From: Souptick Joarder <jrdr.linux@gmail.com>
To: Nicholas Mc Guire <hofrat@osadl.org>
Cc: Kalle Valo <kvalo@codeaurora.org>,
Eliad Peller <eliad@wizery.com>,
Johannes Berg <johannes.berg@intel.com>,
Arik Nemtsov <arik@wizery.com>, Tony Lindgren <tony@atomide.com>,
Luciano Coelho <luca@coelho.fi>,
Eyal Reizer <eyalreizer@gmail.com>,
Emmanuel Grumbach <emmanuel.grumbach@intel.com>,
linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] wlcore: consolidate kmalloc + memset 0 into kzalloc
Date: Tue, 22 Dec 2015 12:36:43 +0530 [thread overview]
Message-ID: <CAFqt6zaYfbLqUDjcJ36TKMCXpy5_swjZQDj_75topDsMtfBRFA@mail.gmail.com> (raw)
In-Reply-To: <1450716464-20759-1-git-send-email-hofrat@osadl.org>
On Mon, Dec 21, 2015 at 10:17 PM, Nicholas Mc Guire <hofrat@osadl.org> wrote:
> This is an API consolidation only. The use of kmalloc + memset to 0
> is equivalent to kzalloc.
>
> Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
> ---
>
> Found by coccinelle script (relaxed version of
> scripts/coccinelle/api/alloc/kzalloc-simple.cocci)
>
> Patch was compile tested with: x86_64_defconfig +
> CONFIG_WL12XX=m (implies CONFIG_WLCORE=m)
>
> Patch is against linux-next (localversion-next is -next-20151221)
>
> drivers/net/wireless/ti/wlcore/main.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/net/wireless/ti/wlcore/main.c b/drivers/net/wireless/ti/wlcore/main.c
> index ec7f6af..dfc49bf 100644
> --- a/drivers/net/wireless/ti/wlcore/main.c
> +++ b/drivers/net/wireless/ti/wlcore/main.c
> @@ -838,7 +838,7 @@ static void wl12xx_read_fwlog_panic(struct wl1271 *wl)
>
> wl1271_info("Reading FW panic log");
>
> - block = kmalloc(wl->fw_mem_block_size, GFP_KERNEL);
> + block = kzalloc(wl->fw_mem_block_size, GFP_KERNEL);
> if (!block)
> return;
>
> @@ -885,7 +885,6 @@ static void wl12xx_read_fwlog_panic(struct wl1271 *wl)
> goto out;
> }
>
> - memset(block, 0, wl->fw_mem_block_size);
Current code is reseting the block value to 0 in each iterations and
perform some operations.
But if you are using kzalloc as mentioned above it will memset 0 to
block pointer only once.
So both are not equivalent operations.
> ret = wlcore_read_hwaddr(wl, addr, block,
> wl->fw_mem_block_size, false);
>
> --
> 2.1.4
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-wireless" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
-Souptick
prev parent reply other threads:[~2015-12-22 7:06 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-21 16:47 [PATCH] wlcore: consolidate kmalloc + memset 0 into kzalloc Nicholas Mc Guire
2015-12-21 22:56 ` Julian Calaby
2015-12-22 7:29 ` Nicholas Mc Guire
2015-12-22 7:52 ` Julian Calaby
2015-12-22 7:06 ` Souptick Joarder [this message]
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