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Commit 085cc281 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

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: default avatarBorislav 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: default avatarIngo Molnar <mingo@kernel.org>
parent 3103ae3a

arch/x86/kernel/fpu/core.c

+17 −1
Original line number Diff line number Diff line
@@ -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())