linux-kernel - Re: [PATCH v2] lib/string_helpers: Use the given gfp flag when allocating memory

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Date:   Mon, 24 Jan 2022 16:26:22 +0200
From:   Andy Shevchenko <andriy.shevchenko@...el.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     Andy Shevchenko <andy@...nel.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mel Gorman <mgorman@...e.de>, Michal Hocko <mhocko@...e.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH v2] lib/string_helpers: Use the given gfp flag when
 allocating memory

On Sun, Jan 16, 2022 at 01:53:37PM +0100, Christophe JAILLET wrote:
> kstrdup_quotable_cmdline() and kstrdup_quotable_file() are given a gfp flag
> that is passed and used for memory allocation in kstrdup_quotable() just a
> few lines below.
> 
> It looks reasonable to use this gfp value for the buffer allocated and
> freed in these functions as well.

Acked-by: Andy Shevchenko <andriy.shevchenko@...el.com>

> Fixes: 0ee931c4e31a ("mm: treewide: remove GFP_TEMPORARY allocation flag")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
> According to what I've found in 5.16, all callers use GFP_KERNEL, so this
> patch should be a no-op.
> But who knows how it will be used in the future. Better safe than sorry.
> 
> v2: Add the change for kstrdup_quotable_file()
> ---
>  lib/string_helpers.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/lib/string_helpers.c b/lib/string_helpers.c
> index 90f9f1b7afec..4433e486b725 100644
> --- a/lib/string_helpers.c
> +++ b/lib/string_helpers.c
> @@ -624,7 +624,7 @@ char *kstrdup_quotable_cmdline(struct task_struct *task, gfp_t gfp)
>  	char *buffer, *quoted;
>  	int i, res;
>  
> -	buffer = kmalloc(PAGE_SIZE, GFP_KERNEL);
> +	buffer = kmalloc(PAGE_SIZE, gfp);
>  	if (!buffer)
>  		return NULL;
>  
> @@ -660,7 +660,7 @@ char *kstrdup_quotable_file(struct file *file, gfp_t gfp)
>  		return kstrdup("<unknown>", gfp);
>  
>  	/* We add 11 spaces for ' (deleted)' to be appended */
> -	temp = kmalloc(PATH_MAX + 11, GFP_KERNEL);
> +	temp = kmalloc(PATH_MAX + 11, gfp);
>  	if (!temp)
>  		return kstrdup("<no_memory>", gfp);
>  
> -- 
> 2.32.0
> 

-- 
With Best Regards,
Andy Shevchenko