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author | Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> | 2009-04-24 00:40:59 -0700 |
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committer | Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> | 2009-06-17 13:21:25 -0700 |
commit | e6e9cac8c3417b43498b243c1f8f11780e157168 (patch) | |
tree | 4a3a2995f8d930f7baaf19b827043c6f9bf62db3 /arch/x86/include | |
parent | 3fe0344faf7fdcb158bd5c1a9aec960a8d70c8e8 (diff) | |
download | linux-stable-e6e9cac8c3417b43498b243c1f8f11780e157168.tar.gz linux-stable-e6e9cac8c3417b43498b243c1f8f11780e157168.tar.bz2 linux-stable-e6e9cac8c3417b43498b243c1f8f11780e157168.zip |
x86: split out core __math_state_restore
Split the core fpu state restoration out into __math_state_restore, which
assumes that cr0.TS is clear and that the fpu context has been initialized.
This will be used during context switch. There are two reasons this is
desireable:
- There's a small clarification. When __switch_to() calls math_state_restore,
it relies on the fact that tsk_used_math() returns true, and so will
never do a blocking init_fpu(). __math_state_restore() does not have
(or need) that logic, so the question never arises.
- It allows the clts() to be moved earler in __switch_to() so it can be performed
while cpu context updates are batched (will be done in a later patch).
[ Impact: refactor code to make reuse cleaner; no functional change ]
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Alok Kataria <akataria@vmware.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'arch/x86/include')
-rw-r--r-- | arch/x86/include/asm/i387.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/include/asm/i387.h b/arch/x86/include/asm/i387.h index 175adf58dd4f..2e7529295f55 100644 --- a/arch/x86/include/asm/i387.h +++ b/arch/x86/include/asm/i387.h @@ -26,6 +26,7 @@ extern void fpu_init(void); extern void mxcsr_feature_mask_init(void); extern int init_fpu(struct task_struct *child); extern asmlinkage void math_state_restore(void); +extern void __math_state_restore(void); extern void init_thread_xstate(void); extern int dump_fpu(struct pt_regs *, struct user_i387_struct *); |