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| author | Akira Takeuchi <takeuchi.akr@jp.panasonic.com> | 2010-10-27 17:28:52 +0100 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2010-10-27 17:28:52 +0100 |
| commit | 278d91c4609d55202c1e63d5fc5f01466cc7bbab (patch) | |
| tree | 8b0c863837508959430c1741e2e5a2d37d2890d4 /arch/mn10300/include/asm/system.h | |
| parent | 965ea4bbb9ae926358273368144ba838c561bc38 (diff) | |
| download | blackbird-op-linux-278d91c4609d55202c1e63d5fc5f01466cc7bbab.tar.gz blackbird-op-linux-278d91c4609d55202c1e63d5fc5f01466cc7bbab.zip | |
MN10300: Make the FPU operate in non-lazy mode under SMP
Make the FPU operate in non-lazy mode under SMP so that when the process that
is currently using the FPU migrates to a different CPU, we don't have to ping
its previous CPU to flush the FPU context.
Signed-off-by: Akira Takeuchi <takeuchi.akr@jp.panasonic.com>
Signed-off-by: Kiyoshi Owada <owada.kiyoshi@jp.panasonic.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'arch/mn10300/include/asm/system.h')
| -rw-r--r-- | arch/mn10300/include/asm/system.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/mn10300/include/asm/system.h b/arch/mn10300/include/asm/system.h index 9f7c7e17c01e..3c272a1a1015 100644 --- a/arch/mn10300/include/asm/system.h +++ b/arch/mn10300/include/asm/system.h @@ -19,6 +19,21 @@ #include <linux/kernel.h> #include <linux/irqflags.h> +#if !defined(CONFIG_LAZY_SAVE_FPU) +struct fpu_state_struct; +extern asmlinkage void fpu_save(struct fpu_state_struct *); +#define switch_fpu(prev, next) \ + do { \ + if ((prev)->thread.fpu_flags & THREAD_HAS_FPU) { \ + (prev)->thread.fpu_flags &= ~THREAD_HAS_FPU; \ + (prev)->thread.uregs->epsw &= ~EPSW_FE; \ + fpu_save(&(prev)->thread.fpu_state); \ + } \ + } while (0) +#else +#define switch_fpu(prev, next) do {} while (0) +#endif + struct task_struct; struct thread_struct; @@ -30,6 +45,7 @@ struct task_struct *__switch_to(struct thread_struct *prev, /* context switching is now performed out-of-line in switch_to.S */ #define switch_to(prev, next, last) \ do { \ + switch_fpu(prev, next); \ current->thread.wchan = (u_long) __builtin_return_address(0); \ (last) = __switch_to(&(prev)->thread, &(next)->thread, (prev)); \ mb(); \ |
