linux-kernel - [PATCH] mm/shuffle: fix section mismatch warning

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Date:   Fri, 14 May 2021 15:59:48 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        David Hildenbrand <david@...hat.com>,
        Wei Yang <richard.weiyang@...ux.alibaba.com>,
        Dan Williams <dan.j.williams@...el.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: [PATCH] mm/shuffle: fix section mismatch warning

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

clang sometimes decides not to inline shuffle_zone(), but it calls
a __meminit function. Without the extra __meminit annotation we get
this warning:

WARNING: modpost: vmlinux.o(.text+0x2a86d4): Section mismatch in reference from the function shuffle_zone() to the function .meminit.text:__shuffle_zone()
The function shuffle_zone() references
the function __meminit __shuffle_zone().
This is often because shuffle_zone lacks a __meminit
annotation or the annotation of __shuffle_zone is wrong.

shuffle_free_memory() did not show the same problem in my tests, but
it could happen in theory as well, so mark both as __meminit.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 mm/shuffle.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/shuffle.h b/mm/shuffle.h
index 71b784f0b7c3..cec62984f7d3 100644
--- a/mm/shuffle.h
+++ b/mm/shuffle.h
@@ -10,7 +10,7 @@
 DECLARE_STATIC_KEY_FALSE(page_alloc_shuffle_key);
 extern void __shuffle_free_memory(pg_data_t *pgdat);
 extern bool shuffle_pick_tail(void);
-static inline void shuffle_free_memory(pg_data_t *pgdat)
+static inline void __meminit shuffle_free_memory(pg_data_t *pgdat)
 {
 	if (!static_branch_unlikely(&page_alloc_shuffle_key))
 		return;
@@ -18,7 +18,7 @@ static inline void shuffle_free_memory(pg_data_t *pgdat)
 }
 
 extern void __shuffle_zone(struct zone *z);
-static inline void shuffle_zone(struct zone *z)
+static inline void __meminit shuffle_zone(struct zone *z)
 {
 	if (!static_branch_unlikely(&page_alloc_shuffle_key))
 		return;
-- 
2.29.2