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authorThomas Gleixner <tglx@linutronix.de>2012-05-07 17:59:47 +0000
committerThomas Gleixner <tglx@linutronix.de>2012-05-08 12:35:05 +0200
commit9cd75e13de2dcf32ecc21c7f277cff3c0ced059e (patch)
treeee14db83846f870aff7cc9e4c5e20633bc2c0136 /include/linux/smp.h
parentmips: Use PAGE_SIZE for INIT_TASK_DATA alignment again (diff)
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powerpc: Fix broken cpu_idle_wait() implementation
commit 771dae818 (powerpc/cpuidle: Add cpu_idle_wait() to allow switching of idle routines) implemented cpu_idle_wait() for powerpc. The changelog says: "The equivalent routine for x86 is in arch/x86/kernel/process.c but the powerpc implementation is different.": Unfortunately the changelog is completely useless as it does not tell _WHY_ it is different. Aside of being different the implementation is patently wrong. The rescheduling IPI is async. That means that there is no guarantee, that the other cores have executed the IPI when cpu_idle_wait() returns. But that's the whole purpose of this function: to guarantee that no CPU uses the old idle handler anymore. Use the smp_functional_call() based implementation, which fulfils the requirements. [ This code is going to replaced by a core version to remove all the pointless copies in arch/*, but this one should go to stable ] Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: Deepthi Dharwar <deepthi@linux.vnet.ibm.com> Cc: Trinabh Gupta <g.trinabh@gmail.com> Cc: Arun R Bharadwaj <arun.r.bharadwaj@gmail.com> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Link: http://lkml.kernel.org/r/20120507175651.980164748@linutronix.de Cc: stable@vger.kernel.org
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