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From: nick.spence@freescale.com
To: linuxppc-dev@ozlabs.org
Cc: Nick Spence <nick.spence@freescale.com>
Subject: [PATCH] [POWERPC] Reintroduce O_SYNC flag to make DRAM non-cached.
Date: Wed,  7 May 2008 22:26:32 -0700	[thread overview]
Message-ID: <1210224392246-git-send-email-nick.spence@freescale.com> (raw)

From: Nick Spence <nick.spence@freescale.com>

This patch re-introduces the O_SYNC flag to make DRAM non-cached, which is the default behavior
for non PowerPC architectures in /drivers/char/mem.c

Signed-off-by: Nick Spence <nick.spence@freescale.com>
---
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 5ccb579..f994b0a 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -101,7 +101,7 @@ pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 	if (ppc_md.phys_mem_access_prot)
 		return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot);
 
-	if (!page_is_ram(pfn))
+	if ((file->f_flags & O_SYNC) || (!page_is_ram(pfn)))
 		vma_prot = __pgprot(pgprot_val(vma_prot)
 				    | _PAGE_GUARDED | _PAGE_NO_CACHE);
 	return vma_prot;
-- 
1.5.5

             reply	other threads:[~2008-05-08  5:27 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-05-08  5:26 nick.spence [this message]
2008-05-08  5:50 ` [PATCH] [POWERPC] Reintroduce O_SYNC flag to make DRAM non-cached Paul Mackerras
2008-05-08  6:31   ` Spence Nick
2008-05-08  6:55     ` Benjamin Herrenschmidt
2008-05-08  7:17       ` Nick Spence
2008-05-08  7:21         ` Benjamin Herrenschmidt
2008-05-08  9:54     ` Segher Boessenkool

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