[PATCH] kmemleak: record accurate early log buffer count and report when exceeded

Wang Kai
2015-04-15T11:52:06Z

In log_early function, crt_early_log should also count once when
'crt_early_log >= ARRAY_SIZE(early_log)'. Otherwise the reported
count from kmemleak_init is one less than 'actual number'.

Then, in kmemleak_init, if early_log buffer size equal actual
number, kmemleak will init sucessful, so change warning condition
to 'crt_early_log > ARRAY_SIZE(early_log)'.

Signed-off-by: Wang Kai <morgan.wang@huawei.com>
---
mm/kmemleak.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index 5405aff..49956cf 100644
--- a/mm/kmemleak.c
+++ b/mm/kmemleak.c
@@ -814,6 +814,8 @@ static void __init log_early(int op_type, const void *ptr, size_t size,
}

if (crt_early_log >= ARRAY_SIZE(early_log)) {
+ /* kmemleak will stop recording, just count the requests */
+ crt_early_log++;
kmemleak_disable();
return;
}
@@ -1829,7 +1831,8 @@ void __init kmemleak_init(void)
object_cache = KMEM_CACHE(kmemleak_object, SLAB_NOLEAKTRACE);
scan_area_cache = KMEM_CACHE(kmemleak_scan_area, SLAB_NOLEAKTRACE);

- if (crt_early_log >= ARRAY_SIZE(early_log))
+ /* Don't warning when crt_early_log == ARRAY_SIZE(early_log) */
+ if (crt_early_log > ARRAY_SIZE(early_log))
pr_warning("Early log buffer exceeded (%d), please increase "
"DEBUG_KMEMLEAK_EARLY_LOG_SIZE\n", crt_early_log);

--
1.7.9.5