powerpc/tm: Clear MSR RI in non-recoverable TM code

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When we treclaim and trecheckpoint there's an unavoidable period when r1
will not be a valid kernel stack pointer.

This patch clears the MSR recoverable interrupt (RI) bit over these
regions to indicate we have an invalid kernel stack pointer.

For treclaim, the region over which we clear MSR RI is larger than
required to avoid the need for an extra costly mtmsrd.

Thanks to Paulus for suggesting this change.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

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Michael Neuling 2013-06-28 18:17:09 +10:00 • committed by Benjamin Herrenschmidt

parent 80aa0fb494

commit 090b9284d7

1 changed files with 16 additions and 2 deletions

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arch/powerpc/kernel/tm.S

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