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| author | JP Abgrall <jpa@google.com> | 2012-04-24 21:45:20 -0700 |
|---|---|---|
| committer | JP Abgrall <jpa@google.com> | 2012-04-24 21:45:20 -0700 |
| commit | 10add970b62d2276541af9e5fb0581d6d8434db4 (patch) | |
| tree | afd79e8507c5fa243c044a6963072b6a6d0f059b /arch/x86/kernel/process_64.c | |
| parent | 9cea9c804af57f8538dc910e24c407c81e496e51 (diff) | |
| parent | 66510aa1148e3457e7d46e0a2582dac7c591b95d (diff) | |
| download | kernel_samsung_crespo-10add970b62d2276541af9e5fb0581d6d8434db4.zip kernel_samsung_crespo-10add970b62d2276541af9e5fb0581d6d8434db4.tar.gz kernel_samsung_crespo-10add970b62d2276541af9e5fb0581d6d8434db4.tar.bz2 | |
Merge remote-tracking branch 'common/android-3.0' into android-samsung-30-wip-mergedown
* common/android-3.0: (1178 commits)
cpufreq: interactive: remove unused target_validate_time_in_idle
cpufreq: interactive: Boost frequency on touchscreen input
cpufreq: Separate speed target revalidate time and initial set time
cpufreq: interactive: based hispeed bump on target freq, not actual
cpufreq: interactive: adjust code and documentation to match
cpufreq: interactive: configurable delay before raising above hispeed
sync: add poll support
sw_sync: add fill_driver_data support
sync: add ioctl to get fence data
sw_sync: add debug support
sync: add debugfs support
sync: add timestamps to sync_pts
sw_sync: add cpu based sync driver
sync: Add synchronization framework
Linux 3.0.28
Bluetooth: Fix l2cap conn failures for ssp devices
TOMOYO: Fix mount flags checking order.
iommu/amd: Make sure IOMMU interrupts are re-enabled on resume
cred: copy_process() should clear child->replacement_session_keyring
ASoC: ak4642: fixup: mute needs +1 step
...
Conflicts:
mm/compaction.c
Change-Id: I3dc59225d2435eddbed0c639155179e580891ac8
Signed-off-by: JP Abgrall <jpa@google.com>
Diffstat (limited to 'arch/x86/kernel/process_64.c')
| -rw-r--r-- | arch/x86/kernel/process_64.c | 29 |
1 files changed, 4 insertions, 25 deletions
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index 63c8aed..eeb5004 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -363,18 +363,9 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p) int cpu = smp_processor_id(); struct tss_struct *tss = &per_cpu(init_tss, cpu); unsigned fsindex, gsindex; - bool preload_fpu; + fpu_switch_t fpu; - /* - * If the task has used fpu the last 5 timeslices, just do a full - * restore of the math state immediately to avoid the trap; the - * chances of needing FPU soon are obviously high now - */ - preload_fpu = tsk_used_math(next_p) && next_p->fpu_counter > 5; - - /* we're going to use this soon, after a few expensive things */ - if (preload_fpu) - prefetch(next->fpu.state); + fpu = switch_fpu_prepare(prev_p, next_p); /* * Reload esp0, LDT and the page table pointer: @@ -404,13 +395,6 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p) load_TLS(next, cpu); - /* Must be after DS reload */ - __unlazy_fpu(prev_p); - - /* Make sure cpu is ready for new context */ - if (preload_fpu) - clts(); - /* * Leave lazy mode, flushing any hypercalls made here. * This must be done before restoring TLS segments so @@ -451,6 +435,8 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p) wrmsrl(MSR_KERNEL_GS_BASE, next->gs); prev->gsindex = gsindex; + switch_fpu_finish(next_p, fpu); + /* * Switch the PDA and FPU contexts. */ @@ -469,13 +455,6 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p) task_thread_info(prev_p)->flags & _TIF_WORK_CTXSW_PREV)) __switch_to_xtra(prev_p, next_p, tss); - /* - * Preload the FPU context, now that we've determined that the - * task is likely to be using it. - */ - if (preload_fpu) - __math_state_restore(); - return prev_p; } |