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Akinobu Mita d7be003a9d cma: make default CMA area size zero for x86 
This makes CMA memory area size zero for x86 in default configuration
(doesn't change on the other architectures).  If default CMA size is
zero, DMA_CMA is disabled.  It can be enabled by passing cma= to the
kernel.

This makes less impact on x86.  Because there is no mainline driver that
requires it for x86, and Peter Hurley reported the performance
regression, as this is trying to drive _all_ dma mapping allocations
through a _very_ small window.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Reported-by: Peter Hurley <peter@hurleysoftware.com>
Cc: Peter Hurley <peter@hurleysoftware.com>
Cc: Chuck Ebbert <cebbert.lkml@gmail.com>
Cc: Jean Delvare <jdelvare@suse.de>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Don Dutile <ddutile@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-12-10 17:41:06 -08:00
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accessibility
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acpi
ACPI / video: update condition to check if device is in _DOD list
2014-12-01 02:09:18 +01:00
amba
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ata
Merge tag 'scsi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
2014-12-08 21:19:19 -08:00
atm
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auxdisplay
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base
cma: make default CMA area size zero for x86
2014-12-10 17:41:06 -08:00
bcma
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block
Merge remote-tracking branch 'scsi-queue/core-for-3.19' into for-linus
2014-12-08 07:40:20 -08:00
bluetooth
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bus
Merge tag 'drivers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
2014-12-09 14:48:22 -08:00
cdrom
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char
Merge tag 'asm-generic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic
2014-12-09 17:25:00 -08:00
clk
Merge tag 'drivers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
2014-12-09 14:48:22 -08:00
clocksource
Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2014-12-10 08:18:32 -08:00
connector
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cpufreq
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cpuidle
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crypto
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dca
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devfreq
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dio
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dma
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dma-buf
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edac
Merge tag 'edac_for_3.19' of git://git.kernel.org/pub/scm/linux/kernel/git/bp/bp
2014-12-08 20:17:49 -08:00
eisa
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extcon
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firewire
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firmware
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fmc
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gpio
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gpu
Merge tag 'drm-intel-fixes-2014-12-04' of git://anongit.freedesktop.org/drm-intel into drm-fixes
2014-12-05 11:12:29 +10:00
hid
Merge tag 'mfd-for-linus-3.19' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd
2014-12-08 20:02:54 -08:00
hsi
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hv
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hwmon
hwmon: (tmp401) Detect TMP435 on all addresses it supports
2014-12-08 06:48:37 -08:00
hwspinlock
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i2c
Merge tag 'mfd-for-linus-3.19' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd
2014-12-08 20:02:54 -08:00
ide
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idle
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iio
Merge tag 'mfd-for-linus-3.19' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd
2014-12-08 20:02:54 -08:00
infiniband
Merge remote-tracking branch 'scsi-queue/drivers-for-3.19' into for-linus
2014-12-08 07:42:25 -08:00
input
drivers/input/evdev.c: don't kfree() a vmalloc address
2014-12-03 09:35:38 -08:00
iommu
Merge branch 'irq-irqdomain-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2014-12-10 09:01:01 -08:00
ipack
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irqchip
Merge branch 'irq-irqdomain-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2014-12-10 09:01:01 -08:00
isdn
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leds
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lguest
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macintosh
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mailbox
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mcb
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md
Merge tag 'dm-3.19-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm
2014-12-08 21:10:03 -08:00
media
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memory
Merge tag 'omap-gpmc-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
2014-12-09 16:57:56 -08:00
memstick
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message
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mfd
Merge tag 'mfd-for-linus-3.19' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd
2014-12-08 20:02:54 -08:00
misc
Merge tag 'cleanup-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
2014-12-09 14:18:35 -08:00
mmc
mmc: sdhci-msm: Convert to mmc_send_tuning()
2014-12-08 09:21:06 +01:00
mtd
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net
Merge tag 'at91-cleanup-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
2014-12-09 14:17:12 -08:00
nfc
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ntb
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nubus
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of
Merge branch 'irq-irqdomain-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2014-12-10 09:01:01 -08:00
oprofile
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parisc
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parport
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pci
Merge branch 'irq-irqdomain-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2014-12-10 09:01:01 -08:00
pcmcia
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phy
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pinctrl
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platform
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pnp
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power
Merge tag 'soc-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
2014-12-09 14:38:28 -08:00
powercap
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pps
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ps3
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ptp
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pwm
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rapidio
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ras
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regulator
Merge tag 'regulator-v3.19' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator
2014-12-08 20:42:41 -08:00
remoteproc
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reset
Merge tag 'reset-for-3.19-2' of git://git.pengutronix.de/git/pza/linux into next/drivers
2014-12-04 16:57:36 +01:00
rpmsg
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rtc
Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2014-12-10 08:18:32 -08:00
s390
Merge remote-tracking branch 'scsi-queue/drivers-for-3.19' into for-linus
2014-12-08 07:42:25 -08:00
sbus
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scsi
Merge remote-tracking branch 'scsi-queue/drivers-for-3.19' into for-linus
2014-12-08 07:42:25 -08:00
sfi
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sh
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sn
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soc
Merge tag 'drivers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
2014-12-09 14:48:22 -08:00
spi
Merge remote-tracking branches 'spi/fix/dw' and 'spi/fix/sirf' into spi-linus
2014-11-26 19:05:25 +00:00
spmi
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ssb
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staging
Merge tag 'dt-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
2014-12-09 14:57:37 -08:00
target
Merge remote-tracking branch 'scsi-queue/drivers-for-3.19' into for-linus
2014-12-08 07:42:25 -08:00
tc
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thermal
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thunderbolt
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tty
Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2014-12-09 21:21:34 -08:00
uio
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usb
Merge remote-tracking branch 'scsi-queue/drivers-for-3.19' into for-linus
2014-12-08 07:42:25 -08:00
uwb
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vfio
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vhost
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video
Merge tag 'at91-cleanup-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
2014-12-09 14:17:12 -08:00
virt
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virtio
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vlynq
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vme
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w1
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watchdog
Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2014-12-10 08:18:32 -08:00
xen
Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
2014-12-09 13:12:47 -08:00
zorro
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Kconfig
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Makefile
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