb7c5810f7062fe950bf3f0de2e55b2 /lib/is_single_threaded.c | |
| parent | 2952095c6b2eefd068dda0dee6317cf95155a304 (diff) | |
compiler-gcc.h: gcc-4.5 needs noclone and noinline on __naked functions
A __naked function is defined in C but with a body completely implemented
by asm(), including any prologue and epilogue. These asm() bodies expect
standard calling conventions for parameter passing. Older GCCs implement
that correctly, but 4.[56] currently do not, see GCC PR44290. In the
Linux kernel this breaks ARM, causing most arch/arm/mm/copypage-*.c
modules to get miscompiled, resulting in kernel crashes during bootup.
Part of the kernel fix is to augment the __naked function attribute to
also imply noinline and noclone. This patch implements that, and has been
verified to fix boot failures with gcc-4.5 compiled 2.6.34 and 2.6.35-rc1
kernels. The patch is a no-op with older GCCs.
Signed-off-by: Mikael Pettersson <[email protected]>
Signed-off-by: Khem Raj <[email protected]>
Cc: Russell King <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Diffstat (limited to 'lib/is_single_threaded.c')
0 files changed, 0 insertions, 0 deletions