Techwizz/kernel-fxtec-pro1x
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

ftrace/x86: Get the current mcount addr for add_breakpoint()

Browse source 
The add_breakpoint() code in the ftrace updating gets the address
of what the call will become, but if the mcount address is changing
from regs to non-regs ftrace_caller or vice versa, it will use what
the record currently is.

This is rather silly as the code should always use what is currently
there regardless of if it's changing the regs function or just converting
to a nop.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2014-05-06 16:26:39 -04:00 committed by Steven Rostedt
parent 68f40969f0
commit 94792ea07c
1 changed files with 2 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
arch/x86/kernel/ftrace.c
View file

@ -380,9 +380,9 @@ static int add_breakpoints(struct dyn_ftrace *rec, int enable)
unsigned long ftrace_addr;
int ret;
ret = ftrace_test_record(rec, enable);
ftrace_addr = get_ftrace_old_addr(rec);
ftrace_addr = get_ftrace_addr(rec);
ret = ftrace_test_record(rec, enable);
switch (ret) {
case FTRACE_UPDATE_IGNORE:
@ -394,8 +394,6 @@ static int add_breakpoints(struct dyn_ftrace *rec, int enable)
case FTRACE_UPDATE_MODIFY_CALL_REGS:
case FTRACE_UPDATE_MODIFY_CALL:
ftrace_addr = get_ftrace_old_addr(rec);
/* fall through */
case FTRACE_UPDATE_MAKE_NOP:
/* converting a call to a nop */
return add_brk_on_call(rec, ftrace_addr);