Messages in this thread | | | Date | Mon, 22 Apr 2013 18:47:12 +0100 | From | Russell King - ARM Linux <> | Subject | Re: [PATCH] mm: add an option to disable bounce |
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On Mon, Apr 22, 2013 at 08:53:00PM +0530, vinayakm.list@gmail.com wrote: > From: Vinayak Menon <vinayakm.list@gmail.com> > > There are times when HIGHMEM is enabled, but > we don't prefer CONFIG_BOUNCE to be enabled. > CONFIG_BOUNCE can reduce the block device > throughput, and this is not ideal for machines > where we don't gain much by enabling it. So > provide an option to deselect CONFIG_BOUNCE. The > observation was made while measuring eMMC throughput > using iozone on an ARM device with 1GB RAM. > > Signed-off-by: Vinayak Menon <vinayakm.list@gmail.com> > --- > mm/Kconfig | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/mm/Kconfig b/mm/Kconfig > index 3bea74f..29f9736 100644 > --- a/mm/Kconfig > +++ b/mm/Kconfig > @@ -263,8 +263,14 @@ config ZONE_DMA_FLAG > default "1" > > config BOUNCE > + bool "Enable bounce buffers" > def_bool y > depends on BLOCK && MMU && (ZONE_DMA || HIGHMEM)
I don't think this is correct. You shouldn't use "bool" with "def_bool". Sure, add the "bool", but also change "def_bool" to "default".
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