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: NChristophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: NScott Wood <oss@buserror.net>

arch/powerpc/include/asm/page_32.h

 #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>

arch/powerpc/kernel/misc_32.S

@@ -516,22 +516,6 @@ END_FTR_SECTION_IFSET(CPU_FTR_COHERENT_ICACHE)
 	blr
 #endif /* CONFIG_BOOKE */
 
-/*
- * Clear pages 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.
- *
- * void clear_pages(void *page, int order) ;
- */
-_GLOBAL(clear_pages)
-	li	r0,PAGE_SIZE/L1_CACHE_BYTES
-	slw	r0,r0,r4
-	mtctr	r0
-1:	dcbz	0,r3
-	addi	r3,r3,L1_CACHE_BYTES
-	bdnz	1b
-	blr
-
 /*
  * Copy a whole page.  We use the dcbz instruction on the destination
  * to reduce memory traffic (it eliminates the unnecessary reads of

arch/powerpc/kernel/ppc_ksyms_32.c

@@ -10,7 +10,6 @@
 #include <asm/pgtable.h>
 #include <asm/dcr.h>
 
-EXPORT_SYMBOL(clear_pages);
 EXPORT_SYMBOL(ISA_DMA_THRESHOLD);
 EXPORT_SYMBOL(DMA_MODE_READ);
 EXPORT_SYMBOL(DMA_MODE_WRITE);