The patch titled
Subject: mm: slab: clarify krealloc()'s behavior with __GFP_ZERO
has been added to the -mm tree. Its filename is
mm-slab-clarify-kreallocs-behavior-with-__gfp_zero.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-slab-clarify-kreallocs-behavior-with-__gfp_zero.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-slab-clarify-kreallocs-behavior-with-__gfp_zero.patch
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------------------------------------------------------
From: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
Subject: mm: slab: clarify krealloc()'s behavior with __GFP_ZERO
Patch series "slab: provide and use krealloc_array()", v3.
Andy brought to my attention the fact that users allocating an array of
equally sized elements should check if the size multiplication doesn't
overflow. This is why we have helpers like kmalloc_array().
However we don't have krealloc_array() equivalent and there are many users
who do their own multiplication when calling krealloc() for arrays.
This series provides krealloc_array() and uses it in a couple places.
A separate series will follow adding devm_krealloc_array() which is needed
in the xilinx adc driver.
This patch (of 9):
__GFP_ZERO is ignored by krealloc() (unless we fall-back to kmalloc()
path, in which case it's honored). Point that out in the kerneldoc.
Link: https://lkml.kernel.org/r/20201109110654.12547-1-brgl@xxxxxxxx
Link: https://lkml.kernel.org/r/20201109110654.12547-2-brgl@xxxxxxxx
Signed-off-by: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
Cc: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Cc: Sumit Semwal <sumit.semwal@xxxxxxxxxx>
Cc: Gustavo Padovan <gustavo@xxxxxxxxxxx>
Cc: Christian Knig <christian.koenig@xxxxxxx>
Cc: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: James Morse <james.morse@xxxxxxx>
Cc: Robert Richter <rric@xxxxxxxxxx>
Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Cc: Maxime Ripard <mripard@xxxxxxxxxx>
Cc: Thomas Zimmermann <tzimmermann@xxxxxxx>
Cc: David Airlie <airlied@xxxxxxxx>
Cc: Daniel Vetter <daniel@xxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Linus Walleij <linus.walleij@xxxxxxxxxx>
Cc: "Michael S . Tsirkin" <mst@xxxxxxxxxx>
Cc: Jason Wang <jasowang@xxxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Jaroslav Kysela <perex@xxxxxxxx>
Cc: Takashi Iwai <tiwai@xxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: Takashi Iwai <tiwai@xxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/slab_common.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/mm/slab_common.c~mm-slab-clarify-kreallocs-behavior-with-__gfp_zero
+++ a/mm/slab_common.c
@@ -1091,9 +1091,9 @@ static __always_inline void *__do_kreall
* @flags: the type of memory to allocate.
*
* The contents of the object pointed to are preserved up to the
- * lesser of the new and old sizes. If @p is %NULL, krealloc()
- * behaves exactly like kmalloc(). If @new_size is 0 and @p is not a
- * %NULL pointer, the object pointed to is freed.
+ * lesser of the new and old sizes (__GFP_ZERO flag is effectively ignored).
+ * If @p is %NULL, krealloc() behaves exactly like kmalloc(). If @new_size
+ * is 0 and @p is not a %NULL pointer, the object pointed to is freed.
*
* Return: pointer to the allocated memory or %NULL in case of error
*/
_
Patches currently in -mm which might be from bgolaszewski@xxxxxxxxxxxx are
mm-slab-clarify-kreallocs-behavior-with-__gfp_zero.patch
mm-slab-provide-krealloc_array.patch
alsa-pcm-use-krealloc_array.patch
vhost-vringh-use-krealloc_array.patch
pinctrl-use-krealloc_array.patch
edac-ghes-use-krealloc_array.patch
drm-atomic-use-krealloc_array.patch
hwtracing-intel-use-krealloc_array.patch
dma-buf-use-krealloc_array.patch
