x86/fpu: Add debug check to kernel_fpu_disable()
authorIngo Molnar <mingo@kernel.org>
Wed, 22 Apr 2015 14:40:56 +0000 (16:40 +0200)
committerIngo Molnar <mingo@kernel.org>
Tue, 19 May 2015 13:47:20 +0000 (15:47 +0200)
commit3103ae3a6d3e66d51bb883bb17b55574e163b77d
tree0499a374e7da23e5a9ac080a9ab8586c91f33417
parent416d49ac67ae3af8c98ecee2ebe0a883b95e213a
x86/fpu: Add debug check to kernel_fpu_disable()

We are not supposed to call kernel_fpu_disable() if we have not
previously enabled it.

Also use kernel_fpu_disable()/enable() in the __kernel_fpu_begin/end()
primitives, instead of writing to in_kernel_fpu directly,
so that we get the debugging checks.

Reviewed-by: Borislav Petkov <bp@alien8.de>
Cc: Andy Lutomirski <luto@amacapital.net>
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>
arch/x86/kernel/fpu/core.c