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authorChristoph Lameter <clameter@sgi.com>2007-07-17 04:03:37 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-17 10:23:02 -0700
commit2a7326b5bbafac4c96bcdb944b2a773593030b96 (patch)
tree25bc49eadea73cf2133198963d1baf3f5def7316 /mm
parent831441862956fffa17b9801db37e6ea1650b0f69 (diff)
downloadop-kernel-dev-2a7326b5bbafac4c96bcdb944b2a773593030b96.zip
op-kernel-dev-2a7326b5bbafac4c96bcdb944b2a773593030b96.tar.gz
CONFIG_BOUNCE to avoid useless inclusion of bounce buffer logic
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>
Diffstat (limited to 'mm')
-rw-r--r--mm/Kconfig4
-rw-r--r--mm/Makefile4
2 files changed, 5 insertions, 3 deletions
diff --git a/mm/Kconfig b/mm/Kconfig
index 086af70..8618722 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -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
diff --git a/mm/Makefile b/mm/Makefile
index a9148ea..245e33a 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -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
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