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tracing/function-graph: x86_64 stack allocation cleanup 

Only 24 bytes needs to be reserved on the stack for the function graph
tracer on x86_64.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
LKML-Reference: <20090729085837.GB4998@jolsa.lab.eng.brq.redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Jiri Olsa 2009-07-29 10:58:37 +02:00 committed by Steven Rostedt
parent 4b3b4c5e64
commit 4818d80942
1 changed files with 3 additions and 3 deletions
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6
arch/x86/kernel/entry_64.S
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@ -146,7 +146,7 @@ ENTRY(ftrace_graph_caller)
END(ftrace_graph_caller) END(ftrace_graph_caller)
GLOBAL(return_to_handler) GLOBAL(return_to_handler)
subq $80, %rsp subq $24, %rsp
/* Save the return values */ /* Save the return values */
movq %rax, (%rsp) movq %rax, (%rsp)
@ -155,10 +155,10 @@ GLOBAL(return_to_handler)
call ftrace_return_to_handler call ftrace_return_to_handler
movq %rax, 72(%rsp) movq %rax, 16(%rsp)
movq 8(%rsp), %rdx movq 8(%rsp), %rdx
movq (%rsp), %rax movq (%rsp), %rax
addq $72, %rsp addq $16, %rsp
retq retq
#endif #endif