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| author | Rik van Riel <riel@redhat.com> | 2015-02-06 15:02:03 -0500 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2015-02-19 11:15:54 +0100 |
| commit | 1361ef29c7e49ae7cf37220c25fac1904b77f71a (patch) | |
| tree | 1f46331d204c57730fbc58933aaea4e24cb3c342 /arch/x86/include/asm/fpu-internal.h | |
| parent | 33e03dedd759cc9396252d9641b25d01909a26bb (diff) | |
| download | linux-1361ef29c7e49ae7cf37220c25fac1904b77f71a.tar.gz linux-1361ef29c7e49ae7cf37220c25fac1904b77f71a.tar.bz2 linux-1361ef29c7e49ae7cf37220c25fac1904b77f71a.zip | |
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>
Diffstat (limited to 'arch/x86/include/asm/fpu-internal.h')
| -rw-r--r-- | arch/x86/include/asm/fpu-internal.h | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/arch/x86/include/asm/fpu-internal.h b/arch/x86/include/asm/fpu-internal.h index 9c27f44e1c5c..04c2807aab66 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) { |