Messages in this thread Patch in this message |  | | Date | Thu, 19 Feb 2015 03:33:50 -0800 | From | tip-bot for Rik van Riel <> | Subject | [tip:x86/fpu] x86/fpu: Use an explicit if/ else in switch_fpu_prepare() |
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Commit-ID: 1361ef29c7e49ae7cf37220c25fac1904b77f71a Gitweb: http://git.kernel.org/tip/1361ef29c7e49ae7cf37220c25fac1904b77f71a Author: Rik van Riel <riel@redhat.com> AuthorDate: Fri, 6 Feb 2015 15:02:03 -0500 Committer: Borislav Petkov <bp@suse.de> CommitDate: Thu, 19 Feb 2015 11:15:54 +0100
x86/fpu: Use an explicit if/else in switch_fpu_prepare()
Use an explicit if/else branch after __save_init_fpu(old) in switch_fpu_prepare(). This makes substituting the assignment with a call in task_disable_lazy_fpu_restore() in the next patch easier to review.
Signed-off-by: Rik van Riel <riel@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Link: http://lkml.kernel.org/r/1423252925-14451-7-git-send-email-riel@redhat.com [ Space out stuff for more readability. ] Signed-off-by: Borislav Petkov <bp@suse.de> --- arch/x86/include/asm/fpu-internal.h | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-)
diff --git a/arch/x86/include/asm/fpu-internal.h b/arch/x86/include/asm/fpu-internal.h index 9c27f44..04c2807 100644 --- a/arch/x86/include/asm/fpu-internal.h +++ b/arch/x86/include/asm/fpu-internal.h @@ -434,13 +434,17 @@ static inline fpu_switch_t switch_fpu_prepare(struct task_struct *old, struct ta * If the task has used the math, pre-load the FPU on xsave processors * or if the past 5 consecutive context-switches used math. */ - fpu.preload = tsk_used_math(new) && (use_eager_fpu() || - new->thread.fpu_counter > 5); + fpu.preload = tsk_used_math(new) && + (use_eager_fpu() || new->thread.fpu_counter > 5); + if (__thread_has_fpu(old)) { if (!__save_init_fpu(old)) - cpu = ~0; - old->thread.fpu.last_cpu = cpu; - old->thread.fpu.has_fpu = 0; /* But leave fpu_owner_task! */ + old->thread.fpu.last_cpu = ~0; + else + old->thread.fpu.last_cpu = cpu; + + /* But leave fpu_owner_task! */ + old->thread.fpu.has_fpu = 0; /* Don't change CR0.TS if we just switch! */ if (fpu.preload) {
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