linux-kernel - Re: powerpc: nvram_64.c:75:13: error: 'oops_to

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Date: Thu, 27 Jun 2024 15:00:03 +0200
From: "Arnd Bergmann" <arnd@...db.de>
To: "Naresh Kamboju" <naresh.kamboju@...aro.org>,
 "open list" <linux-kernel@...r.kernel.org>,
 linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>, linux-mm <linux-mm@...ck.org>,
 lkft-triage@...ts.linaro.org,
 "Linux Regressions" <regressions@...ts.linux.dev>
Cc: "Jocelyn Falempe" <jfalempe@...hat.com>,
 "Anders Roxell" <anders.roxell@...aro.org>,
 "Christophe Leroy" <christophe.leroy@...roup.eu>,
 "Aneesh Kumar K.V" <aneesh.kumar@...nel.org>,
 "Nicholas Piggin" <npiggin@...il.com>,
 "Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>,
 "Andrew Morton" <akpm@...ux-foundation.org>,
 "Dan Carpenter" <dan.carpenter@...aro.org>
Subject: Re: powerpc: nvram_64.c:75:13: error: 'oops_to_nvram' used but never defined
 [-Werror]

On Thu, Jun 27, 2024, at 14:49, Naresh Kamboju wrote:
> The powerpc builds failed on Linux next-20240626 tag due to following 
> ----
> arch/powerpc/kernel/nvram_64.c:79:17: error: initialization of 'void
> (*)(struct kmsg_dumper *, enum kmsg_dump_reason,  const char *)' from
> incompatible pointer type 'void (*)(struct kmsg_dumper *, enum
> kmsg_dump_reason)' [-Werror=incompatible-pointer-types]
>    79 |         .dump = oops_to_nvram
>       |                 ^~~~~~~~~~~~~
> arch/powerpc/kernel/nvram_64.c:79:17: note: (near initialization for
> 'nvram_kmsg_dumper.dump')
> arch/powerpc/kernel/nvram_64.c:645:13: error: conflicting types for
> 'oops_to_nvram'; have 'void(struct kmsg_dumper *, enum
> kmsg_dump_reason,  const char *)'
>   645 | static void oops_to_nvram(struct kmsg_dumper *dumper,
>       |             ^~~~~~~~~~~~~
> arch/powerpc/kernel/nvram_64.c:75:13: note: previous declaration of
> 'oops_to_nvram' with type 'void(struct kmsg_dumper *, enum
> kmsg_dump_reason)'
>    75 | static void oops_to_nvram(struct kmsg_dumper *dumper,
>       |             ^~~~~~~~~~~~~
> arch/powerpc/kernel/nvram_64.c:75:13: error: 'oops_to_nvram' used but
> never defined [-Werror]
> arch/powerpc/kernel/nvram_64.c:645:13: error: 'oops_to_nvram' defined
> but not used [-Werror=unused-function]
>   645 | static void oops_to_nvram(struct kmsg_dumper *dumper,
>       |             ^~~~~~~~~~~~~
> cc1: all warnings being treated as error

The problem is the forward declaration that was not changed
as part of commit 7e72bb7504d1 ("printk: add a short
description string to kmsg_dump()"). This should fix it:

diff --git a/arch/powerpc/kernel/nvram_64.c b/arch/powerpc/kernel/nvram_64.c
index e385d3164648..a9da83c4243a 100644
--- a/arch/powerpc/kernel/nvram_64.c
+++ b/arch/powerpc/kernel/nvram_64.c
@@ -73,7 +73,8 @@ static const char *nvram_os_partitions[] = {
 };

 static void oops_to_nvram(struct kmsg_dumper *dumper,
-			  enum kmsg_dump_reason reason);
+			  enum kmsg_dump_reason reason,
+			  const char *desc);

 static struct kmsg_dumper nvram_kmsg_dumper = {
 	.dump = oops_to_nvram

      Arnd