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ftrace/x86: mcount offset calculation

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Do the mcount offset adjustment in the recordmcount.pl/recordmcount.[ch]
at compile time and not in ftrace_call_adjust at run time.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Martin Schwidefsky
2011-05-10 10:10:41 +02:00
committed by Steven Rostedt
parent 07d8b595f3
commit 521ccb5c4a
3 changed files with 7 additions and 4 deletions
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7
arch/x86/include/asm/ftrace.h
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@ -38,11 +38,10 @@ extern void mcount(void);
static inline unsigned long ftrace_call_adjust(unsigned long addr)
{
/*
* call mcount is "e8 <4 byte offset>"
* The addr points to the 4 byte offset and the caller of this
* function wants the pointer to e8. Simply subtract one.
* addr is the address of the mcount call instruction.
* recordmcount does the necessary offset calculation.
*/
return addr - 1;
return addr;
}
#ifdef CONFIG_DYNAMIC_FTRACE