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(parent: 7ac21cd) | patch
powerpc: Fix register clobbering when accumulating stolen time
authorBenjamin Herrenschmidt <benh@kernel.crashing.org>
Fri, 2 Mar 2012 00:01:31 +0000 (11:01 +1100)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>
Thu, 8 Mar 2012 23:55:16 +0000 (10:55 +1100)
commit990118c84b3e90b2b5354b6e2acd961044d7fa12
treec34310e6d49cffa38d242270e58f661dd90a575dtree | snapshot
parent7ac21cd465391802d931bd5e692302639383b8f5commit | diff
powerpc: Fix register clobbering when accumulating stolen time

When running under a hypervisor that supports stolen time accounting,
we may call C code from the macro EXCEPTION_PROLOG_COMMON in the
exception entry path, which clobbers CR0.

However, the FPU and vector traps rely on CR0 indicating whether we
are coming from userspace or kernel to decide what to do.

So we need to restore that value after the C call

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
arch/powerpc/include/asm/ppc_asm.h diff | blob | history
Domain: System / Kernel;