* Fwd: [PATCH] c6x: asm: pgtable: Define dummy pgprot_writecombine for !MMU
[not found] <54F4ECF1.6060709@qq.com>
@ 2015-03-02 23:15 ` Chen Gang S
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From: Chen Gang S @ 2015-03-02 23:15 UTC (permalink / raw)
To: Chen Gang, linux-kernel@vger.kernel.org
-------- 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@qq.com>
To: msalter@redhat.com, a-jacquiot@ti.com
CC: kirill.shutemov@linux.intel.com, Andrew Morton <akpm@linux-foundation.org>, linux-c6x-dev@linux-c6x.org <linux-c6x-dev@linux-c6x.org>, linux-kernel@vger.kernel.org <linux-kernel@vger.kernel.org>
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@gmail.com>
---
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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