Fwd: [PATCH] c6x: asm: pgtable: Define dummy pgprot_writecombine for !MMU

From: Chen Gang S
Date: Mon Mar 02 2015 - 18:08:21 EST





-------- Forwarded Message --------
Subject: [PATCH] c6x: asm: pgtable: Define dummy pgprot_writecombine for !MMU
Date: Tue, 03 Mar 2015 07:06:25 +0800
From: Chen Gang <762976180@xxxxxx>
To: msalter@xxxxxxxxxx, a-jacquiot@xxxxxx
CC: kirill.shutemov@xxxxxxxxxxxxxxx, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, linux-c6x-dev@xxxxxxxxxxxxx <linux-c6x-dev@xxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx <linux-kernel@xxxxxxxxxxxxxxx>

When !MMU, asm-generic will not define default pgprot_writecombine, so
c6x needs to define it by itself. The related error:

CC [M] fs/pstore/ram_core.o
fs/pstore/ram_core.c: In function 'persistent_ram_vmap':
fs/pstore/ram_core.c:399:10: error: implicit declaration of function 'pgprot_writecombine' [-Werror=implicit-function-declaration]
prot = pgprot_writecombine(PAGE_KERNEL);
^
fs/pstore/ram_core.c:399:8: error: incompatible types when assigning to type 'pgprot_t {aka struct <anonymous>}' from type 'int'
prot = pgprot_writecombine(PAGE_KERNEL);
^

Signed-off-by: Chen Gang <gang.chen.5i5j@xxxxxxxxx>
---
arch/c6x/include/asm/pgtable.h | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/arch/c6x/include/asm/pgtable.h b/arch/c6x/include/asm/pgtable.h
index 78d4483..ec4db6d 100644
--- a/arch/c6x/include/asm/pgtable.h
+++ b/arch/c6x/include/asm/pgtable.h
@@ -67,6 +67,11 @@ extern unsigned long empty_zero_page;
*/
#define pgtable_cache_init() do { } while (0)

+/*
+ * c6x is !MMU, so define the simpliest implementation
+ */
+#define pgprot_writecombine pgprot_noncached
+
#include <asm-generic/pgtable.h>

#endif /* _ASM_C6X_PGTABLE_H */
--
1.9.3


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