path: root/arch/x86/kernel/head32.c
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authorDavid Rientjes <rientjes@google.com>2011-05-16 13:54:10 -0700
committerH. Peter Anvin <hpa@linux.intel.com>2011-05-16 14:03:28 -0700
commitdc382fd5bcca7098a984705ed6ac880f539d068e (patch)
treec1e3cba89fcb91092061fecd5a2d688335e30216 /arch/x86/kernel/head32.c
parente5a10c1bd12a5d71bbb6406c1b0dbbc9d8958397 (diff)
x86, mm: Allow ZONE_DMA to be configurable
ZONE_DMA is unnecessary for a large number of machines that do not require less than 32-bit DMA addressing, e.g. ISA legacy DMA or PCI cards with a restricted DMA address mask. This patch allows users to disable ZONE_DMA for x86 if they know they will not be using such devices with their kernel. This prevents the VM from unnecessarily reserving a ratio of memory (defaulting to 1/256th of system capacity) with lowmem_reserve_ratio for such allocations when it will never be used. Signed-off-by: David Rientjes <rientjes@google.com> Link: http://lkml.kernel.org/r/alpine.DEB.2.00.1105161353560.4353@chino.kir.corp.google.com Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/kernel/head32.c')
0 files changed, 0 insertions, 0 deletions

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