diff options
| author | Jiri Slaby <jirislaby@gmail.com> | 2009-04-08 13:31:58 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-04-08 13:46:00 +0200 |
| commit | fcb2ac5bdfa3a7a04fb9749b916f64400f4c35a8 (patch) | |
| tree | c251c870e6f01dafea5e370898e74968b3cda8c4 /arch | |
| parent | Linux 2.6.30-rc1 (diff) | |
| download | linux-fcb2ac5bdfa3a7a04fb9749b916f64400f4c35a8.tar.xz linux-fcb2ac5bdfa3a7a04fb9749b916f64400f4c35a8.zip | |
x86_32: introduce restore_fpu_checking()
Impact: cleanup, prepare FPU code unificaton
Like on x86_64, return an error from restore_fpu and kill the task
if it fails.
Also rename restore_fpu to restore_fpu_checking which allows ifdefs
to be removed in math_state_restore().
Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
LKML-Reference: <1239190320-23952-1-git-send-email-jirislaby@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/include/asm/i387.h | 9 | ||||
| -rw-r--r-- | arch/x86/kernel/traps.c | 5 |
2 files changed, 5 insertions, 9 deletions
diff --git a/arch/x86/include/asm/i387.h b/arch/x86/include/asm/i387.h index 71c9e5183982..09a2d6dfd85b 100644 --- a/arch/x86/include/asm/i387.h +++ b/arch/x86/include/asm/i387.h @@ -185,12 +185,10 @@ static inline void tolerant_fwait(void) asm volatile("fnclex ; fwait"); } -static inline void restore_fpu(struct task_struct *tsk) +static inline int restore_fpu_checking(struct task_struct *tsk) { - if (task_thread_info(tsk)->status & TS_XSAVE) { - xrstor_checking(&tsk->thread.xstate->xsave); - return; - } + if (task_thread_info(tsk)->status & TS_XSAVE) + return xrstor_checking(&tsk->thread.xstate->xsave); /* * The "nop" is needed to make the instructions the same * length. @@ -200,6 +198,7 @@ static inline void restore_fpu(struct task_struct *tsk) "fxrstor %1", X86_FEATURE_FXSR, "m" (tsk->thread.xstate->fxsave)); + return 0; } /* We need a safe address that is cheap to find and that is already diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index a1d288327ff0..d696145855b5 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -839,9 +839,6 @@ asmlinkage void math_state_restore(void) } clts(); /* Allow maths ops (or we recurse) */ -#ifdef CONFIG_X86_32 - restore_fpu(tsk); -#else /* * Paranoid restore. send a SIGSEGV if we fail to restore the state. */ @@ -850,7 +847,7 @@ asmlinkage void math_state_restore(void) force_sig(SIGSEGV, tsk); return; } -#endif + thread->status |= TS_USEDFPU; /* So we fnsave on switch_to() */ tsk->fpu_counter++; } |