From: Paul Mundt <lethal@linux-sh.org>
Date: Tue, 4 Aug 2009 06:57:44 +0000 (+0900)
Subject: sh: Add a PG_dcache_dirty sanity check in kmap_coherent().
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=700487c158163f14e6ff10de770b565c1c993c69;p=linux-beck.git

sh: Add a PG_dcache_dirty sanity check in kmap_coherent().

This plugs in a BUG_ON() in kmap_coherent() for PG_dcache_dirty pages
to catch when things go horribly wrong. Copied from the MIPS
implementation.

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

diff --git a/arch/sh/mm/pg-mmu.c b/arch/sh/mm/pg-mmu.c
index 8602f68af4c8..32351206edd3 100644
--- a/arch/sh/mm/pg-mmu.c
+++ b/arch/sh/mm/pg-mmu.c
@@ -37,6 +37,8 @@ static inline void *kmap_coherent(struct page *page, unsigned long addr)
 	unsigned long vaddr, flags;
 	pte_t pte;
 
+	BUG_ON(test_bit(PG_dcache_dirty, &page->flags));
+
 	inc_preempt_count();
 
 	idx = (addr & current_cpu_data.dcache.alias_mask) >> PAGE_SHIFT;