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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
commit f1b2f2bd58
3 changed files with 4 additions and 14 deletions
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3
arch/x86/kernel/ftrace.c
View file

@ -366,7 +366,6 @@ static int add_breakpoints(struct dyn_ftrace *rec, int enable)
/* converting nop to call */
return add_brk_on_nop(rec);
case FTRACE_UPDATE_MODIFY_CALL_REGS:
case FTRACE_UPDATE_MODIFY_CALL:
case FTRACE_UPDATE_MAKE_NOP:
/* converting a call to a nop */
@ -469,7 +468,6 @@ static int add_update(struct dyn_ftrace *rec, int enable)
case FTRACE_UPDATE_IGNORE:
return 0;
case FTRACE_UPDATE_MODIFY_CALL_REGS:
case FTRACE_UPDATE_MODIFY_CALL:
case FTRACE_UPDATE_MAKE_CALL:
/* converting nop to call */
@ -516,7 +514,6 @@ static int finish_update(struct dyn_ftrace *rec, int enable)
case FTRACE_UPDATE_IGNORE:
return 0;
case FTRACE_UPDATE_MODIFY_CALL_REGS:
case FTRACE_UPDATE_MODIFY_CALL:
case FTRACE_UPDATE_MAKE_CALL:
/* converting nop to call */

2
include/linux/ftrace.h
View file

@ -362,14 +362,12 @@ enum {
* IGNORE - The function is already what we want it to be
* MAKE_CALL - Start tracing the function
* MODIFY_CALL - Stop saving regs for the function
* MODIFY_CALL_REGS - Start saving regs for the function
* MAKE_NOP - Stop tracing the function
*/
enum {
FTRACE_UPDATE_IGNORE,
FTRACE_UPDATE_MAKE_CALL,
FTRACE_UPDATE_MODIFY_CALL,
FTRACE_UPDATE_MODIFY_CALL_REGS,
FTRACE_UPDATE_MAKE_NOP,
};

11
kernel/trace/ftrace.c
View file

@ -1701,18 +1701,14 @@ 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;
}
@ -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);
}