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| author |   Becky Bruce <becky.bruce@freescale.com> | 2007-11-10 09:17:49 +1100 |
|---|---|---|
| committer |   Paul Mackerras <paulus@samba.org> | 2007-11-13 16:22:43 +1100 |
| commit | b64f87c16f3c00fe593f632e1ee5798ba3f4f3f4 (patch) | |
| tree | 1e0c63707b73c4b2f316a01b2e3c6ebd82c6356a /arch/powerpc/kernel/nvram_64.c | |
| parent | Merge branch 'for-2.6.24' of master.kernel.org:/pub/scm/linux/kernel/git/galak/powerpc into merge (diff) | |
| download | linux-dev-b64f87c16f3c00fe593f632e1ee5798ba3f4f3f4.tar.xz linux-dev-b64f87c16f3c00fe593f632e1ee5798ba3f4f3f4.zip | |
[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>
Diffstat (limited to 'arch/powerpc/kernel/nvram_64.c')
0 files changed, 0 insertions, 0 deletions