linux-kernel - Re: [PATCH] mm/zswap: change params from hidden to ro

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20131120173347.GA2369@hp530>
Date:	Wed, 20 Nov 2013 18:33:50 +0100
From:	Vladimir Murzin <murzin.v@...il.com>
To:	Dan Streetman <ddstreet@...e.org>
Cc:	linux-mm@...ck.org, Seth Jennings <sjennings@...iantweb.net>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Bob Liu <bob.liu@...cle.com>, Minchan Kim <minchan@...nel.org>,
	Weijie Yang <weijie.yang@...sung.com>
Subject: Re: [PATCH] mm/zswap: change params from hidden to ro

Hi Dan!

On Wed, Nov 20, 2013 at 11:38:42AM -0500, Dan Streetman wrote:
> The "compressor" and "enabled" params are currently hidden,
> this changes them to read-only, so userspace can tell if
> zswap is enabled or not and see what compressor is in use.

Could you elaborate more why this pice of information is necessary for
userspace?

Vladimir

> 
> Signed-off-by: Dan Streetman <ddstreet@...e.org>
> ---
>  mm/zswap.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/zswap.c b/mm/zswap.c
> index d93510c..36b268b 100644
> --- a/mm/zswap.c
> +++ b/mm/zswap.c
> @@ -77,12 +77,12 @@ static u64 zswap_duplicate_entry;
>  **********************************/
>  /* Enable/disable zswap (disabled by default, fixed at boot for now) */
>  static bool zswap_enabled __read_mostly;
> -module_param_named(enabled, zswap_enabled, bool, 0);
> +module_param_named(enabled, zswap_enabled, bool, 0444);
>  
>  /* Compressor to be used by zswap (fixed at boot for now) */
>  #define ZSWAP_COMPRESSOR_DEFAULT "lzo"
>  static char *zswap_compressor = ZSWAP_COMPRESSOR_DEFAULT;
> -module_param_named(compressor, zswap_compressor, charp, 0);
> +module_param_named(compressor, zswap_compressor, charp, 0444);
>  
>  /* The maximum percentage of memory that the compressed pool can occupy */
>  static unsigned int zswap_max_pool_percent = 20;
> -- 
> 1.8.3.1
> 
> --
> To unsubscribe, send a message with 'unsubscribe linux-mm' in
> the body to majordomo@...ck.org.  For more info on Linux MM,
> see: http://www.linux-mm.org/ .
> Don't email: <a href=mailto:"dont@...ck.org"> email@...ck.org </a>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/