diff options
| author | Rik van Riel <riel@redhat.com> | 2014-05-22 10:54:34 +1000 |
|---|---|---|
| committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2014-05-27 18:24:31 +1000 |
| commit | 474d23601fd6e32d41287a303300db91b338eb09 (patch) | |
| tree | 929ce685f9fb7f7b2720fbfd2d83371f14dce1d7 | |
| parent | 0246b2ed7331aeafabef77b73664dacb2f1f9989 (diff) | |
sysrq,rcu: suppress RCU stall warnings while sysrq runs
Some sysrq handlers can run for a long time, because they dump a lot of
data onto a serial console. Having RCU stall warnings pop up in the
middle of them only makes the problem worse.
This patch temporarily disables RCU stall warnings while a sysrq request
is handled.
Signed-off-by: Rik van Riel <riel@redhat.com>
Suggested-by: Paul McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Madper Xie <cxie@redhat.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Richard Weinberger <richard@nod.at>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
| -rw-r--r-- | drivers/tty/sysrq.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c index 7430e87d7352..454b65898e2c 100644 --- a/drivers/tty/sysrq.c +++ b/drivers/tty/sysrq.c @@ -46,6 +46,7 @@ #include <linux/jiffies.h> #include <linux/syscalls.h> #include <linux/of.h> +#include <linux/rcupdate.h> #include <asm/ptrace.h> #include <asm/irq_regs.h> @@ -511,6 +512,7 @@ void __handle_sysrq(int key, bool check_mask) int orig_log_level; int i; + rcu_sysrq_start(); rcu_read_lock(); /* * Raise the apparent loglevel to maximum so that the sysrq header @@ -554,6 +556,7 @@ void __handle_sysrq(int key, bool check_mask) console_loglevel = orig_log_level; } rcu_read_unlock(); + rcu_sysrq_end(); } void handle_sysrq(int key) |