3.0-stable review patch. If anyone has any objections, please let me know.
------------------ From: Linus Torvalds <[email protected]> commit b6c66418dcad0fcf83cd1d0a39482db37bf4fc41 upstream. Touching TS_USEDFPU without touching CR0.TS is confusing, so don't do it. By moving it into the callers, we always do the TS_USEDFPU next to the CR0.TS accesses in the source code, and it's much easier to see how the two go hand in hand. Signed-off-by: Linus Torvalds <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- arch/x86/include/asm/i387.h | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) --- a/arch/x86/include/asm/i387.h +++ b/arch/x86/include/asm/i387.h @@ -259,7 +259,6 @@ static inline void fpu_save_init(struct static inline void __save_init_fpu(struct task_struct *tsk) { fpu_save_init(&tsk->thread.fpu); - task_thread_info(tsk)->status &= ~TS_USEDFPU; } static inline int fpu_fxrstor_checking(struct fpu *fpu) @@ -290,6 +289,7 @@ static inline void __unlazy_fpu(struct t { if (task_thread_info(tsk)->status & TS_USEDFPU) { __save_init_fpu(tsk); + task_thread_info(tsk)->status &= ~TS_USEDFPU; stts(); } else tsk->fpu_counter = 0; @@ -356,9 +356,11 @@ static inline void kernel_fpu_begin(void WARN_ON_ONCE(!irq_fpu_usable()); preempt_disable(); - if (me->status & TS_USEDFPU) + if (me->status & TS_USEDFPU) { __save_init_fpu(me->task); - else + me->status &= ~TS_USEDFPU; + /* We do 'stts()' in kernel_fpu_end() */ + } else clts(); } @@ -449,6 +451,7 @@ static inline void save_init_fpu(struct WARN_ON_ONCE(!(task_thread_info(tsk)->status & TS_USEDFPU)); preempt_disable(); __save_init_fpu(tsk); + task_thread_info(tsk)->status &= ~TS_USEDFPU; stts(); preempt_enable(); } -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
