linux-kernel - [PATCH] mm/sparse.c: mark sparse_buffer_free as _

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Date:   Tue,  9 Jul 2019 20:55:07 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Lecopzer Chen <lecopzer.chen@...iatek.com>,
        Mark-PK Tsai <Mark-PK.Tsai@...iatek.com>,
        Arnd Bergmann <arnd@...db.de>,
        Oscar Salvador <osalvador@...e.de>,
        Michal Hocko <mhocko@...e.com>,
        Mike Rapoport <rppt@...ux.ibm.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] mm/sparse.c: mark sparse_buffer_free as __meminit

Calling an __init function from a __meminit function is not allowed:

WARNING: vmlinux.o(.meminit.text+0x30ff): Section mismatch in reference from the function sparse_buffer_alloc() to the function .init.text:sparse_buffer_free()
The function __meminit sparse_buffer_alloc() references
a function __init sparse_buffer_free().
If sparse_buffer_free is only used by sparse_buffer_alloc then
annotate sparse_buffer_free with a matching annotation.

Downgrade the annotation to __meminit for both, as they may be
used in the hotplug case.

Fixes: mmotm ("mm/sparse.c: fix memory leak of sparsemap_buf in aliged memory")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 mm/sparse.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/sparse.c b/mm/sparse.c
index 3267c4001c6d..4801d45bd66e 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -470,7 +470,7 @@ struct page __init *__populate_section_memmap(unsigned long pfn,
 static void *sparsemap_buf __meminitdata;
 static void *sparsemap_buf_end __meminitdata;
 
-static inline void __init sparse_buffer_free(unsigned long size)
+static inline void __meminit sparse_buffer_free(unsigned long size)
 {
 	WARN_ON(!sparsemap_buf || size == 0);
 	memblock_free_early(__pa(sparsemap_buf), size);
-- 
2.20.0