linux-kernel - Re: linux-next: build failure after merge of the rcu tree

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Message-ID: <8d9b7237-e7cf-4f4e-8190-6adf3ce8910a@paulmck-laptop>
Date:   Thu, 27 Jul 2023 07:08:44 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Arnd Bergmann <arnd@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the rcu tree

On Thu, Jul 27, 2023 at 02:19:30PM +1000, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the rcu tree, today's linux-next build (arm64 defconfig)
> failed like this:
> 
> In file included from arch/arm64/include/asm/alternative.h:9,
>                  from arch/arm64/include/asm/lse.h:14,
>                  from arch/arm64/include/asm/cmpxchg.h:14,
>                  from arch/arm64/include/asm/atomic.h:16,
>                  from include/linux/atomic.h:7,
>                  from include/asm-generic/bitops/atomic.h:5,
>                  from arch/arm64/include/asm/bitops.h:25,
>                  from include/linux/bitops.h:68,
>                  from arch/arm64/include/asm/cache.h:40,
>                  from include/linux/cache.h:6,
>                  from include/linux/slab.h:15,
>                  from include/linux/resource_ext.h:11,
>                  from include/linux/acpi.h:13,
>                  from include/acpi/apei.h:9,
>                  from include/acpi/ghes.h:5,
>                  from include/linux/arm_sdei.h:8,
>                  from arch/arm64/kernel/asm-offsets.c:10:
> include/linux/init.h:149:33: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__ro_after_init'
>   149 | extern char boot_command_line[] __ro_after_init;
>       |                                 ^~~~~~~~~~~~~~~
> 
> Caused by commit
> 
>   de2f542cfbec ("fs/proc: Add /proc/cmdline_load for boot loader arguments")
> 
> I have applied the following fix up (I have a faint memory that the
> section setting attributes are only needed on the definition, not the
> declaration):
> 
> From 9f56e539ed7d9c402caa85d4f5f3f8cec8373b2f Mon Sep 17 00:00:00 2001
> From: Stephen Rothwell <sfr@...b.auug.org.au>
> Date: Thu, 27 Jul 2023 13:26:08 +1000
> Subject: [PATCH] fix up for "fs/proc: Add /proc/cmdline_load for boot loader
>  arguments"
> 
> Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>

Thank you, Stephen, I will adjust the commit as shown below.

							Thanx, Paul

> ---
>  include/linux/init.h | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/include/linux/init.h b/include/linux/init.h
> index e3ce68988e1b..c075983c5015 100644
> --- a/include/linux/init.h
> +++ b/include/linux/init.h
> @@ -113,8 +113,6 @@
>  
>  #ifndef __ASSEMBLY__
>  
> -#include <linux/cache.h>
> -
>  /*
>   * Used for initialization calls..
>   */
> @@ -146,7 +144,7 @@ struct file_system_type;
>  
>  /* Defined in init/main.c */
>  extern int do_one_initcall(initcall_t fn);
> -extern char boot_command_line[] __ro_after_init;
> +extern char boot_command_line[];
>  extern char *saved_command_line;
>  extern unsigned int saved_command_line_len;
>  extern unsigned int reset_devices;
> -- 
> 2.40.1
> 
> -- 
> Cheers,
> Stephen Rothwell