Regression with v5.18-rc1 tag on STM32F7 and STM32H7 based boards

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To: <hughd@xxxxxxxxxx>, <mpatocka@xxxxxxxxxx>, <lczerner@xxxxxxxxxx>, <djwong@xxxxxxxxxx>, <hch@xxxxxx>, <zkabelac@xxxxxxxxxx>, <djwong@xxxxxxxxxx>, <miklos@xxxxxxxxxx>, <bp@xxxxxxx>, <akpm@xxxxxxxxxxxxxxxxxxxx>
Subject: Regression with v5.18-rc1 tag on STM32F7 and STM32H7 based boards
From: Patrice CHOTARD <patrice.chotard@xxxxxxxxxxx>
Date: Tue, 5 Apr 2022 17:15:57 +0200
Cc: Alexandre TORGUE - foss <alexandre.torgue@xxxxxxxxxxx>, Valentin CARON - foss <valentin.caron@xxxxxxxxxxx>, <linux-stm32@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, <linux-fsdevel@xxxxxxxxxxxxxxx>, <linux-mm@xxxxxxxxx>
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Hi Guys

We found an issue with last kernel tag v5.18-rc1 on stm32f746-disco and 
stm32h743-disco boards (ARMV7-M SoCs).

Kernel hangs when executing SetPageUptodate(ZERO_PAGE(0)); in mm/filemap.c.

By reverting commit 56a8c8eb1eaf ("tmpfs: do not allocate pages on read"), 
kernel boots without any issue.

Thanks
Patrice

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