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authorAnton Blanchard <anton@samba.org>2015-01-06 21:12:08 +1100
committerMichael Ellerman <mpe@ellerman.id.au>2015-01-12 16:40:02 +1100
commitbfe5fda8e7ced129716f5741cf7ed2592a338824 (patch)
tree6828d0b0eb894f80cc90eb79dcd0ba5d0e8e528e /arch
parenteaa27f34e91a14cdceed26ed6c6793ec1d186115 (diff)
powernv: Fix OPAL tracepoint code
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") Cc: <stable@vger.kernel.org> # v3.17+ Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/platforms/powernv/opal-wrappers.S1
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 54eca8b3b288..0509bca5e830 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: