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| author | Cyril Bur <cyrilbur@gmail.com> | 2016-02-29 17:53:48 +1100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2016-03-02 23:34:48 +1100 |
| commit | de2a20aa7237b45d3c14a2505804a8daa95a8f53 (patch) | |
| tree | 13593cbcaa3c487fa1a8a9ce76c1bdc5e50b602f /arch/powerpc/include/asm/switch_to.h | |
| parent | 70fe3d980f5f14d8125869125ba9a0ea95e09c6b (diff) | |
| download | linux-de2a20aa7237b45d3c14a2505804a8daa95a8f53.tar.bz2 | |
powerpc: Prepare for splitting giveup_{fpu, altivec, vsx} in two
This prepares for the decoupling of saving {fpu,altivec,vsx} registers and
marking {fpu,altivec,vsx} as being unused by a thread.
Currently giveup_{fpu,altivec,vsx}() does both however optimisations to
task switching can be made if these two operations are decoupled.
save_all() will permit the saving of registers to thread structs and leave
threads MSR with bits enabled.
This patch introduces no functional change.
Signed-off-by: Cyril Bur <cyrilbur@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm/switch_to.h')
| -rw-r--r-- | arch/powerpc/include/asm/switch_to.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/switch_to.h b/arch/powerpc/include/asm/switch_to.h index 5b268b6be74c..3690041c126a 100644 --- a/arch/powerpc/include/asm/switch_to.h +++ b/arch/powerpc/include/asm/switch_to.h @@ -34,6 +34,7 @@ static inline void disable_kernel_fp(void) msr_check_and_clear(MSR_FP); } #else +static inline void __giveup_fpu(struct task_struct *t) { } static inline void flush_fp_to_thread(struct task_struct *t) { } #endif @@ -46,6 +47,8 @@ static inline void disable_kernel_altivec(void) { msr_check_and_clear(MSR_VEC); } +#else +static inline void __giveup_altivec(struct task_struct *t) { } #endif #ifdef CONFIG_VSX @@ -57,6 +60,8 @@ static inline void disable_kernel_vsx(void) { msr_check_and_clear(MSR_FP|MSR_VEC|MSR_VSX); } +#else +static inline void __giveup_vsx(struct task_struct *t) { } #endif #ifdef CONFIG_SPE @@ -68,6 +73,8 @@ static inline void disable_kernel_spe(void) { msr_check_and_clear(MSR_SPE); } +#else +static inline void __giveup_spe(struct task_struct *t) { } #endif static inline void clear_task_ebb(struct task_struct *t) |