Commit-ID: a10b6a16cdad88170f546d008c77453cddf918e6 Gitweb: http://git.kernel.org/tip/a10b6a16cdad88170f546d008c77453cddf918e6 Author: Ingo Molnar <[email protected]> AuthorDate: Sat, 23 Sep 2017 14:59:59 +0200 Committer: Ingo Molnar <[email protected]> CommitDate: Sun, 24 Sep 2017 13:04:33 +0200
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 <[email protected]> Cc: Andy Lutomirski <[email protected]> Cc: Andy Lutomirski <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Dave Hansen <[email protected]> Cc: Eric Biggers <[email protected]> Cc: Fenghua Yu <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Oleg Nesterov <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Rik van Riel <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Yu-cheng Yu <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]> --- arch/x86/kernel/fpu/core.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c index bad5724..b7dc383 100644 --- a/arch/x86/kernel/fpu/core.c +++ b/arch/x86/kernel/fpu/core.c @@ -462,9 +462,11 @@ void fpu__clear(struct fpu *fpu) * Make sure fpstate is cleared and initialized. */ if (static_cpu_has(X86_FEATURE_FPU)) { + preempt_disable(); fpu__activate_curr(fpu); user_fpu_begin(); copy_init_fpstate_to_fpregs(); + preempt_enable(); } }
