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| author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2010-05-31 14:07:15 +0400 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2010-05-31 14:07:15 +0400 |
| commit | e37c83c06c2690157a989df40dc99a6b61c9ea15 (patch) | |
| tree | 024dfb8b2c9abeec9ca7cb0c0136c276d9aacc91 /arch/mips/include/asm/stackframe.h | |
| parent | ce1f7d30766f6549db6fa0b9e595e0d26a5b7d9a (diff) | |
| parent | 67a3e12b05e055c0415c556a315a3d3eb637e29e (diff) | |
| download | linux-e37c83c06c2690157a989df40dc99a6b61c9ea15.tar.xz | |
Merge commit 'v2.6.35-rc1' into for-2.6.36
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 3b6da3330e32..58730c5ce4bf 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_JUMP_WORKAROUNDS + /* + * 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 |