powerpc/mem: flush_dcache_icache_phys() is for HIGHMEM pages only

[linux-2.6-microblaze.git] / arch / powerpc / mm / cacheflush.c

diff --git a/arch/powerpc/mm/cacheflush.c b/arch/powerpc/mm/cacheflush.c
index 3268a3e..2d92cb6 100644 (file)
--- a/arch/powerpc/mm/cacheflush.c
+++ b/arch/powerpc/mm/cacheflush.c
@@ -76,7 +76,7 @@ void flush_icache_range(unsigned long start, unsigned long stop)
 }
 EXPORT_SYMBOL(flush_icache_range);
 
-#if !defined(CONFIG_PPC_8xx) && !defined(CONFIG_PPC64)
+#ifdef CONFIG_HIGHMEM
 /**
  * flush_dcache_icache_phys() - Flush a page by it's physical address
  * @physaddr: the physical address of the page
@@ -115,7 +115,11 @@ static void flush_dcache_icache_phys(unsigned long physaddr)
                : "ctr", "memory");
 }
 NOKPROBE_SYMBOL(flush_dcache_icache_phys)
-#endif // !defined(CONFIG_PPC_8xx) && !defined(CONFIG_PPC64)
+#else
+static void flush_dcache_icache_phys(unsigned long physaddr)
+{
+}
+#endif
 
 /*
  * This is called when a page has been modified by the kernel.
@@ -185,18 +189,15 @@ void flush_dcache_icache_page(struct page *page)
        if (PageCompound(page))
                return flush_dcache_icache_hugepage(page);
 
-#if defined(CONFIG_PPC_8xx) || defined(CONFIG_PPC64)
-       /* On 8xx there is no need to kmap since highmem is not supported */
-       __flush_dcache_icache(page_address(page));
-#else
-       if (IS_ENABLED(CONFIG_BOOKE) || sizeof(phys_addr_t) > sizeof(void *)) {
+       if (!PageHighMem(page)) {
+               __flush_dcache_icache(lowmem_page_address(page));
+       } else if (IS_ENABLED(CONFIG_BOOKE) || sizeof(phys_addr_t) > sizeof(void *)) {
                void *start = kmap_atomic(page);
                __flush_dcache_icache(start);
                kunmap_atomic(start);
        } else {
                flush_dcache_icache_phys(page_to_phys(page));
        }
-#endif
 }
 EXPORT_SYMBOL(flush_dcache_icache_page);