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ftrace: Remove FTRACE_UPDATE_MODIFY_CALL_REGS flag

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As the decision to what needs to be done (converting a call to the
ftrace_caller to ftrace_caller_regs or to convert from ftrace_caller_regs
to ftrace_caller) can easily be determined from the rec->flags of
FTRACE_FL_REGS and FTRACE_FL_REGS_EN, there's no need to have the
ftrace_check_record() return either a UPDATE_MODIFY_CALL_REGS or a
UPDATE_MODIFY_CALL. Just he latter is enough. This added flag causes
more complexity than is required. Remove it.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat)
2014-05-07 16:09:49 -04:00
committed by Steven Rostedt
parent 7c0868e03b
commit f1b2f2bd58
3 changed files with 4 additions and 14 deletions
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13
kernel/trace/ftrace.c
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@@ -1701,19 +1701,15 @@ static int ftrace_check_record(struct dyn_ftrace *rec, int enable, int update)
/*
* If this record is being updated from a nop, then
* return UPDATE_MAKE_CALL.
* Otherwise, if the EN flag is set, then return
* UPDATE_MODIFY_CALL_REGS to tell the caller to convert
* from the non-save regs, to a save regs function.
* Otherwise,
* return UPDATE_MODIFY_CALL to tell the caller to convert
* from the save regs, to a non-save regs function.
* from the save regs, to a non-save regs function or
* vice versa.
*/
if (flag & FTRACE_FL_ENABLED)
return FTRACE_UPDATE_MAKE_CALL;
else if (rec->flags & FTRACE_FL_REGS_EN)
return FTRACE_UPDATE_MODIFY_CALL_REGS;
else
return FTRACE_UPDATE_MODIFY_CALL;
return FTRACE_UPDATE_MODIFY_CALL;
}
if (update) {
@@ -1815,7 +1811,6 @@ __ftrace_replace_code(struct dyn_ftrace *rec, int enable)
case FTRACE_UPDATE_MAKE_NOP:
return ftrace_make_nop(NULL, rec, ftrace_addr);
case FTRACE_UPDATE_MODIFY_CALL_REGS:
case FTRACE_UPDATE_MODIFY_CALL:
return ftrace_modify_call(rec, ftrace_old_addr, ftrace_addr);
}