kybaaz/linux-xiaomi-chiron
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Back in 3.16 the ftrace code was redesigned and cleaned up to remove the

Browse source 
double iteration list (one for registered ftrace ops, and one for
 registered "global" ops), to just use one list. That simplified the code
 but also broke the function tracing filtering on pid.
 
 This updates the code to handle the filtering again with the new logic.
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1
 
 iQEcBAABAgAGBQJVsq1dAAoJEEjnJuOKh9ldfagH/39dixx3tMMElO7pGM9Q3DBE
 WmJuGSOmeZA1O0balnfcV2SgegEGCSEP6sjBtyuYCfgcFDWyIdAvGrMLS/hKTOxR
 pilaqyNQz7CROx1zco9gbu5pGwkSkcAfnqYzOg6IpJ0WHtiyH36GMe2wMu29u2VT
 I7NgSC6ByA82N4pwvgetlUcIDcPTyrkkhGmGPBJGY+diKzeSSo8NlRbv3SNYs0ua
 V072Oumu64RrZBMdn/Sb2pCF2hf6vhTXD6qS4dbpK/Rfnlblqer9SqUIx2kpg603
 yDOmPY7wN9FJ94Te3EeXubLi0LqDJH4iPOndrRn1fYsgMbUpq1BlViF7W7Ajze8=
 =LQ+S
 -----END PGP SIGNATURE-----

Merge tag 'trace-v4.2-rc2-fix3' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

Pull ftrace fix from Steven Rostedt:
 "Back in 3.16 the ftrace code was redesigned and cleaned up to remove
  the double iteration list (one for registered ftrace ops, and one for
  registered "global" ops), to just use one list.  That simplified the
  code but also broke the function tracing filtering on pid.

  This updates the code to handle the filtering again with the new
  logic"

* tag 'trace-v4.2-rc2-fix3' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  ftrace: Fix breakage of set_ftrace_pid
This commit is contained in:
Linus Torvalds 2015-07-25 11:42:54 -07:00
commit 763e326c8b
2 changed files with 37 additions and 18 deletions
Download patch file Download diff file Expand all files Collapse all files

3
include/linux/ftrace.h
View file

@ -116,6 +116,7 @@ ftrace_func_t ftrace_ops_get_func(struct ftrace_ops *ops);
* SAVE_REGS. If another ops with this flag set is already registered
* for any of the functions that this ops will be registered for, then
* this ops will fail to register or set_filter_ip.
* PID - Is affected by set_ftrace_pid (allows filtering on those pids)
*/
enum {
FTRACE_OPS_FL_ENABLED = 1 << 0,
@ -132,6 +133,7 @@ enum {
FTRACE_OPS_FL_MODIFYING = 1 << 11,
FTRACE_OPS_FL_ALLOC_TRAMP = 1 << 12,
FTRACE_OPS_FL_IPMODIFY = 1 << 13,
FTRACE_OPS_FL_PID = 1 << 14,
};
#ifdef CONFIG_DYNAMIC_FTRACE
@ -159,6 +161,7 @@ struct ftrace_ops {
struct ftrace_ops *next;
unsigned long flags;
void *private;
ftrace_func_t saved_func;
int __percpu *disabled;
#ifdef CONFIG_DYNAMIC_FTRACE
int nr_trampolines;