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authorLinus Torvalds <torvalds@linux-foundation.org>2013-07-02 16:26:44 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-07-02 16:26:44 -0700
commitd652df0b2f0b9c2e655be0d6f90989fae0a511b4 (patch)
treefce939bb45c3d656798d91f7a6dd9d3fbf7189ca /arch/x86/Kconfig.debug
parent4d6f843a38fa26035598f1f35181aa5f328db897 (diff)
parent5f8c4218148822fde6eebbeefc34bd0a6061e031 (diff)
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.debug10
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.
+
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