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CONFIG_BOUNCE to avoid useless inclusion of bounce buffer logic

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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 <clameter@sgi.com>
Acked-by: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Lameter 2007-07-17 04:03:37 -07:00 committed by Linus Torvalds
parent 8314418629
commit 2a7326b5bb
3 changed files with 6 additions and 4 deletions
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2
include/linux/blkdev.h
View File

@ -624,7 +624,7 @@ extern unsigned long blk_max_low_pfn, blk_max_pfn;
*/
#define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
#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

4
mm/Kconfig
View File

@ -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

4
mm/Makefile
View File

@ -13,9 +13,7 @@ obj-y := bootmem.o filemap.o mempool.o oom_kill.o fadvise.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