linux-kernel - [tip:x86/mm] x86, mm: Use MAX_DMA_PFN for ZONE

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Message-ID: <tip-ff14c1d01576fb839a925a42596582f6c68a1a1a@git.kernel.org>
Date:	Fri, 18 Nov 2011 15:22:49 -0800
From:	tip-bot for Pekka Enberg <penberg@...nel.org>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	yinghai@...nel.org, penberg@...nel.org, tj@...nel.org,
	tglx@...utronix.de, rientjes@...gle.com, mingo@...e.hu
Subject: [tip:x86/mm] x86, mm: Use MAX_DMA_PFN for ZONE_DMA on 32-bit

Commit-ID:  ff14c1d01576fb839a925a42596582f6c68a1a1a
Gitweb:     http://git.kernel.org/tip/ff14c1d01576fb839a925a42596582f6c68a1a1a
Author:     Pekka Enberg <penberg@...nel.org>
AuthorDate: Tue, 1 Nov 2011 15:58:16 +0200
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Fri, 11 Nov 2011 10:22:41 +0100

x86, mm: Use MAX_DMA_PFN for ZONE_DMA on 32-bit

Use MAX_DMA_PFN which represents the 16 MB ISA DMA limit on
32-bit x86 just like we do on 64-bit.

Acked-by: Tejun Heo <tj@...nel.org>
Acked-by: Yinghai Lu <yinghai@...nel.org>
Acked-by: David Rientjes <rientjes@...gle.com>
Signed-off-by: Pekka Enberg <penberg@...nel.org>
Link: http://lkml.kernel.org/r/1320155902-10424-1-git-send-email-penberg@kernel.org
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 arch/x86/mm/init_32.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index 29f7c6d..434c97d 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -679,8 +679,7 @@ static void __init zone_sizes_init(void)
 	unsigned long max_zone_pfns[MAX_NR_ZONES];
 	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
 #ifdef CONFIG_ZONE_DMA
-	max_zone_pfns[ZONE_DMA] =
-		virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
+	max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
 #endif
 	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
 #ifdef CONFIG_HIGHMEM
--
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