Alexey Dobriyan 41089b6d3e proc: save 2 atomic ops on write to "/proc/*/attr/*" ...

Code checks if write is done by current to its own attributes.
For that get/put pair is unnecessary as it can be done under RCU.

Note: rcu_read_unlock() can be done even earlier since pointer to a task
is not dereferenced. It depends if /proc code should look scary or not:

	rcu_read_lock();
	task = pid_task(...);
	rcu_read_unlock();
	if (!task)
		return -ESRCH;
	if (task != current)
		return -EACCESS:

P.S.: rename "length" variable.	Code like this

	length = -EINVAL;

should not exist.

Link: http://lkml.kernel.org/r/20180627200218.GF18113@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2018-08-22 10:52:45 -07:00

..

array.c

proc: use "unsigned int" for sigqueue length

2018-06-07 17:34:38 -07:00

base.c

proc: save 2 atomic ops on write to "/proc/*/attr/*"

2018-08-22 10:52:45 -07:00

cmdline.c

proc: introduce proc_create_single{,_data}

2018-05-16 07:23:35 +02:00

consoles.c

proc: introduce proc_create_seq{,_data}

2018-05-16 07:23:35 +02:00

cpuinfo.c

x86 / CPU: Always show current CPU frequency in /proc/cpuinfo

2017-11-15 19:46:50 +01:00

devices.c

proc: introduce proc_create_seq{,_data}

2018-05-16 07:23:35 +02:00

fd.c

proc: use "unsigned int" in proc_fill_cache()

2018-06-07 17:34:38 -07:00

fd.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

generic.c

proc: smaller readlock section in readdir("/proc")

2018-08-22 10:52:45 -07:00

inode.c

proc: fixup PDE allocation bloat

2018-08-22 10:52:45 -07:00

internal.h

proc: fixup PDE allocation bloat

2018-08-22 10:52:45 -07:00

interrupts.c

proc: introduce proc_create_seq{,_data}

2018-05-16 07:23:35 +02:00

Kconfig

vmcore: add API to collect hardware dump in second kernel

2018-05-14 13:46:04 -04:00

kcore.c

proc/kcore: don't bounds check against address 0

2018-05-11 17:28:45 -07:00

kmsg.c

vfs: do bulk POLL* -> EPOLL* replacement

2018-02-11 14:34:03 -08:00

loadavg.c

proc: introduce proc_create_single{,_data}

2018-05-16 07:23:35 +02:00

Makefile

proc: : uninline name_to_int()

2017-11-17 16:10:00 -08:00

meminfo.c

/proc/meminfo: add percpu populated pages count

2018-08-22 10:52:45 -07:00

namespaces.c

procfs: switch instantiate_t to d_splice_alias()

2018-05-26 14:20:50 -04:00

nommu.c

proc: introduce proc_create_seq{,_data}

2018-05-16 07:23:35 +02:00

page.c

mm: mark pages in use for page tables

2018-06-07 17:34:37 -07:00

proc_net.c

proc: Add a way to make network proc files writable

2018-05-18 11:46:15 +01:00

proc_sysctl.c

treewide: kzalloc() -> kcalloc()

2018-06-12 16:19:22 -07:00

proc_tty.c

tty: replace ->proc_fops with ->proc_show

2018-05-16 07:24:30 +02:00

root.c

proc: Make inline name size calculation automatic

2018-06-15 00:48:57 -04:00

self.c

proc: introduce a proc_pid_ns helper

2018-05-16 07:23:35 +02:00

softirqs.c

proc: introduce proc_create_single{,_data}

2018-05-16 07:23:35 +02:00

stat.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

task_mmu.c

mm: /proc/pid/smaps_rollup: convert to single value seq_file

2018-08-22 10:52:44 -07:00

task_nommu.c

mm: /proc/pid/*maps remove is_pid and related wrappers

2018-08-22 10:52:44 -07:00

thread_self.c

proc: introduce a proc_pid_ns helper

2018-05-16 07:23:35 +02:00

uptime.c

fs/proc/uptime.c: use ktime_get_boottime_ts64

2018-08-22 10:52:45 -07:00

util.c

proc: use do-while in name_to_int()

2017-11-17 16:10:00 -08:00

version.c

proc: introduce proc_create_single{,_data}

2018-05-16 07:23:35 +02:00

vmcore.c

vmcore: move get_vmcore_size out of __init

2018-05-21 12:34:22 -04:00