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| author | Anton Blanchard <anton@samba.org> | 2015-01-06 21:12:08 +1100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-01-27 08:29:40 -0800 |
| commit | e247868d3b9d040730c08e82001f8e34b1273271 (patch) | |
| tree | 9bdc5d1f509f835b7569908cd129fcc2177d5983 /arch/powerpc/platforms | |
| parent | d5471f896bb7a39074c802f22247cf332e4b5551 (diff) | |
| download | linux-rt-e247868d3b9d040730c08e82001f8e34b1273271.tar.gz | |
powernv: Fix OPAL tracepoint code
commit bfe5fda8e7ced129716f5741cf7ed2592a338824 upstream.
Patch c49f63530bb6 ("powernv: Add OPAL tracepoints") has a spurious
store to the stack:
ld r12,opal_tracepoint_refcount@toc(r2); \
std r12,32(r1); \
The store was originally used to save the current tracepoint status
so the entry and the exit tracepoints were always balanced. In the
end I just created a separate path when tracepoints are enabled.
The offset on the stack used for this store is not valid for ABIv2
and it causes strange issues. I noticed it because OPAL console input
was broken.
Fixes: c49f63530bb6 ("powernv: Add OPAL tracepoints")
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/powerpc/platforms')
| -rw-r--r-- | arch/powerpc/platforms/powernv/opal-wrappers.S | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/powerpc/platforms/powernv/opal-wrappers.S b/arch/powerpc/platforms/powernv/opal-wrappers.S index feb549aa3eea..b67ea67eb71b 100644 --- a/arch/powerpc/platforms/powernv/opal-wrappers.S +++ b/arch/powerpc/platforms/powernv/opal-wrappers.S @@ -40,7 +40,6 @@ BEGIN_FTR_SECTION; \ b 1f; \ END_FTR_SECTION(0, 1); \ ld r12,opal_tracepoint_refcount@toc(r2); \ - std r12,32(r1); \ cmpdi r12,0; \ bne- LABEL; \ 1: |