From 2121db74ba0fd2259f0e2265511684fadda9ac49 Mon Sep 17 00:00:00 2001 From: Pekka Enberg Date: Wed, 25 Mar 2009 11:05:57 +0200 Subject: kmemtrace: trace kfree() calls with NULL or zero-length objects Impact: also output kfree(NULL) entries This patch moves the trace_kfree() calls before the ZERO_OR_NULL_PTR check so that we can trace call-sites that call kfree() with NULL many times which might be an indication of a bug. Signed-off-by: Pekka Enberg Cc: Eduard - Gabriel Munteanu LKML-Reference: <1237971957.30175.18.camel@penberg-laptop> Signed-off-by: Ingo Molnar --- mm/slab.c | 4 ++-- mm/slob.c | 4 ++-- mm/slub.c | 4 ++-- 3 files changed, 6 insertions(+), 6 deletions(-) diff --git a/mm/slab.c b/mm/slab.c index fa00fd6..b584002 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -3773,6 +3773,8 @@ void kfree(const void *objp) struct kmem_cache *c; unsigned long flags; + trace_kfree(_RET_IP_, objp); + if (unlikely(ZERO_OR_NULL_PTR(objp))) return; local_irq_save(flags); @@ -3782,8 +3784,6 @@ void kfree(const void *objp) debug_check_no_obj_freed(objp, obj_size(c)); __cache_free(c, (void *)objp); local_irq_restore(flags); - - trace_kfree(_RET_IP_, objp); } EXPORT_SYMBOL(kfree); diff --git a/mm/slob.c b/mm/slob.c index 0000358..a2d4ab3 100644 --- a/mm/slob.c +++ b/mm/slob.c @@ -514,6 +514,8 @@ void kfree(const void *block) { struct slob_page *sp; + trace_kfree(_RET_IP_, block); + if (unlikely(ZERO_OR_NULL_PTR(block))) return; @@ -524,8 +526,6 @@ void kfree(const void *block) slob_free(m, *m + align); } else put_page(&sp->page); - - trace_kfree(_RET_IP_, block); } EXPORT_SYMBOL(kfree); diff --git a/mm/slub.c b/mm/slub.c index a98078b..7ab54ec 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -2792,6 +2792,8 @@ void kfree(const void *x) struct page *page; void *object = (void *)x; + trace_kfree(_RET_IP_, x); + if (unlikely(ZERO_OR_NULL_PTR(x))) return; @@ -2802,8 +2804,6 @@ void kfree(const void *x) return; } slab_free(page->slab, page, object, _RET_IP_); - - trace_kfree(_RET_IP_, x); } EXPORT_SYMBOL(kfree); -- cgit v1.1