linux-kernel - [PATCH v3 1/9] mm: slab: clarify krealloc()'s behavior with __GFP

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Message-Id: <20201109110654.12547-2-brgl@bgdev.pl>
Date:   Mon,  9 Nov 2020 12:06:46 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Gustavo Padovan <gustavo@...ovan.org>,
        Christian König <christian.koenig@....com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Tony Luck <tony.luck@...el.com>,
        James Morse <james.morse@....com>,
        Robert Richter <rric@...nel.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
Cc:     linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linaro-mm-sig@...ts.linaro.org, linux-kernel@...r.kernel.org,
        linux-edac@...r.kernel.org, linux-gpio@...r.kernel.org,
        kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-mm@...ck.org,
        alsa-devel@...a-project.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: [PATCH v3 1/9] mm: slab: clarify krealloc()'s behavior with __GFP_ZERO

From: Bartosz Golaszewski <bgolaszewski@...libre.com>

__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.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
---
 mm/slab_common.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/slab_common.c b/mm/slab_common.c
index f9ccd5dc13f3..d6df73f79204 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -1091,9 +1091,9 @@ static __always_inline void *__do_krealloc(const void *p, size_t new_size,
  * @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
  */
-- 
2.29.1