The bounce buffer logic is included on systems that do not need it.
If a system does not have zones like ZONE_DMA and ZONE_HIGHMEM that
can lead to the use of bounce buffers then there is no need to reserve
memory pools etc etc. This is true f.e. for SGI Altix.
Also nicifies the Makefile and gets rid of the tricky "and" there.
Signed-off-by: Christoph Lameter <[email protected]>
---
include/linux/blkdev.h | 2 +-
mm/Kconfig | 4 ++++
mm/Makefile | 4 +---
3 files changed, 6 insertions(+), 4 deletions(-)
Index: linux-2.6/include/linux/blkdev.h
===================================================================
--- linux-2.6.orig/include/linux/blkdev.h 2007-05-18 15:29:43.000000000 -0700
+++ linux-2.6/include/linux/blkdev.h 2007-05-18 15:32:48.000000000 -0700
@@ -607,7 +607,7 @@ extern unsigned long blk_max_low_pfn, bl
#define BLK_BOUNCE_ANY ((u64)blk_max_pfn << PAGE_SHIFT)
#define BLK_BOUNCE_ISA (ISA_DMA_THRESHOLD)
-#ifdef CONFIG_MMU
+#ifdef CONFIG_BOUNCE
extern int init_emergency_isa_pool(void);
extern void blk_queue_bounce(request_queue_t *q, struct bio **bio);
#else
Index: linux-2.6/mm/Kconfig
===================================================================
--- linux-2.6.orig/mm/Kconfig 2007-05-18 15:31:18.000000000 -0700
+++ linux-2.6/mm/Kconfig 2007-05-18 15:38:25.000000000 -0700
@@ -163,6 +163,10 @@ config ZONE_DMA_FLAG
default "0" if !ZONE_DMA
default "1"
+config BOUNCE
+ def_bool y
+ depends on BLOCK && MMU && (ZONE_DMA || HIGHMEM)
+
config NR_QUICK
int
depends on QUICKLIST
Index: linux-2.6/mm/Makefile
===================================================================
--- linux-2.6.orig/mm/Makefile 2007-05-18 15:27:57.000000000 -0700
+++ linux-2.6/mm/Makefile 2007-05-18 15:33:17.000000000 -0700
@@ -13,9 +13,7 @@ obj-y := bootmem.o filemap.o mempool.o
prio_tree.o util.o mmzone.o vmstat.o backing-dev.o \
$(mmu-y)
-ifeq ($(CONFIG_MMU)$(CONFIG_BLOCK),yy)
-obj-y += bounce.o
-endif
+obj-$(CONFIG_BOUNCE) += bounce.o
obj-$(CONFIG_SWAP) += page_io.o swap_state.o swapfile.o thrash.o
obj-$(CONFIG_HUGETLBFS) += hugetlb.o
obj-$(CONFIG_NUMA) += mempolicy.o
-
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