sh: Support explicit L1 cache disabling.

This reworks the cache mode configuration in Kconfig, and allows for
explicit selection of write-back/write-through/off configurations.
All of the cache flushing routines are optimized away for the off
case.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 4 insertions, 3 deletions

diff --git a/arch/sh/kernel/sh_ksyms.c b/arch/sh/kernel/sh_ksyms.c
index 37aef0a85197..de250705c35e 100644
--- a/arch/sh/kernel/sh_ksyms.c
+++ b/arch/sh/kernel/sh_ksyms.c
@@ -128,7 +128,8 @@ DECLARE_EXPORT(__movstrSI12_i4);
 #endif /* __GNUC__ == 4 */
 #endif
 
-#if defined(CONFIG_CPU_SH4) || defined(CONFIG_SH7705_CACHE_32KB)
+#if !defined(CONFIG_CACHE_OFF) && (defined(CONFIG_CPU_SH4) || \
+        defined(CONFIG_SH7705_CACHE_32KB))
 /* needed by some modules */
 EXPORT_SYMBOL(flush_cache_all);
 EXPORT_SYMBOL(flush_cache_range);
@@ -136,8 +137,8 @@ EXPORT_SYMBOL(flush_dcache_page);
 EXPORT_SYMBOL(__flush_purge_region);
 #endif
 
-#if defined(CONFIG_MMU) && (defined(CONFIG_CPU_SH4) || \
-        defined(CONFIG_SH7705_CACHE_32KB))
+#if !defined(CONFIG_CACHE_OFF) && defined(CONFIG_MMU) && \
+        (defined(CONFIG_CPU_SH4) || defined(CONFIG_SH7705_CACHE_32KB))
 EXPORT_SYMBOL(clear_user_page);
 #endif