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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2013-07-02 16:26:44 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-07-02 16:26:44 -0700 |
| commit | d652df0b2f0b9c2e655be0d6f90989fae0a511b4 (patch) | |
| tree | fce939bb45c3d656798d91f7a6dd9d3fbf7189ca /arch/x86/Kconfig.debug | |
| parent | 4d6f843a38fa26035598f1f35181aa5f328db897 (diff) | |
| parent | 5f8c4218148822fde6eebbeefc34bd0a6061e031 (diff) | |
| download | lwn-d652df0b2f0b9c2e655be0d6f90989fae0a511b4.tar.gz lwn-d652df0b2f0b9c2e655be0d6f90989fae0a511b4.zip | |
Merge branch 'x86-fpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 FPU changes from Ingo Molnar:
"There are two bigger changes in this tree:
- Add an [early-use-]safe static_cpu_has() variant and other
robustness improvements, including the new X86_DEBUG_STATIC_CPU_HAS
configurable debugging facility, motivated by recent obscure FPU
code bugs, by Borislav Petkov
- Reimplement FPU detection code in C and drop the old asm code, by
Peter Anvin."
* 'x86-fpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86, fpu: Use static_cpu_has_safe before alternatives
x86: Add a static_cpu_has_safe variant
x86: Sanity-check static_cpu_has usage
x86, cpu: Add a synthetic, always true, cpu feature
x86: Get rid of ->hard_math and all the FPU asm fu
Diffstat (limited to 'arch/x86/Kconfig.debug')
| -rw-r--r-- | arch/x86/Kconfig.debug | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug index b6a770132b67..c963881de0d0 100644 --- a/arch/x86/Kconfig.debug +++ b/arch/x86/Kconfig.debug @@ -303,4 +303,14 @@ config DEBUG_NMI_SELFTEST If unsure, say N. +config X86_DEBUG_STATIC_CPU_HAS + bool "Debug alternatives" + depends on DEBUG_KERNEL + ---help--- + This option causes additional code to be generated which + fails if static_cpu_has() is used before alternatives have + run. + + If unsure, say N. + endmenu |