linux-kernel - Re: [PATCH v2] fs/pstore: Optimization function ramoops_init

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Message-ID: <CAGXu5jJre6wSee2_94EJPt7ffGaKRJXfKsM=f_s96JVX4YT0FA@mail.gmail.com>
Date:	Wed, 18 Mar 2015 13:11:58 -0700
From:	Kees Cook <keescook@...omium.org>
To:	Wang Long <long.wanglong@...wei.com>
Cc:	Anton Vorontsov <anton@...msg.org>,
	Colin Cross <ccross@...roid.com>,
	Tony Luck <tony.luck@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	peifeiyue <peifeiyue@...wei.com>,
	Marco Stornelli <marco.stornelli@...il.com>,
	Anton Vorontsov <anton.vorontsov@...aro.org>,
	Mark Salyzyn <salyzyn@...roid.com>,
	Sergiu Iordache <sergiu@...omium.org>
Subject: Re: [PATCH v2] fs/pstore: Optimization function ramoops_init_przs

On Tue, Mar 17, 2015 at 6:41 PM, Wang Long <long.wanglong@...wei.com> wrote:
> The value of cxt->record_size does not change in the loop,
> so this patch optimize the assign statement by dropping
> sz entirely and using cxt->record_size in its place.
>
> Signed-off-by: Wang Long <long.wanglong@...wei.com>

Thanks!

Acked-by: Kees Cook <keescook@...omium.org>

-Kees

> ---
>  fs/pstore/ram.c | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
>
> diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
> index 44a549b..f29373d 100644
> --- a/fs/pstore/ram.c
> +++ b/fs/pstore/ram.c
> @@ -394,18 +394,16 @@ static int ramoops_init_przs(struct device *dev, struct ramoops_context *cxt,
>         }
>
>         for (i = 0; i < cxt->max_dump_cnt; i++) {
> -               size_t sz = cxt->record_size;
> -
> -               cxt->przs[i] = persistent_ram_new(*paddr, sz, 0,
> +               cxt->przs[i] = persistent_ram_new(*paddr, cxt->record_size, 0,
>                                                   &cxt->ecc_info,
>                                                   cxt->memtype);
>                 if (IS_ERR(cxt->przs[i])) {
>                         err = PTR_ERR(cxt->przs[i]);
>                         dev_err(dev, "failed to request mem region (0x%zx@...llx): %d\n",
> -                               sz, (unsigned long long)*paddr, err);
> +                               cxt->record_size, (unsigned long long)*paddr, err);
>                         goto fail_prz;
>                 }
> -               *paddr += sz;
> +               *paddr += cxt->record_size;
>         }
>
>         return 0;
> --
> 1.8.3.4
>
> --
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-- 
Kees Cook
Chrome OS Security
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