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Re: [PATCH] xen/efi: Use blexit() instead of BUG_ON() in read_file()
- To: Szymon Acedański <accek@xxxxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 2 Jun 2026 14:34:14 +0200
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- Cc: "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 02 Jun 2026 12:34:11 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 02.06.2026 14:24, Szymon Acedański wrote:
> Follow-up to 880e40b187aa ("xen/efi: Fix boot from a device without
> a file system"), which added a BUG_ON() guard in read_file().
>
> But as Jan pointed out, before ExitBootServices BUG_ON()
> is not functional. It results in a hang with no message.
>
> On the other hand blexit() prints a message and returns back
> to the bootloader.
>
> Link:
> https://lore.kernel.org/xen-devel/bb0f007e-697e-4501-97ea-3b59cf494ec6@xxxxxxxx/T/#m4725c8cbc0946a5533aea03fc240267ef139648d
While Linux uses Link:, as per sending-patches.pandoc we don't. It wants
to be Reported-by: instead, and there wants to be a Fixes: tag.
> Signed-off-by: Szymon Acedański <accek@xxxxxxxxxxxxxxxxxxxxxx>
With the above properly sorted:
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
Jan
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