linux-kernel - Re: WinLink E850-96: WARNING: at block/blk-settings.c:204 blk_validate

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Date: Thu, 29 Feb 2024 15:21:44 +0100
From: Christoph Hellwig <hch@....de>
To: Naresh Kamboju <naresh.kamboju@...aro.org>
Cc: linux-block <linux-block@...r.kernel.org>, lkft-triage@...ts.linaro.org,
	open list <linux-kernel@...r.kernel.org>,
	Jens Axboe <axboe@...nel.dk>, Christoph Hellwig <hch@....de>,
	Christian Brauner <brauner@...nel.org>,
	Ulf Hansson <ulf.hansson@...aro.org>, Arnd Bergmann <arnd@...db.de>,
	Dan Carpenter <dan.carpenter@...aro.org>,
	Anders Roxell <anders.roxell@...aro.org>
Subject: Re: WinLink E850-96: WARNING: at block/blk-settings.c:204
 blk_validate_limits

On Thu, Feb 29, 2024 at 07:44:01PM +0530, Naresh Kamboju wrote:
> The arm64 WinLink E850-96 Board boot failed with 16K and 64K page size builds
> Please find the below warning log on Linux next-20240229.
> First noticed on the next-20240220 tag.
> 
> This issue arises only when one of these Kconfig options is enabled.
>   CONFIG_ARM64_16K_PAGES=y
>   CONFIG_ARM64_64K_PAGES=y

That means this device doesn't set a max_segment_size, or one smaller
than the page size.  This configurtio has never been supported by
Linux (Bart has some patches to try to make it work), but with the
new block limits API we now actively catchthis and warn.