linux-kernel - Re: [PATCH AUTOSEL 6.14 342/642] fs/mpage: avoid negative shift for large blocksize

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Message-ID: <aBlfg8tuWY1_GVPJ@bombadil.infradead.org>
Date: Mon, 5 May 2025 18:01:55 -0700
From: Luis Chamberlain <mcgrof@...nel.org>
To: Sasha Levin <sashal@...nel.org>
Cc: linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Hannes Reinecke <hare@...nel.org>,
	"Matthew Wilcox (Oracle)" <willy@...radead.org>,
	Hannes Reinecke <hare@...e.de>,
	Christian Brauner <brauner@...nel.org>, viro@...iv.linux.org.uk,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 6.14 342/642] fs/mpage: avoid negative shift for
 large blocksize

On Mon, May 05, 2025 at 06:09:18PM -0400, Sasha Levin wrote:
> From: Hannes Reinecke <hare@...nel.org>
> 
> [ Upstream commit 86c60efd7c0ede43bd677f2eee1d84200528df1e ]
> 
> For large blocksizes the number of block bits is larger than PAGE_SHIFT,
> so calculate the sector number from the byte offset instead. This is
> required to enable large folios with buffer-heads.
> 
> Reviewed-by: "Matthew Wilcox (Oracle)" <willy@...radead.org>
> Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
> Signed-off-by: Hannes Reinecke <hare@...nel.org>
> Link: https://lore.kernel.org/r/20250221223823.1680616-4-mcgrof@kernel.org
> Reviewed-by: Hannes Reinecke <hare@...e.de>
> Signed-off-by: Christian Brauner <brauner@...nel.org>
> Signed-off-by: Sasha Levin <sashal@...nel.org>

This is not relevant to older kernels as we had no buffer-head usage of
large folios before v6.15. So this is just creating noise / drama for
older kernels.

Where's that code for  auto-sel again?

  Luis