linux-kernel - [PATCH] blackfin: include: asm: pgtable: Define dummy pgprot

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Date:	Sat, 4 Apr 2015 04:36:31 +0800
From:	Chen Gang <xili_gchen_5257@...mail.com>
To:	realmz6@...il.com
CC:	kirill.shutemov@...ux.intel.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	"adi-buildroot-devel@...ts.sourceforge.net" 
	<adi-buildroot-devel@...ts.sourceforge.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] blackfin: include: asm: pgtable: Define dummy pgprot_writecombine

It is copied from asm-generic, the related error with allmodconfig:

    CC [M]  sound/core/pcm_native.o
  sound/core/pcm_native.c: In function 'snd_pcm_lib_default_mmap':
  sound/core/pcm_native.c:3387:24: error: implicit declaration of function 'pgprot_writecombine' [-Werror=implicit-function-declaration]
     area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
                          ^
  sound/core/pcm_native.c:3387:22: error: incompatible types when assigning to type 'pgprot_t {aka struct <anonymous>}' from type 'int'
     area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
                        ^

Signed-off-by: Chen Gang <gang.chen.5i5j@...il.com>
---
 arch/blackfin/include/asm/pgtable.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/blackfin/include/asm/pgtable.h b/arch/blackfin/include/asm/pgtable.h
index b88a155..3e730d9 100644
--- a/arch/blackfin/include/asm/pgtable.h
+++ b/arch/blackfin/include/asm/pgtable.h
@@ -36,6 +36,7 @@ typedef pte_t *pte_addr_t;
 #define PAGE_READONLY		__pgprot(0)	/* these mean nothing to NO_MM */
 #define PAGE_KERNEL		__pgprot(0)	/* these mean nothing to NO_MM */
 #define pgprot_noncached(prot)	(prot)
+#define pgprot_writecombine	pgprot_noncached
 
 extern void paging_init(void);
 
-- 
1.9.3
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