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aca9120977
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>
27 lines
409 B
C
27 lines
409 B
C
#ifndef _ASM_S390_FTRACE_H
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#define _ASM_S390_FTRACE_H
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#ifndef __ASSEMBLY__
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extern void _mcount(void);
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struct dyn_arch_ftrace { };
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#define MCOUNT_ADDR ((long)_mcount)
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static inline unsigned long ftrace_call_adjust(unsigned long addr)
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{
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return addr;
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}
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#endif /* __ASSEMBLY__ */
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#ifdef CONFIG_64BIT
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#define MCOUNT_INSN_SIZE 12
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#else
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#define MCOUNT_INSN_SIZE 22
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#endif
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#endif /* _ASM_S390_FTRACE_H */
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