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Hi ! For the same reason as ppc32, we need to ensure that all stores done on a CPU has reached the coherency domain and are visible to loads done by another CPU when context switching as the same thread may be rescheduled almost right away there. Ben. diff -urN linux-2.5/arch/ppc64/kernel/entry.S linuxppc-2.5-benh/arch/ppc64/kernel/entry.S --- linux-2.5/arch/ppc64/kernel/entry.S 2004-03-30 15:15:17.000000000 +1000 +++ linuxppc-2.5-benh/arch/ppc64/kernel/entry.S 2004-03-30 14:55:47.000000000 +1000 @@ -289,6 +289,14 @@ std r23,_CCR(r1) std r1,KSP(r3) /* Set old stack pointer */ +#ifdef CONFIG_SMP + /* We need a sync somewhere here to make sure that if the + * previous task gets rescheduled on another CPU, it sees all + * stores it has performed on this one. + */ + sync +#endif /* CONFIG_SMP */ + addi r6,r4,-THREAD /* Convert THREAD to 'current' */ std r6,PACACURRENT(r13) /* Set new 'current' */ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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