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

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__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>
This commit is contained in:
Scott Wood
2015-04-15 19:40:23 -05:00
parent 501c8de7b0
commit 2f7d2b74a9
2 changed files with 13 additions and 8 deletions
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7
arch/powerpc/include/asm/cacheflush.h
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@@ -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