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tools/lib/lockdep: Fix 'unused value' warnings

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liblockdep defines various macros that may expand to an expression
with no effect, while the in-kernel definition does have an effect.
This results in warnings from gcc when -Wunused-value is enabled, and
is is enabled by -Wall.  Fix this by introducing trivial functions,
as function return values are generally allowed to be ignored.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: a.p.zijlstra@chello.nl
Link: http://lkml.kernel.org/r/20170525130005.5947-6-alexander.levin@verizon.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ben Hutchings 2017-05-25 12:58:37 +00:00 committed by Ingo Molnar
parent db8f7796c4
commit bb7ea2a9af
3 changed files with 15 additions and 5 deletions
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2
tools/lib/lockdep/uinclude/linux/debug_locks.h
View File

@ -4,7 +4,7 @@
#include <stddef.h>
#include <linux/compiler.h>
#define DEBUG_LOCKS_WARN_ON(x) (x)
#define DEBUG_LOCKS_WARN_ON(x) WARN_ON(x)
extern bool debug_locks;
extern bool debug_locks_silent;

12
tools/lib/lockdep/uinclude/linux/kernel.h
View File

@ -22,10 +22,16 @@
_max1 > _max2 ? _max1 : _max2; })
#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
#define WARN_ON(x) (x)
#define WARN_ON_ONCE(x) (x)
static inline int lockdep_warn(int condition)
{
return condition;
}
#define WARN_ON(x) lockdep_warn(x)
#define WARN_ON_ONCE(x) WARN_ON(x)
#define WARN(x, y...) WARN_ON(x)
#define likely(x) (x)
#define WARN(x, y...) (x)
#define uninitialized_var(x) x
#define __init
#define noinline

6
tools/lib/lockdep/uinclude/linux/lockdep.h
View File

@ -29,7 +29,11 @@ extern struct task_struct *__curr(void);
#define current (__curr())
#define debug_locks_off() 1
static inline int debug_locks_off(void)
{
return 1;
}
#define task_pid_nr(tsk) ((tsk)->pid)
#define KSYM_NAME_LEN 128