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1d5b43bfb6
linux/drivers
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Luis Henriques 1d5b43bfb6 zram: introduce comp algorithm fallback functionality 
When the user supplies an unsupported compression algorithm, keep the
previously selected one (knowingly supported) or the default one (if the
compression algorithm hasn't been changed yet).

Note that previously this operation (i.e. setting an invalid algorithm)
would result in no algorithm being selected, which means that this
represents a small change in the default behaviour.

Minchan said:

For initializing zram, we need to set up 3 optional parameters in advance.

1. the number of compression streams
2. memory limitation
3. compression algorithm

Although user pass completely wrong value to set up for 1 and 2
parameters, it's okay because they have default value so zram will be
initialized with the default value (of course, when user passes a wrong
value via *echo*, sysfs returns -EINVAL so the user can notice it).

But 3 is not consistent with other optional parameters.  IOW, if the
user passes a wrong value to set up 3 parameter, zram's initialization
would fail unlike other optional parameters.

So this patch makes them consistent.

Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Acked-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-11-06 17:50:42 -08:00
..
accessibility
acpi driver core update for 4.4-rc1 2015-11-04 21:50:37 -08:00
amba
android
ata Merge branch 'for-4.3-fixes' into for-4.4 2015-11-03 17:29:03 -05:00
atm
auxdisplay
base The majority of the changes are driver updates and new device 2015-11-05 12:59:36 -08:00
bcma
block zram: introduce comp algorithm fallback functionality 2015-11-06 17:50:42 -08:00
bluetooth driver core update for 4.4-rc1 2015-11-04 21:50:37 -08:00
bus
cdrom
char powerpc updates for 4.4 2015-11-05 23:38:43 -08:00
clk powerpc updates for 4.4 2015-11-05 23:38:43 -08:00
clocksource Power management and ACPI updates for v4.4-rc1 2015-11-04 18:10:13 -08:00
connector mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd 2015-11-06 17:50:42 -08:00
cpufreq Merge branch 'pm-opp' 2015-11-02 00:54:37 +01:00
cpuidle
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2015-11-04 09:11:12 -08:00
dca
devfreq
dio
dma char/misc drivers for 4.4-rc1 2015-11-04 22:15:15 -08:00
dma-buf
edac Merge branch 'ras-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-11-03 17:51:33 -08:00
eisa
extcon
firewire mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd 2015-11-06 17:50:42 -08:00
firmware Half dozen small cleanups plus change to allow pstore 2015-11-05 11:51:18 -08:00
fmc
fpga fpga: socfpga: Fix check of return value of devm_request_irq 2015-10-29 15:20:25 -07:00
gpio spi: Updates for v4.4 2015-11-05 13:15:12 -08:00
gpu mm, fs: introduce mapping_gfp_constraint() 2015-11-06 17:50:42 -08:00
hid
hsi hsi: controllers:remove redundant code 2015-10-30 16:10:40 +01:00
hv drivers/hv: share Hyper-V SynIC constants with userspace 2015-11-04 16:24:33 +01:00
hwmon spi: Updates for v4.4 2015-11-05 13:15:12 -08:00
hwspinlock
hwtracing
i2c
ide mm, page_alloc: rename __GFP_WAIT to __GFP_RECLAIM 2015-11-06 17:50:42 -08:00
idle
iio spi: Updates for v4.4 2015-11-05 13:15:12 -08:00
infiniband mm, page_alloc: rename __GFP_WAIT to __GFP_RECLAIM 2015-11-06 17:50:42 -08:00
input spi: Updates for v4.4 2015-11-05 13:15:12 -08:00
iommu mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd 2015-11-06 17:50:42 -08:00
ipack
irqchip Power management and ACPI updates for v4.4-rc1 2015-11-04 18:10:13 -08:00
isdn TTY/Serial driver patches for 4.4-rc1 2015-11-04 21:35:12 -08:00
leds spi: Updates for v4.4 2015-11-05 13:15:12 -08:00
lguest
lightnvm lightnvm: refactor phys addrs type to u64 2015-11-03 09:53:24 -07:00
macintosh
mailbox
mcb mcb: Destroy IDA on module unload 2015-10-29 09:02:16 +09:00
md mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd 2015-11-06 17:50:42 -08:00
media mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd 2015-11-06 17:50:42 -08:00
memory char/misc drivers for 4.4-rc1 2015-11-04 22:15:15 -08:00
memstick
message
mfd mfd: avoid newly introduced compiler warning 2015-11-06 10:47:12 -08:00
misc mm, page_alloc: rename __GFP_WAIT to __GFP_RECLAIM 2015-11-06 17:50:42 -08:00
mmc spi: Updates for v4.4 2015-11-05 13:15:12 -08:00
mtd mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd 2015-11-06 17:50:42 -08:00
net mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd 2015-11-06 17:50:42 -08:00
nfc spi: Updates for v4.4 2015-11-05 13:15:12 -08:00
ntb
nubus
nvdimm
nvme mm, page_alloc: rename __GFP_WAIT to __GFP_RECLAIM 2015-11-06 17:50:42 -08:00
nvmem
of driver core update for 4.4-rc1 2015-11-04 21:50:37 -08:00
oprofile
parisc
parport
pci Power management and ACPI updates for v4.4-rc1 2015-11-04 18:10:13 -08:00
pcmcia
perf arm64 updates for 4.4: 2015-11-04 14:47:13 -08:00
phy USB patches for 4.4-rc1 2015-11-04 21:26:27 -08:00
pinctrl This is the bulk of GPIO changes for v4.4: 2015-11-02 12:59:12 -08:00
platform - New Device Support 2015-11-06 10:23:50 -08:00
pnp
power - New Device Support 2015-11-06 10:23:50 -08:00
powercap
pps
ps3
ptp
pwm
rapidio
ras
regulator spi: Updates for v4.4 2015-11-05 13:15:12 -08:00
remoteproc
reset
rpmsg
rtc
s390 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2015-11-04 11:31:31 -08:00
sbus
scsi mm, page_alloc: rename __GFP_WAIT to __GFP_RECLAIM 2015-11-06 17:50:42 -08:00
sfi
sh
sn
soc
spi Merge remote-tracking branches 'spi/topic/s3c64xx', 'spi/topic/ti-qspi' and 'spi/topic/txx9' into spi-next 2015-11-04 11:02:16 +00:00
spmi char/misc drivers for 4.4-rc1 2015-11-04 22:15:15 -08:00
ssb
staging mm, page_alloc: rename __GFP_WAIT to __GFP_RECLAIM 2015-11-06 17:50:42 -08:00
target
tc
thermal
thunderbolt
tty spi: Updates for v4.4 2015-11-05 13:15:12 -08:00
uio
usb mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd 2015-11-06 17:50:42 -08:00
uwb driver core update for 4.4-rc1 2015-11-04 21:50:37 -08:00
vfio
vhost
video mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd 2015-11-06 17:50:42 -08:00
virt
virtio
vlynq
vme char/misc drivers for 4.4-rc1 2015-11-04 22:15:15 -08:00
w1 power supply and reset changes for the v4.4 series 2015-11-05 12:28:15 -08:00
watchdog
xen
zorro
Kconfig char/misc drivers for 4.4-rc1 2015-11-04 22:15:15 -08:00
Makefile char/misc drivers for 4.4-rc1 2015-11-04 22:15:15 -08:00