linux-kernel - [PATCH 1/2] initramfs: fix clang build failure

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Date:   Fri,  4 Dec 2020 17:57:33 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Arnd Bergmann <arnd@...db.de>, Barret Rhoden <brho@...gle.com>,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: [PATCH 1/2] initramfs: fix clang build failure

From: Arnd Bergmann <arnd@...db.de>

There is only one function in init/initramfs.c that is in the .text
section, and it is marked __weak. When building with clang-12 and
the integrated assembler, this leads to a bug with recordmcount:

./scripts/recordmcount  "init/initramfs.o"
Cannot find symbol for section 2: .text.
init/initramfs.o: failed

I'm not quite sure what exactly goes wrong, but I notice that this
function is only ever called from an __init function, and normally
inlined. Marking it __init as well is clearly correct and it
leads to recordmcount no longer complaining.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 init/initramfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/init/initramfs.c b/init/initramfs.c
index 1f97c0328a7a..55b74d7e5260 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -535,7 +535,7 @@ extern unsigned long __initramfs_size;
 #include <linux/initrd.h>
 #include <linux/kexec.h>

-void __weak free_initrd_mem(unsigned long start, unsigned long end)
+void __weak __init free_initrd_mem(unsigned long start, unsigned long end)
 {
 #ifdef CONFIG_ARCH_KEEP_MEMBLOCK
 	unsigned long aligned_start = ALIGN_DOWN(start, PAGE_SIZE);
-- 
2.27.0