sched/preempt, MIPS: Properly lock access to the FPU
Let's always disable preemption and pagefaults when locking the fpu, so we can be sure that the owner won't change in between. This is a preparation for pagefault_disable() not touching preemption anymore. Reviewed-and-tested-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: David.Laight@ACULAB.COM Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: airlied@linux.ie Cc: akpm@linux-foundation.org Cc: benh@kernel.crashing.org Cc: bigeasy@linutronix.de Cc: borntraeger@de.ibm.com Cc: daniel.vetter@intel.com Cc: heiko.carstens@de.ibm.com Cc: herbert@gondor.apana.org.au Cc: hocko@suse.cz Cc: hughd@google.com Cc: mst@redhat.com Cc: paulus@samba.org Cc: ralf@linux-mips.org Cc: schwidefsky@de.ibm.com Cc: yang.shi@windriver.com Link: http://lkml.kernel.org/r/1431359540-32227-15-git-send-email-dahi@linux.vnet.ibm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -28,12 +28,7 @@ extern void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs,
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extern int fpcsr_pending(unsigned int __user *fpcsr);
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/* Make sure we will not lose FPU ownership */
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#ifdef CONFIG_PREEMPT
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#define lock_fpu_owner() preempt_disable()
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#define unlock_fpu_owner() preempt_enable()
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#else
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#define lock_fpu_owner() pagefault_disable()
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#define unlock_fpu_owner() pagefault_enable()
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#endif
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#define lock_fpu_owner() ({ preempt_disable(); pagefault_disable(); })
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#define unlock_fpu_owner() ({ pagefault_enable(); preempt_enable(); })
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#endif /* __SIGNAL_COMMON_H */
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