leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

rcu: Turn off tracing before dumping trace

Browse Source 
Currently, RCU allows tracing to continue when it automatically does
ftrace_dump() after detecting an error condition, which can result in
excessively large traces and lost trace events.  This commit therefore
does a tracing_off() before any of these ftrace_dump() calls.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney
2017-08-31 16:47:08 -07:00
parent 9b9500da81
commit 83b6ca1fed
1 changed files with 3 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
kernel/rcu/rcu.h
View File

@@ -220,8 +220,10 @@ do { \
static atomic_t ___rfd_beenhere = ATOMIC_INIT(0); \ static atomic_t ___rfd_beenhere = ATOMIC_INIT(0); \
\ \
if (!atomic_read(&___rfd_beenhere) && \ if (!atomic_read(&___rfd_beenhere) && \
!atomic_xchg(&___rfd_beenhere, 1)) \ !atomic_xchg(&___rfd_beenhere, 1)) { \
tracing_off(); \
ftrace_dump(oops_dump_mode); \ ftrace_dump(oops_dump_mode); \
} \
} while (0) } while (0)
void rcu_early_boot_tests(void); void rcu_early_boot_tests(void);