linux-kernel - [PATCH] mm/early_ioremap: add explicit #include of asm/early

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Date:	Thu, 10 Sep 2015 18:00:48 +0200
From:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	akpm@...ux-foundation.org, msalter@...hat.com
Cc:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
Subject: [PATCH] mm/early_ioremap: add explicit #include of asm/early_ioremap.h

Commit 6b0f68e32ea8 ("mm: add utility for early copy from unmapped
ram") introduces a function copy_from_early_mem() into mm/early_ioremap.c
which itself calls early_memremap()/early_memunmap(). However, since
early_memunmap() has not been declared yet at this point in the .c file,
nor by any explicitly included header files, we are depending on a
transitive include of asm/early_ioremap.h to declare it, which is fragile.

So instead, include this header explicitly.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
---

I ran into this by accident when trying to enable to the generic ioremap
implementation for 32-bit ARM.

 mm/early_ioremap.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/early_ioremap.c b/mm/early_ioremap.c
index 23f744d77ce0..17ae14b5aefa 100644
--- a/mm/early_ioremap.c
+++ b/mm/early_ioremap.c
@@ -15,6 +15,7 @@
 #include <linux/mm.h>
 #include <linux/vmalloc.h>
 #include <asm/fixmap.h>
+#include <asm/early_ioremap.h>

 #ifdef CONFIG_MMU
 static int early_ioremap_debug __initdata;
-- 
1.9.1

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