提交 085cc281 编写于 作者: I Ingo Molnar

x86/fpu: Add kernel_fpu_disabled()

Instead of open-coded in_kernel_fpu access, Use kernel_fpu_disabled() in
interrupted_kernel_fpu_idle(), matching the other kernel_fpu_*() methods.

Also add some documentation for in_kernel_fpu.
Reviewed-by: NBorislav 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: NIngo Molnar <mingo@kernel.org>
上级 3103ae3a
......@@ -7,6 +7,17 @@
*/
#include <asm/fpu-internal.h>
/*
* Track whether the kernel is using the FPU state
* currently.
*
* This flag is used:
*
* - by IRQ context code to potentially use the FPU
* if it's unused.
*
* - to debug kernel_fpu_begin()/end() correctness
*/
static DEFINE_PER_CPU(bool, in_kernel_fpu);
static void kernel_fpu_disable(void)
......@@ -21,6 +32,11 @@ static void kernel_fpu_enable(void)
this_cpu_write(in_kernel_fpu, false);
}
static bool kernel_fpu_disabled(void)
{
return this_cpu_read(in_kernel_fpu);
}
/*
* Were we in an interrupt that interrupted kernel mode?
*
......@@ -35,7 +51,7 @@ static void kernel_fpu_enable(void)
*/
static bool interrupted_kernel_fpu_idle(void)
{
if (this_cpu_read(in_kernel_fpu))
if (kernel_fpu_disabled())
return false;
if (use_eager_fpu())
......
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