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99f667352f
linux/drivers/char
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Christoph Hellwig 99f667352f /dev/zero: also implement ->read 
Christophe reported a major speedup due to avoiding the iov_iter
overhead, so just add this trivial function.  Note that /dev/zero
already implements both an iter and non-iter writes so this just
makes it more symmetric.

Tested-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20200903155922.1111551-1-hch@lst.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-09-03 19:50:47 +02:00
..
agp treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
hw_random crypto: ingenic - Drop kfree for memory allocated with devm_kzalloc 2020-08-21 14:43:51 +10:00
ipmi treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
mwave char/mwave: remove redundant initialization of variable bRC 2020-07-10 14:50:51 +02:00
pcmcia cm4000_cs.c cmm_ioctl(): get rid of pointless access_ok() 2020-05-29 11:04:56 -04:00
tpm ARM: SoC driver updates for v5.9 2020-08-03 19:30:59 -07:00
xilinx_hwicap treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
xillybus char: xillybus: use devm_platform_ioremap_resource() to simplify code 2019-11-05 18:29:21 +01:00
adi.c
apm-emulation.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
applicom.c misc: cleanup minor number definitions in c file into miscdevice.h 2020-03-18 12:27:03 +01:00
applicom.h
bsr.c mm: don't include asm/pgtable.h if linux/mm.h is already included 2020-06-09 09:39:13 -07:00
ds1620.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
dsp56k.c
dtlk.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
hangcheck-timer.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 405 2019-06-05 17:37:13 +02:00
hpet.c char: hpet: Fix out-of-bounds read bug 2020-01-30 06:58:33 +01:00
Kconfig char: Replace HTTP links with HTTPS ones 2020-07-23 09:44:15 +02:00
lp.c Merge 5.9-rc3 into char-misc-next 2020-08-31 07:17:17 +02:00
Makefile rtc/alpha: remove legacy rtc driver 2020-03-19 07:41:02 +01:00
mem.c /dev/zero: also implement ->read 2020-09-03 19:50:47 +02:00
misc.c char: misc: Move EXPORT_SYMBOL immediately next to the functions/varibles 2019-05-24 18:00:41 +02:00
mspec.c char: mspec: Use kvzalloc() in mspec_mmap() 2020-08-28 12:10:04 +02:00
nsc_gpio.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
nvram.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
nwbutton.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
nwbutton.h misc: cleanup minor number definitions in c file into miscdevice.h 2020-03-18 12:27:03 +01:00
nwflash.c misc: move FLASH_MINOR into miscdevice.h and fix conflicts 2020-03-18 12:27:04 +01:00
pc8736x_gpio.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
powernv-op-panel.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
ppdev.c ppdev: Distribute switch variables for initialization 2020-02-23 20:28:12 +01:00
ps3flash.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 164 2019-05-30 11:26:38 -07:00
random.c random32: update the net random state on interrupt and activity 2020-07-29 10:35:37 -07:00
raw.c char: raw: do not leak CONFIG_MAX_RAW_DEVS to userspace 2020-07-10 14:50:51 +02:00
scx200_gpio.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
sonypi.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61 2019-05-24 17:36:45 +02:00
tb0219.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
tlclk.c drivers: char: tlclk.c: Avoid data race between init and interrupt handler 2020-04-23 16:55:24 +02:00
toshiba.c misc: cleanup minor number definitions in c file into miscdevice.h 2020-03-18 12:27:03 +01:00
ttyprintk.c ttyprintk: remove redundant initialization of variable ret 2020-07-10 14:50:51 +02:00
uv_mmtimer.c
virtio_console.c Merge v5.8-rc6 into char-misc-next 2020-07-20 09:43:40 +02:00