linux-kernel - [PATCH] x86/pci: make pci_mem

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Date:	Tue, 14 Apr 2009 13:50:39 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-pci@...r.kernel.org, yannick.roehlly@...e.fr
Subject: [PATCH] x86/pci: make pci_mem_start to be aligned only


Impact: make more big space below 4g for assigning to unassigned pci devices

don't need to reserved one round after the gapstart.

Reported-and-tested-by: Yannick <yannick.roehlly@...e.fr>
Signed-off-by: Yinghai Lu <yinghai@...nel.org>

diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index ef2c356..a0ba9b1 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -642,7 +642,7 @@ __init void e820_setup_gap(void)
 	while ((gapsize >> 4) > round)
 		round += round;
 	/* Fun with two's complement */
-	pci_mem_start = (gapstart + round) & -round;
+	pci_mem_start = roundup(gapstart, round);
 
 	printk(KERN_INFO
 	       "Allocating PCI resources starting at %lx (gap: %lx:%lx)\n",
--
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