Commit-ID: 16d9dbf0c2bd167fdd942b83592d59696c7b73bd Gitweb: http://git.kernel.org/tip/16d9dbf0c2bd167fdd942b83592d59696c7b73bd Author: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx> AuthorDate: Fri, 24 Apr 2009 00:50:27 -0700 Committer: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx> CommitDate: Wed, 17 Jun 2009 13:21:26 -0700 x86-64: move unlazy_fpu() into lazy cpu state part of context switch Make sure that unlazy_fpu()'s stts gets batched along with the other cpu state changes during context switch. (32-bit already does this.) This makes sure it gets batched when running paravirtualized. [ Impact: optimise paravirtual FPU context switch ] Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx> Cc: Alok Kataria <akataria@xxxxxxxxxx> Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx> --- arch/x86/kernel/process_64.c | 6 +++--- 1 files changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index ebefb54..c9b8904 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -419,6 +419,9 @@ __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); + /* * Leave lazy mode, flushing any hypercalls made here. * This must be done before restoring TLS segments so @@ -459,9 +462,6 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p) wrmsrl(MSR_KERNEL_GS_BASE, next->gs); prev->gsindex = gsindex; - /* Must be after DS reload */ - unlazy_fpu(prev_p); - /* * Switch the PDA and FPU contexts. */ -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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