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Date:   Wed, 30 Dec 2020 09:34:08 +0100
From:   Roger Pau Monné <>
To:     YANG LI <>
CC:     <>, <>,
        <>, <>,
Subject: Re: [PATCH] xen: fix: use WARN_ON instead of if condition followed
 by BUG.

On Wed, Dec 30, 2020 at 02:38:06PM +0800, YANG LI wrote:
> Use WARN_ON instead of if condition followed by BUG in
> gnttab_batch_map() and gnttab_batch_copy().

But those are not equivalent as far as I'm aware. BUG will stop
execution, while WARN_ON will print a splat and continue executing.

If switching to WARN_ON is indeed fine it needs to be explained in the
commit message that returning to the caller(s) with
HYPERVISOR_grant_table_op having returned an error code is fine, and
that it's not going to create other issues, like memory corruption or

Thanks, Roger.

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