Commit a10b6a16 authored by Ingo Molnar's avatar Ingo Molnar

x86/fpu: Make the fpu state change in fpu__clear() scheduler-atomic

Do this temporarily only, to make it easier to change the FPU state machine,
in particular this change couples the fpu->fpregs_active and fpu->fpstate_active
states: they are only set/cleared together (as far as the scheduler sees them).

This will be removed by later patches.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-17-mingo@kernel.orgSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent b3a16308
...@@ -462,9 +462,11 @@ void fpu__clear(struct fpu *fpu) ...@@ -462,9 +462,11 @@ void fpu__clear(struct fpu *fpu)
* Make sure fpstate is cleared and initialized. * Make sure fpstate is cleared and initialized.
*/ */
if (static_cpu_has(X86_FEATURE_FPU)) { if (static_cpu_has(X86_FEATURE_FPU)) {
preempt_disable();
fpu__activate_curr(fpu); fpu__activate_curr(fpu);
user_fpu_begin(); user_fpu_begin();
copy_init_fpstate_to_fpregs(); copy_init_fpstate_to_fpregs();
preempt_enable();
} }
} }
......
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