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authorIngo Molnar <mingo@kernel.org>2015-05-05 11:34:49 +0200
committerIngo Molnar <mingo@kernel.org>2015-05-19 15:48:12 +0200
commite97131a8391e9fce5126ed54dc66c9d8965d3b4e (patch)
tree8e1db79ae5c956db9a329ed1d76891d7c12535fd /arch/x86/Kconfig.debug
parentd364a7656c1855c940dfa4baf4ebcc3c6a9e6fd2 (diff)
downloadlinux-e97131a8391e9fce5126ed54dc66c9d8965d3b4e.tar.bz2
x86/fpu: Add CONFIG_X86_DEBUG_FPU=y FPU debugging code
There are various internal FPU state debugging checks that never trigger in practice, but which are useful for FPU code development. Separate these out into CONFIG_X86_DEBUG_FPU=y, and also add a couple of new ones. The size difference is about 0.5K of code on defconfig: text data bss filename 15028906 2578816 1638400 vmlinux 15029430 2578816 1638400 vmlinux ( Keep this enabled by default until the new FPU code is debugged. ) Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/Kconfig.debug')
-rw-r--r--arch/x86/Kconfig.debug12
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
index 72484a645f05..2fd3ebbb4e33 100644
--- a/arch/x86/Kconfig.debug
+++ b/arch/x86/Kconfig.debug
@@ -332,4 +332,16 @@ config X86_DEBUG_STATIC_CPU_HAS
If unsure, say N.
+config X86_DEBUG_FPU
+ bool "Debug the x86 FPU code"
+ depends on DEBUG_KERNEL
+ default y
+ ---help---
+ If this option is enabled then there will be extra sanity
+ checks and (boot time) debug printouts added to the kernel.
+ This debugging adds some small amount of runtime overhead
+ to the kernel.
+
+ If unsure, say N.
+
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