[PATCH] i386: reduce boot fixmap space

From: Jan Beulich
Date: Fri Jul 18 2008 - 08:28:46 EST


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@xxxxxxxxxx>

---
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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