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Date: Mon, 19 May 2008 12:40:37 -0500 From: Matt Mackall <mpm@...enic.com> To: MinChan Kim <minchan.kim@...il.com> Cc: linux-kernel@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org, Pekka J Enberg <penberg@...helsinki.fi> Subject: Re: [PATCH] Fix to return wrong pointer in slob On Mon, 2008-05-19 at 22:12 +0900, MinChan Kim wrote: > Although slob_alloc return NULL, __kmalloc_node returns NULL + align. > Because align always can be changed, it is very hard for debugging > problem of no page if it don't return NULL. > > We have to return NULL in case of no page. > > Signed-off-by: MinChan Kim <minchan.kim@...il.com> > --- > mm/slob.c | 9 ++++++--- > 1 files changed, 6 insertions(+), 3 deletions(-) > > diff --git a/mm/slob.c b/mm/slob.c > index 6038cba..258d76d 100644 > --- a/mm/slob.c > +++ b/mm/slob.c > @@ -469,9 +469,12 @@ void *__kmalloc_node(size_t size, gfp_t gfp, int node) > return ZERO_SIZE_PTR; > > m = slob_alloc(size + align, gfp, align, node); > - if (m) > - *m = size; > - return (void *)m + align; > + if (!m) > + return NULL; > + else { > + *m = size; > + return (void *)m + align; > + } This looks good, but I would remove the 'else {' and '}' here. It's nice to have the 'normal path' minimally indented. Otherwise, Acked-by: Matt Mackall <mpm@...enic.com> [cc:ed to Pekka, who manages the allocator tree] > } else { > void *ret; > -- Mathematics is the supreme nostalgia of our time. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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