diff options
| author | Ingo Molnar <mingo@kernel.org> | 2015-05-05 11:34:49 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-05-19 15:48:12 +0200 |
| commit | e97131a8391e9fce5126ed54dc66c9d8965d3b4e (patch) | |
| tree | 8e1db79ae5c956db9a329ed1d76891d7c12535fd /arch/x86/kernel/fpu/xstate.c | |
| parent | d364a7656c1855c940dfa4baf4ebcc3c6a9e6fd2 (diff) | |
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/kernel/fpu/xstate.c')
| -rw-r--r-- | arch/x86/kernel/fpu/xstate.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c index 201f08feb259..5724098adf1b 100644 --- a/arch/x86/kernel/fpu/xstate.c +++ b/arch/x86/kernel/fpu/xstate.c @@ -262,6 +262,11 @@ static void __init setup_xstate_comp(void) */ static void __init setup_init_fpu_buf(void) { + static int on_boot_cpu = 1; + + WARN_ON_FPU(!on_boot_cpu); + on_boot_cpu = 0; + if (!cpu_has_xsave) return; @@ -317,6 +322,10 @@ static void __init init_xstate_size(void) void __init fpu__init_system_xstate(void) { unsigned int eax, ebx, ecx, edx; + static int on_boot_cpu = 1; + + WARN_ON_FPU(!on_boot_cpu); + on_boot_cpu = 0; if (!cpu_has_xsave) { pr_info("x86/fpu: Legacy x87 FPU detected.\n"); @@ -324,7 +333,7 @@ void __init fpu__init_system_xstate(void) } if (boot_cpu_data.cpuid_level < XSTATE_CPUID) { - WARN(1, "x86/fpu: XSTATE_CPUID missing!\n"); + WARN_ON_FPU(1); return; } |