linux-kernel - [PATCH] i386: reduce boot fixmap space

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Message-Id: <4880A8AC.76E4.0078.0@novell.com>
Date:	Fri, 18 Jul 2008 13:29:00 +0100
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	<mingo@...e.hu>, <tglx@...utronix.de>, <hpa@...or.com>
Cc:	<linux-kernel@...r.kernel.org>
Subject: [PATCH] i386: reduce boot fixmap space

As 256 entries are needed, aligning to a 256-entry boundary is
sufficient and still guarantees the single pte table requirement.

Signed-off-by: Jan Beulich <jbeulich@...ell.com>

---
 include/asm-x86/fixmap_32.h |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- linux-2.6.26/include/asm-x86/fixmap_32.h	2008-07-13 23:51:29.000000000 +0200
+++ 2.6.26-i386-btmap-fixmaps/include/asm-x86/fixmap_32.h	2008-07-18 13:51:16.000000000 +0200
@@ -94,13 +94,13 @@ enum fixed_addresses {
 	 * 256 temporary boot-time mappings, used by early_ioremap(),
 	 * before ioremap() is functional.
 	 *
-	 * We round it up to the next 512 pages boundary so that we
+	 * We round it up to the next 256 pages boundary so that we
 	 * can have a single pgd entry and a single pte table:
 	 */
 #define NR_FIX_BTMAPS		64
 #define FIX_BTMAPS_NESTING	4
-	FIX_BTMAP_END = __end_of_permanent_fixed_addresses + 512 -
-			(__end_of_permanent_fixed_addresses & 511),
+	FIX_BTMAP_END = __end_of_permanent_fixed_addresses + 256 -
+			(__end_of_permanent_fixed_addresses & 255),
 	FIX_BTMAP_BEGIN = FIX_BTMAP_END + NR_FIX_BTMAPS*FIX_BTMAPS_NESTING - 1,
 	FIX_WP_TEST,
 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT



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