linux-kernel - Re: [f2fs-dev] [PATCH 1/3] f2fs: factor out victim_entry usage from general rb

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Message-ID: <12dfeede-70e3-5c1b-7d3d-9f21c8ee9ff7@kernel.org>
Date:   Thu, 23 Mar 2023 22:22:37 +0800
From:   Chao Yu <chao@...nel.org>
To:     Jaegeuk Kim <jaegeuk@...nel.org>, linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Cc:     stable@...r.kernel.org
Subject: Re: [f2fs-dev] [PATCH 1/3] f2fs: factor out victim_entry usage from
 general rb_tree use

On 2023/3/14 4:12, Jaegeuk Kim wrote:
> Let's reduce the complexity of mixed use of rb_tree in victim_entry from
> extent_cache and discard_cmd.
> 
> This should fix arm32 memory alignment issue caused by shared rb_entry.
> 
> [struct victim_entry]              [struct rb_entry]
> [0] struct rb_node rb_node;        [0] struct rb_node rb_node;
>                                         union {
>                                           struct {
>                                             unsigned int ofs;
>                                             unsigned int len;
>                                           };
> [16] unsigned long long mtime;     [12] unsigned long long key;
>                                         } __packed;
> 
> Cc: <stable@...r.kernel.org>
> Fixes: 093749e296e2 ("f2fs: support age threshold based garbage collection")
> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>

Reviewed-by: Chao Yu <chao@...nel.org>

Thanks,