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Subject[tip:sched/core] sched/wait: Make the signal_pending() checks consistent
Commit-ID:  2f2a2b60adf368bacd6acd2116c01e32caf936c4
Gitweb: http://git.kernel.org/tip/2f2a2b60adf368bacd6acd2116c01e32caf936c4
Author: Peter Zijlstra <peterz@infradead.org>
AuthorDate: Wed, 2 Oct 2013 11:22:18 +0200
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Fri, 4 Oct 2013 10:14:44 +0200

sched/wait: Make the signal_pending() checks consistent

There's two patterns to check signals in the __wait_event*() macros:

if (!signal_pending(current)) {
schedule();
continue;
}
ret = -ERESTARTSYS;
break;

And the more natural:

if (signal_pending(current)) {
ret = -ERESTARTSYS;
break;
}
schedule();

Change them all into the latter form.

Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20131002092527.956416254@infradead.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
include/linux/tty.h | 13 ++++++-------
include/linux/wait.h | 35 ++++++++++++++++-------------------
2 files changed, 22 insertions(+), 26 deletions(-)

diff --git a/include/linux/tty.h b/include/linux/tty.h
index 64f8646..0503729 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -686,14 +686,13 @@ do { \
prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE); \
if (condition) \
break; \
- if (!signal_pending(current)) { \
- tty_unlock(tty); \
- schedule(); \
- tty_lock(tty); \
- continue; \
+ if (signal_pending(current)) { \
+ ret = -ERESTARTSYS; \
+ break; \
} \
- ret = -ERESTARTSYS; \
- break; \
+ tty_unlock(tty); \
+ schedule(); \
+ tty_lock(tty); \
} \
finish_wait(&wq, &__wait); \
} while (0)
diff --git a/include/linux/wait.h b/include/linux/wait.h
index a67fc16..ccf0c52 100644
--- a/include/linux/wait.h
+++ b/include/linux/wait.h
@@ -261,12 +261,11 @@ do { \
prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE); \
if (condition) \
break; \
- if (!signal_pending(current)) { \
- schedule(); \
- continue; \
+ if (signal_pending(current)) { \
+ ret = -ERESTARTSYS; \
+ break; \
} \
- ret = -ERESTARTSYS; \
- break; \
+ schedule(); \
} \
finish_wait(&wq, &__wait); \
} while (0)
@@ -302,14 +301,13 @@ do { \
prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE); \
if (condition) \
break; \
- if (!signal_pending(current)) { \
- ret = schedule_timeout(ret); \
- if (!ret) \
- break; \
- continue; \
+ if (signal_pending(current)) { \
+ ret = -ERESTARTSYS; \
+ break; \
} \
- ret = -ERESTARTSYS; \
- break; \
+ ret = schedule_timeout(ret); \
+ if (!ret) \
+ break; \
} \
if (!ret && (condition)) \
ret = 1; \
@@ -439,14 +437,13 @@ do { \
finish_wait(&wq, &__wait); \
break; \
} \
- if (!signal_pending(current)) { \
- schedule(); \
- continue; \
- } \
- ret = -ERESTARTSYS; \
- abort_exclusive_wait(&wq, &__wait, \
+ if (signal_pending(current)) { \
+ ret = -ERESTARTSYS; \
+ abort_exclusive_wait(&wq, &__wait, \
TASK_INTERRUPTIBLE, NULL); \
- break; \
+ break; \
+ } \
+ schedule(); \
} \
} while (0)


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