From e21827aadd77e33833eeb393de2e8675e9b399e2 Mon Sep 17 00:00:00 2001 From: Ezequiel Garcia Date: Tue, 14 Aug 2012 09:55:21 -0300 Subject: [PATCH] mm: Use __do_krealloc to do the krealloc job Without this patch we can get (many) kmem trace events with call site at krealloc(). This happens because krealloc is calling __krealloc, which performs the allocation through kmalloc_track_caller. Since neither krealloc nor __krealloc are marked inline explicitly, the caller can be traced as being krealloc, which clearly is not the intended behavior. This patch allows to get the real caller of krealloc, by creating an always inlined function __do_krealloc, thus tracing the call site accurately. Acked-by: Christoph Lameter Cc: Glauber Costa Signed-off-by: Ezequiel Garcia Signed-off-by: Pekka Enberg --- mm/util.c | 35 +++++++++++++++++++++-------------- 1 file changed, 21 insertions(+), 14 deletions(-) diff --git a/mm/util.c b/mm/util.c index 8c7265afa29f..dc3036cdcc6a 100644 --- a/mm/util.c +++ b/mm/util.c @@ -105,6 +105,25 @@ void *memdup_user(const void __user *src, size_t len) } EXPORT_SYMBOL(memdup_user); +static __always_inline void *__do_krealloc(const void *p, size_t new_size, + gfp_t flags) +{ + void *ret; + size_t ks = 0; + + if (p) + ks = ksize(p); + + if (ks >= new_size) + return (void *)p; + + ret = kmalloc_track_caller(new_size, flags); + if (ret && p) + memcpy(ret, p, ks); + + return ret; +} + /** * __krealloc - like krealloc() but don't free @p. * @p: object to reallocate memory for. @@ -117,23 +136,11 @@ EXPORT_SYMBOL(memdup_user); */ void *__krealloc(const void *p, size_t new_size, gfp_t flags) { - void *ret; - size_t ks = 0; - if (unlikely(!new_size)) return ZERO_SIZE_PTR; - if (p) - ks = ksize(p); + return __do_krealloc(p, new_size, flags); - if (ks >= new_size) - return (void *)p; - - ret = kmalloc_track_caller(new_size, flags); - if (ret && p) - memcpy(ret, p, ks); - - return ret; } EXPORT_SYMBOL(__krealloc); @@ -157,7 +164,7 @@ void *krealloc(const void *p, size_t new_size, gfp_t flags) return ZERO_SIZE_PTR; } - ret = __krealloc(p, new_size, flags); + ret = __do_krealloc(p, new_size, flags); if (ret && p != ret) kfree(p); -- GitLab