Re: linux-next: build warnings in Linus' tree

Borislav Petkov
2021-11-23T07:04:46Z

On Tue, Nov 23, 2021 at 09:44:19AM +1100, Stephen Rothwell wrote:
> Hi all,
>
> Building Linus' tree, today's linux-next build (x86_64 allmodconfig)
> produced these warnings:
>
> WARNING: modpost: vmlinux.o(.text.unlikely+0x63df): Section mismatch in reference from the function prepare_command_line() to the variable .init.data:builtin_cmdline
> The function prepare_command_line() references
> the variable __initdata builtin_cmdline.
> This is often because prepare_command_line lacks a __initdata
> annotation or the annotation of builtin_cmdline is wrong.

Doesn't trigger with my toolchain, because it simply inlines that
function.

Anyway, fix is trivial, thanks for reporting.

---
From 4f4226a7dce0c5b6d911574f7fa5870c4ee693ff Mon Sep 17 00:00:00 2001
From: Borislav Petkov <bp@suse.de>
Date: Tue, 23 Nov 2021 07:53:57 +0100
Subject: [PATCH] x86/boot: Mark prepare_command_line() __init

Fix:

WARNING: modpost: vmlinux.o(.text.unlikely+0x64d0): Section mismatch in reference \
from the function prepare_command_line() to the variable .init.data:command_line
The function prepare_command_line() references
the variable __initdata command_line.
This is often because prepare_command_line lacks a __initdata
annotation or the annotation of command_line is wrong.

Apparently some toolchains do different inlining decisions.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20211123094419.08000327@canb.auug.org.au
---
arch/x86/kernel/setup.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index c410be738ae7..6a190c7f4d71 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -742,7 +742,7 @@ dump_kernel_offset(struct notifier_block *self, unsigned long v, void *p)
return 0;
}

-static char *prepare_command_line(void)
+static char * __init prepare_command_line(void)
{
#ifdef CONFIG_CMDLINE_BOOL
#ifdef CONFIG_CMDLINE_OVERRIDE
--
2.29.2

--
Regards/Gruss,
Boris.

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