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sched/deadline: Don't use dubious signed bitfields 

It doesn't cause a run-time bug, but these bitfields should be unsigned.
When it's signed ->dl_throttled is set to either 0 or -1, instead of
0 and 1 as expected.

The sched.h file is included into tons of places so Sparse generates
a flood of warnings like this:

  ./include/linux/sched.h:477:54: error: dubious one-bit signed bitfield

Reported-by: Matthew Wilcox <willy@infradead.org>
Reported-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Luca Abeni <luca.abeni@santannapisa.it>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: kernel-janitors@vger.kernel.org
Cc: luca abeni <luca.abeni@santannapisa.it>
Link: http://lkml.kernel.org/r/20171013070121.dzcncojuj2f4utij@mwanda
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Dan Carpenter 2017-10-13 10:01:22 +03:00 committed by Ingo Molnar
parent 5c0342ca7e
commit aa5222e92f
1 changed files with 4 additions and 4 deletions
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8
include/linux/sched.h
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@ -473,10 +473,10 @@ struct sched_dl_entity {
* conditions between the inactive timer handler and the wakeup * conditions between the inactive timer handler and the wakeup
* code. * code.
*/ */
int dl_throttled : 1; unsigned int dl_throttled : 1;
int dl_boosted : 1; unsigned int dl_boosted : 1;
int dl_yielded : 1; unsigned int dl_yielded : 1;
int dl_non_contending : 1; unsigned int dl_non_contending : 1;
/* /*
* Bandwidth enforcement timer. Each -deadline task has its * Bandwidth enforcement timer. Each -deadline task has its