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authorBecky Bruce <becky.bruce@freescale.com>2007-11-10 09:17:49 +1100
committerPaul Mackerras <paulus@samba.org>2007-11-13 16:22:43 +1100
commitb64f87c16f3c00fe593f632e1ee5798ba3f4f3f4 (patch)
tree1e0c63707b73c4b2f316a01b2e3c6ebd82c6356a /usr/Kconfig
parent64c911a3f7c9864a4bbddbb77b722d5553ddcd32 (diff)
[POWERPC] Avoid unpaired stwcx. on some processors
The context switch code in the kernel issues a dummy stwcx. to clear the reservation, as recommended by the architecture. However, some processors can have issues if this stwcx to address A occurs while the reservation is already held to a different address B. To avoid this problem, the dummy stwcx. needs to be paired with a dummy lwarx to the same address. This adds the dummy lwarx, and creates a cpu feature bit to indicate which cpus are affected. Tested on mpc8641_hpcn_defconfig in arch/powerpc; build tested in arch/ppc. Signed-off-by: Becky Bruce <becky.bruce@freescale.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
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