powerpc/tracing: TRACE_WITH_FRAME_BUFFER creates invalid stack frames

TRACE_WITH_FRAME_BUFFER creates 32 byte stack frames. On ppc64
ABIv1 this is too small and a callee could corrupt the stack by
writing to the parameter save area (starting at offset 48).

Signed-off-by: Anton Blanchard <anton@samba.org>

diff --git a/arch/powerpc/include/asm/irqflags.h b/arch/powerpc/include/asm/irqflags.h
index f62c056e75bf3cbdd2a8ec36e22262783112fce9..e20eb95429a8233528fc93508b6bdd0b8ce3bc24 100644 (file)
--- a/arch/powerpc/include/asm/irqflags.h
+++ b/arch/powerpc/include/asm/irqflags.h
@@ -20,9 +20,9 @@
  */
 #define TRACE_WITH_FRAME_BUFFER(func)          \
        mflr    r0;                             \
-       stdu    r1, -32(r1);                    \
+       stdu    r1, -STACK_FRAME_OVERHEAD(r1);  \
        std     r0, 16(r1);                     \
-       stdu    r1, -32(r1);                    \
+       stdu    r1, -STACK_FRAME_OVERHEAD(r1);  \
        bl func;                                \
        ld      r1, 0(r1);                      \
        ld      r1, 0(r1);