linux-kernel - Re: [PATCH v2 1/1] drivers/base: Remove unnecessary OOM message

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Date:	Mon, 9 Feb 2015 08:56:35 -0600
From:	Nishanth Menon <nm@...com>
To:	Quentin Lambert <lambert.quentin@...il.com>
Cc:	Ming Lei <ming.lei@...onical.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	kernel-janitors@...r.kernel.org,
	lkml <linux-kernel@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>
Subject: Re: [PATCH v2 1/1] drivers/base: Remove unnecessary OOM message

On Mon, Feb 9, 2015 at 3:45 AM, Quentin Lambert
<lambert.quentin@...il.com> wrote:
> This patch reduces the kernel size by removing error messages that duplicate
> the normal OOM message.
>
> A simplified version of the semantic patch that finds this problem is as
> follows: (http://coccinelle.lip6.fr)
>
> @@
> identifier f,print,l;
> expression e;
> constant char[] c;
> @@
>
> e = \(kzalloc\|kmalloc\|devm_kzalloc\|devm_kmalloc\)(...);
> if (e == NULL) {
>   <+...
> -  print(...,c,...);
>   ... when any
> (
>   goto l;
> |
>   return ...;
> )
>   ...+> }
>
> Signed-off-by: Quentin Lambert <lambert.quentin@...il.com>
> ---
>  This post http://lwn.net/Articles/627419/ points out that the messages
>  will not be printed anyway. That being said it also explains that introducing
>  a low-order memory-allocation failures would result in a better kernel.
>  Although it is unlikely to change, I wasn't sure whether or not it should be
>  mentionned in the commit message.
>
>
>  drivers/base/firmware_class.c  | 1 -
>  drivers/base/power/clock_ops.c | 4 +---
>  drivers/base/power/opp.c       | 8 ++------

^^ for OPP:
Acked-by: Nishanth Menon <nm@...com>

>  3 files changed, 3 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
> index 58470c3..c3293f0 100644
> --- a/drivers/base/firmware_class.c
> +++ b/drivers/base/firmware_class.c
> @@ -855,7 +855,6 @@ fw_create_instance(struct firmware *firmware, const char *fw_name,
>
>         fw_priv = kzalloc(sizeof(*fw_priv), GFP_KERNEL);
>         if (!fw_priv) {
> -               dev_err(device, "%s: kmalloc failed\n", __func__);
>                 fw_priv = ERR_PTR(-ENOMEM);
>                 goto exit;
>         }
> diff --git a/drivers/base/power/clock_ops.c b/drivers/base/power/clock_ops.c
> index d626576..7fdd017 100644
> --- a/drivers/base/power/clock_ops.c
> +++ b/drivers/base/power/clock_ops.c
> @@ -81,10 +81,8 @@ static int __pm_clk_add(struct device *dev, const char *con_id,
>                 return -EINVAL;
>
>         ce = kzalloc(sizeof(*ce), GFP_KERNEL);
> -       if (!ce) {
> -               dev_err(dev, "Not enough memory for clock entry.\n");
> +       if (!ce)
>                 return -ENOMEM;
> -       }
>
>         if (con_id) {
>                 ce->con_id = kstrdup(con_id, GFP_KERNEL);
> diff --git a/drivers/base/power/opp.c b/drivers/base/power/opp.c
> index 15bf299..677fb28 100644
> --- a/drivers/base/power/opp.c
> +++ b/drivers/base/power/opp.c
> @@ -474,10 +474,8 @@ static int _opp_add_dynamic(struct device *dev, unsigned long freq,
>
>         /* allocate new OPP node */
>         new_opp = kzalloc(sizeof(*new_opp), GFP_KERNEL);
> -       if (!new_opp) {
> -               dev_warn(dev, "%s: Unable to create new OPP node\n", __func__);
> +       if (!new_opp)
>                 return -ENOMEM;
> -       }
>
>         /* Hold our list modification lock here */
>         mutex_lock(&dev_opp_list_lock);
> @@ -695,10 +693,8 @@ static int _opp_set_availability(struct device *dev, unsigned long freq,
>
>         /* keep the node allocated */
>         new_opp = kmalloc(sizeof(*new_opp), GFP_KERNEL);
> -       if (!new_opp) {
> -               dev_warn(dev, "%s: Unable to create OPP\n", __func__);
> +       if (!new_opp)
>                 return -ENOMEM;
> -       }
>
>         mutex_lock(&dev_opp_list_lock);
>
> --
> 1.9.1
>
> --
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-- 
---
Regards,
Nishanth Menon
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