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| author | Paul Mackerras <paulus@samba.org> | 2011-12-05 19:35:32 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2011-12-08 14:22:53 +1100 |
| commit | cba313da5c8ddbe6bba74c9f2b8f6d9e0bc0e723 (patch) | |
| tree | d98c1ca63240f2f13dbaac9769d08da9803d2647 /arch/powerpc/platforms/powernv/smp.c | |
| parent | 33392640424ff775e7d82eab4a51af7b8cc9384d (diff) | |
| download | op-kernel-dev-cba313da5c8ddbe6bba74c9f2b8f6d9e0bc0e723.zip op-kernel-dev-cba313da5c8ddbe6bba74c9f2b8f6d9e0bc0e723.tar.gz | |
powerpc/powernv: Fix problems in onlining CPUs
At present, on the powernv platform, if you off-line a CPU that was
online, and then try to on-line it again, the kernel generates a
warning message "OPAL Error -1 starting CPU n". Furthermore, if the
CPU is a secondary thread that was used by KVM while it was off-line,
the CPU fails to come online.
The first problem is fixed by only calling OPAL to start the CPU the
first time it is on-lined, as indicated by the cpu_start field of its
PACA being zero. The second problem is fixed by restoring the
cpu_start field to 1 instead of 0 when using the CPU within KVM.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/platforms/powernv/smp.c')
| -rw-r--r-- | arch/powerpc/platforms/powernv/smp.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/platforms/powernv/smp.c b/arch/powerpc/platforms/powernv/smp.c index e877366..17210c5 100644 --- a/arch/powerpc/platforms/powernv/smp.c +++ b/arch/powerpc/platforms/powernv/smp.c @@ -75,7 +75,7 @@ int __devinit pnv_smp_kick_cpu(int nr) /* On OPAL v2 the CPU are still spinning inside OPAL itself, * get them back now */ - if (firmware_has_feature(FW_FEATURE_OPALv2)) { + if (!paca[nr].cpu_start && firmware_has_feature(FW_FEATURE_OPALv2)) { pr_devel("OPAL: Starting CPU %d (HW 0x%x)...\n", nr, pcpu); rc = opal_start_cpu(pcpu, start_here); if (rc != OPAL_SUCCESS) |
