[PATCH] ppc32: Don't sleep in flush_dcache_icache_page()

flush_dcache_icache_page() will be called on an instruction page fault.  We
can't sleep in the fault handler, so use kmap_atomic() instead of just
kmap() for the Book-E case.

Signed-off-by: Roland Dreier <rolandd@cisco.com>
Acked-by: Matt Porter <mporter@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/arch/ppc/mm/init.c b/arch/ppc/mm/init.c
index 33ada72..32ee497 100644 (file)
--- a/arch/ppc/mm/init.c
+++ b/arch/ppc/mm/init.c
@@ -560,8 +560,9 @@ void flush_dcache_page(struct page *page)
 void flush_dcache_icache_page(struct page *page)
 {
 #ifdef CONFIG_BOOKE
-       __flush_dcache_icache(kmap(page));
-       kunmap(page);
+       void *start = kmap_atomic(page, KM_PPC_SYNC_ICACHE);
+       __flush_dcache_icache(start);
+       kunmap_atomic(start, KM_PPC_SYNC_ICACHE);
 #elif CONFIG_8xx
        /* On 8xx there is no need to kmap since highmem is not supported */
        __flush_dcache_icache(page_address(page)); 

diff --git a/include/asm-ppc/kmap_types.h b/include/asm-ppc/kmap_types.h
index 2589f18..6d6fc78 100644 (file)
--- a/include/asm-ppc/kmap_types.h
+++ b/include/asm-ppc/kmap_types.h
@@ -17,6 +17,7 @@ enum km_type {
        KM_SOFTIRQ0,
        KM_SOFTIRQ1,
        KM_PPC_SYNC_PAGE,
+       KM_PPC_SYNC_ICACHE,
        KM_TYPE_NR
 };