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s390/ftrace: use HAVE_FUNCTION_GRAPH_RET_ADDR_PTR

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Make the call chain more reliable by tagging the ftrace stack entries
with the stack pointer that is associated with the return address.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2019-02-18 16:51:28 +01:00
parent 78c98f9074
commit ec7bf4789d
5 changed files with 11 additions and 8 deletions
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4
arch/s390/kernel/mcount.S
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@@ -65,8 +65,8 @@ ENTRY(ftrace_caller)
.globl ftrace_graph_caller
ftrace_graph_caller:
j ftrace_graph_caller_end
lg %r2,(STACK_PTREGS_GPRS+14*8)(%r15)
lg %r3,(STACK_PTREGS_PSW+8)(%r15)
lmg %r2,%r3,(STACK_PTREGS_GPRS+14*8)(%r15)
lg %r4,(STACK_PTREGS_PSW+8)(%r15)
brasl %r14,prepare_ftrace_return
stg %r2,(STACK_PTREGS_GPRS+14*8)(%r15)
ftrace_graph_caller_end: