linux-kernel - Re: [PATCH] erofs: avoid noisy messages for transient -ENOMEM

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Message-ID: <62cc89b9-a70d-4506-826b-28eb4010e372@kernel.org>
Date: Thu, 22 Jan 2026 17:03:52 +0800
From: Chao Yu <chao@...nel.org>
To: Gao Xiang <hsiangkao@...ux.alibaba.com>, linux-erofs@...ts.ozlabs.org
Cc: chao@...nel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] erofs: avoid noisy messages for transient -ENOMEM

On 12/26/2025 2:09 PM, Gao Xiang wrote:
> EROFS may allocate temporary pages using GFP_NOWAIT | GFP_NORETRY
> when pcl->besteffort is off (e.g., for readahead requests).
> 
> If the allocation fails, the original request will fall back to
> synchronous read, so the failure is transient.
> 
> Such fallback can frequently happen in low memory scenarios, but since
> these failures are expected and temporary, avoid printing error
> messages like below:
> 
> [ 7425.184264] erofs (device sr0): failed to decompress (lz4) -ENOMEM @ pa 148447232 size 28672 => 26788
> [ 7426.244267] erofs (device sr0): failed to decompress (lz4) -ENOMEM @ pa 149422080 size 28672 => 15903
> [ 7426.245508] erofs (device sr0): failed to decompress (lz4) -ENOMEM @ pa 138440704 size 28672 => 39294
> ...
> [ 7504.258373] erofs (device sr0): failed to decompress (lz4) -ENOMEM @ pa 93581312 size 20480 => 47366
> 
> Fixes: 831faabed812 ("erofs: improve decompression error reporting")
> Signed-off-by: Gao Xiang <hsiangkao@...ux.alibaba.com>

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

Thanks,