[patch 084/166] mm/zsmalloc: add missing annotation for pin_tag()

Andrew Morton
2020-04-07T03:08:30Z

From: Jules Irenge <jbi.octave@gmail.com>
Subject: mm/zsmalloc: add missing annotation for pin_tag()

Sparse reports a warning at pin_tag()()

warning: context imbalance in pin_tag() - wrong count at exit

The root cause is the missing annotation at pin_tag()
Add the missing __acquires(bitlock) annotation

Link: http://lkml.kernel.org/r/20200214204741.94112-13-jbi.octave@gmail.com
Signed-off-by: Jules Irenge <jbi.octave@gmail.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

mm/zsmalloc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/zsmalloc.c~mm-zsmalloc-add-missing-annotation-for-pin_tag
+++ a/mm/zsmalloc.c
@@ -891,7 +891,7 @@ static inline int trypin_tag(unsigned lo
return bit_spin_trylock(HANDLE_PIN_BIT, (unsigned long *)handle);
}

-static void pin_tag(unsigned long handle)
+static void pin_tag(unsigned long handle) __acquires(bitlock)
{
bit_spin_lock(HANDLE_PIN_BIT, (unsigned long *)handle);
}
_