[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 <[e-mail]>
Acked-by: Matt Porter <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

arch/ppc/mm/init.c

···
 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)); 

include/asm-ppc/kmap_types.h

···
 	KM_SOFTIRQ0,
 	KM_SOFTIRQ1,
 	KM_PPC_SYNC_PAGE,
+	KM_PPC_SYNC_ICACHE,
 	KM_TYPE_NR
 };