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| author | Ingo Molnar <mingo@elte.hu> | 2010-04-23 11:10:28 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-04-23 11:10:30 +0200 |
| commit | 70bce3ba77540ebe77b8c0e1ac38d281a23fbb5e (patch) | |
| tree | 34b09a49228f0949ff49dce66a433b0dfd83a2dc /arch/mips/include/asm/stackframe.h | |
| parent | 6eca8cc35b50af1037bc919106dd6dd332c959c2 (diff) | |
| parent | d5a30458a90597915977f06e79406b664a41b8ac (diff) | |
Merge branch 'linus' into perf/core
Merge reason: merge the latest fixes, update to latest -rc.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/mips/include/asm/stackframe.h')
| -rw-r--r-- | arch/mips/include/asm/stackframe.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/mips/include/asm/stackframe.h b/arch/mips/include/asm/stackframe.h index 3b6da3330e3..c8419129e77 100644 --- a/arch/mips/include/asm/stackframe.h +++ b/arch/mips/include/asm/stackframe.h @@ -121,6 +121,25 @@ .endm #else .macro get_saved_sp /* Uniprocessor variation */ +#ifdef CONFIG_CPU_LOONGSON2F + /* + * Clear BTB (branch target buffer), forbid RAS (return address + * stack) to workaround the Out-of-order Issue in Loongson2F + * via its diagnostic register. + */ + move k0, ra + jal 1f + nop +1: jal 1f + nop +1: jal 1f + nop +1: jal 1f + nop +1: move ra, k0 + li k0, 3 + mtc0 k0, $22 +#endif /* CONFIG_CPU_LOONGSON2F */ #if defined(CONFIG_32BIT) || defined(KBUILD_64BIT_SYM32) lui k1, %hi(kernelsp) #else |