powerpc/mm: Don't call __flush_dcache_icache_phys() with PA>VA

__flush_dcache_icache_phys() requires the ability to access the
memory with the MMU disabled, which means that on a 32-bit system
any memory above 4 GiB is inaccessible.  In particular, mpc86xx is
32-bit and can have more than 4 GiB of RAM.

Signed-off-by: Scott Wood <scottwood@freescale.com>

2 files changed, 13 insertions, 8 deletions

diff --git a/arch/powerpc/include/asm/cacheflush.h b/arch/powerpc/include/asm/cacheflush.h
index 30b35fff2dea..6229e6b6037b 100644
--- a/arch/powerpc/include/asm/cacheflush.h
+++ b/arch/powerpc/include/asm/cacheflush.h
@@ -40,7 +40,12 @@ extern void __flush_dcache_icache(void *page_va);
 extern void flush_dcache_icache_page(struct page *page);
 #if defined(CONFIG_PPC32) && !defined(CONFIG_BOOKE)
 extern void __flush_dcache_icache_phys(unsigned long physaddr);
-#endif /* CONFIG_PPC32 && !CONFIG_BOOKE */
+#else
+static inline void __flush_dcache_icache_phys(unsigned long physaddr)
+{
+        BUG();
+}
+#endif
 
 extern void flush_dcache_range(unsigned long start, unsigned long stop);
 #ifdef CONFIG_PPC32
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 0f11819d8f1d..e1fe333da946 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -414,17 +414,17 @@ void flush_dcache_icache_page(struct page *page)
                 return;
         }
 #endif
-#ifdef CONFIG_BOOKE
-        {
+#if defined(CONFIG_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 *)) {
                 void *start = kmap_atomic(page);
                 __flush_dcache_icache(start);
                 kunmap_atomic(start);
+        } else {
+                __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT);
         }
-#elif defined(CONFIG_8xx) || defined(CONFIG_PPC64)
-        /* On 8xx there is no need to kmap since highmem is not supported */
-        __flush_dcache_icache(page_address(page)); 
-#else
-        __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT);
 #endif
 }
 EXPORT_SYMBOL(flush_dcache_icache_page);