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authorHeiko Carstens <heiko.carstens@de.ibm.com>2013-05-13 14:48:52 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2013-05-15 13:09:09 +0200
commitaca91209775514b5a335e7ef11f1d636618590c7 (patch)
treed2bc7248e2a4451e0a68c1680106770ad64874eb /arch/s390/include
parentbb4b42ce0ca36af8c113587ab64b138b3cf5459c (diff)
downloadop-kernel-dev-aca91209775514b5a335e7ef11f1d636618590c7.zip
op-kernel-dev-aca91209775514b5a335e7ef11f1d636618590c7.tar.gz
s390/ftrace: fix mcount adjustment
Tony Jones reported that the ftrace self tests on s390 do not work: <6>Testing dynamic ftrace ops #1: (0 0 0 0 0) FAILED! <6>Testing tracer irqsoff: <3>failed to start irqsoff tracer <4>.. no entries found ..FAILED! <6>Testing tracer wakeup: <3>failed to start wakeup tracer <4>.. no entries found ..FAILED! <6>Testing tracer function_graph: <4>Failed to init function_graph tracer, init returned -19 <4>FAILED! This happens because we forgot to adjust the instruction pointer that gets passed to the ftrace trace function by MCOUNT_INSN_SIZE. In addition change MCOUNT_INSN_SIZE to the correct value on 31 bit. It only worked so far because the to be patched instruction was identical. Reported-by: Tony Jones <tonyj@suse.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include')
-rw-r--r--arch/s390/include/asm/ftrace.h12
1 files changed, 7 insertions, 5 deletions
diff --git a/arch/s390/include/asm/ftrace.h b/arch/s390/include/asm/ftrace.h
index b7931fa..bf246da 100644
--- a/arch/s390/include/asm/ftrace.h
+++ b/arch/s390/include/asm/ftrace.h
@@ -9,11 +9,6 @@ struct dyn_arch_ftrace { };
#define MCOUNT_ADDR ((long)_mcount)
-#ifdef CONFIG_64BIT
-#define MCOUNT_INSN_SIZE 12
-#else
-#define MCOUNT_INSN_SIZE 20
-#endif
static inline unsigned long ftrace_call_adjust(unsigned long addr)
{
@@ -21,4 +16,11 @@ static inline unsigned long ftrace_call_adjust(unsigned long addr)
}
#endif /* __ASSEMBLY__ */
+
+#ifdef CONFIG_64BIT
+#define MCOUNT_INSN_SIZE 12
+#else
+#define MCOUNT_INSN_SIZE 22
+#endif
+
#endif /* _ASM_S390_FTRACE_H */
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