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Date:   Thu, 15 Dec 2022 16:35:48 -0800
From:   Andrew Morton <akpm@linux-foundation.org>
To:     Stephen Rothwell <sfr@canb.auug.org.au>
Cc:     "Masami Hiramatsu (Google)" <mhiramat@kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux Next Mailing List <linux-next@vger.kernel.org>
Subject: Re: linux-next: build failure after merge of the mm tree
Message-Id: <20221215163548.7c321bb0fac2343a8ef7d202@linux-foundation.org>
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On Fri, 16 Dec 2022 11:21:21 +1100 Stephen Rothwell <sfr@canb.auug.org.au> wrote:

> Hi all,
> 
> After merging the mm tree, today's linux-next build (powerpc
> ppc64_defconfig) failed like this:
> 
> In file included from fs/btrfs/tree-checker.c:20:
> include/linux/error-injection.h: In function 'get_injectable_error_type':
> include/linux/error-injection.h:22:17: error: 'EOPNOTSUPP' undeclared (first use in this function)
>    22 |         return -EOPNOTSUPP;
>       |                 ^~~~~~~~~~
> include/linux/error-injection.h:22:17: note: each undeclared identifier is reported only once for each function it appears in
> 
> Caused by commit
> 
>   fcb9954aa1dc ("error-injection: remove EI_ETYPE_NONE")
> 
> I have reverted that commit for today (and the following one).

Thanks.  I'll try the obvious:

--- a/include/linux/error-injection.h~error-injection-remove-ei_etype_none-fix
+++ a/include/linux/error-injection.h
@@ -4,6 +4,7 @@
 
 #include <linux/compiler.h>
 #include <asm-generic/error-injection.h>
+#include <linux/errno.h>
 
 #ifdef CONFIG_FUNCTION_ERROR_INJECTION
 
_