summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/include/asm/page_32.h
diff options
context:
space:
mode:
authorChristophe Leroy <christophe.leroy@c-s.fr>2016-02-09 17:08:25 +0100
committerScott Wood <oss@buserror.net>2016-03-11 17:20:11 -0600
commit5736f96d12dd4204d3aac43bf7b512ab434b904f (patch)
tree396af6f695328a3ab83feecb6b424c8c09616aa3 /arch/powerpc/include/asm/page_32.h
parentd6bfa02fccf58b957f457c1bd0bb71f6ab169a0b (diff)
downloadlinux-5736f96d12dd4204d3aac43bf7b512ab434b904f.tar.bz2
powerpc32: Remove clear_pages() and define clear_page() inline
clear_pages() is never used expect by clear_page, and PPC32 is the only architecture (still) having this function. Neither PPC64 nor any other architecture has it. This patch removes clear_pages() and moves clear_page() function inline (same as PPC64) as it only is a few isns Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <oss@buserror.net>
Diffstat (limited to 'arch/powerpc/include/asm/page_32.h')
-rw-r--r--arch/powerpc/include/asm/page_32.h17
1 files changed, 14 insertions, 3 deletions
diff --git a/arch/powerpc/include/asm/page_32.h b/arch/powerpc/include/asm/page_32.h
index 68d73b2a7bfc..6a8e1797f223 100644
--- a/arch/powerpc/include/asm/page_32.h
+++ b/arch/powerpc/include/asm/page_32.h
@@ -1,6 +1,8 @@
#ifndef _ASM_POWERPC_PAGE_32_H
#define _ASM_POWERPC_PAGE_32_H
+#include <asm/cache.h>
+
#if defined(CONFIG_PHYSICAL_ALIGN) && (CONFIG_PHYSICAL_START != 0)
#if (CONFIG_PHYSICAL_START % CONFIG_PHYSICAL_ALIGN) != 0
#error "CONFIG_PHYSICAL_START must be a multiple of CONFIG_PHYSICAL_ALIGN"
@@ -36,9 +38,18 @@ typedef unsigned long long pte_basic_t;
typedef unsigned long pte_basic_t;
#endif
-struct page;
-extern void clear_pages(void *page, int order);
-static inline void clear_page(void *page) { clear_pages(page, 0); }
+/*
+ * Clear page using the dcbz instruction, which doesn't cause any
+ * memory traffic (except to write out any cache lines which get
+ * displaced). This only works on cacheable memory.
+ */
+static inline void clear_page(void *addr)
+{
+ unsigned int i;
+
+ for (i = 0; i < PAGE_SIZE / L1_CACHE_BYTES; i++, addr += L1_CACHE_BYTES)
+ dcbz(addr);
+}
extern void copy_page(void *to, void *from);
#include <asm-generic/getorder.h>