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Subject[PATCH 3/4] kmemleak: When the early log buffer is exceeded, report the actual number
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Just telling that the early log buffer has been exceeded doesn't mean
much. This patch moves the error printing to the kmemleak_init()
function and displays the actual calls to the kmemleak API during early
logging.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
---
mm/kmemleak.c | 21 +++++++++++++++------
1 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index 573152e..e6dd17b 100644
--- a/mm/kmemleak.c
+++ b/mm/kmemleak.c
@@ -797,9 +797,13 @@ static void __init log_early(int op_type, const void *ptr, size_t size,
unsigned long flags;
struct early_log *log;

+ if (atomic_read(&kmemleak_error)) {
+ /* kmemleak stopped recording, just count the requests */
+ crt_early_log++;
+ return;
+ }
+
if (crt_early_log >= ARRAY_SIZE(early_log)) {
- pr_warning("Early log buffer exceeded, "
- "please increase DEBUG_KMEMLEAK_EARLY_LOG_SIZE\n");
kmemleak_disable();
return;
}
@@ -1634,7 +1638,6 @@ static void kmemleak_disable(void)
return;

/* stop any memory operation tracing */
- atomic_set(&kmemleak_early_log, 0);
atomic_set(&kmemleak_enabled, 0);

/* check whether it is too early for a kernel thread */
@@ -1694,12 +1697,18 @@ void __init kmemleak_init(void)
scan_area_cache = KMEM_CACHE(kmemleak_scan_area, SLAB_NOLEAKTRACE);
INIT_PRIO_TREE_ROOT(&object_tree_root);

+ 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);
+
/* the kernel is still in UP mode, so disabling the IRQs is enough */
local_irq_save(flags);
- if (!atomic_read(&kmemleak_error)) {
+ atomic_set(&kmemleak_early_log, 0);
+ if (atomic_read(&kmemleak_error)) {
+ local_irq_restore(flags);
+ return;
+ } else
atomic_set(&kmemleak_enabled, 1);
- atomic_set(&kmemleak_early_log, 0);
- }
local_irq_restore(flags);

/*



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