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74e37200de
linux/fs/proc
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Oleg Nesterov 74e37200de proc: cleanup/simplify get_task_state/task_state_array 
get_task_state() and task_state_array[] look confusing and suboptimal, it
is not clear what it can actually report to user-space and
task_state_array[] blows .data for no reason.

1. state = (tsk->state & TASK_REPORT) | tsk->exit_state is not
   clear. TASK_REPORT is self-documenting but it is not clear
   what ->exit_state can add.

   Move the potential exit_state's (EXIT_ZOMBIE and EXIT_DEAD)
   into TASK_REPORT and use it to calculate the final result.

2. With the change above it is obvious that task_state_array[]
   has the unused entries just to make BUILD_BUG_ON() happy.

   Change this BUILD_BUG_ON() to use TASK_REPORT rather than
   TASK_STATE_MAX and shrink task_state_array[].

3. Turn the "while (state)" loop into fls(state).

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: David Laight <David.Laight@ACULAB.COM>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-01-23 16:37:01 -08:00
..
array.c proc: cleanup/simplify get_task_state/task_state_array 2014-01-23 16:37:01 -08:00
base.c audit: allow unsetting the loginuid (with priv) 2013-11-05 11:08:09 -05:00
cmdline.c
consoles.c seq_file: remove "%n" usage from seq_file users 2013-11-15 09:32:20 +09:00
cpuinfo.c
devices.c proc: use seq_puts()/seq_putc() where possible 2011-01-13 08:03:16 -08:00
fd.c proc: make proc_fd_permission() thread-friendly 2013-09-11 15:59:03 -07:00
fd.h proc: Move proc_fd() to fs/proc/fd.h 2013-05-01 17:29:39 -04:00
generic.c consolidate simple ->d_delete() instances 2013-11-15 22:04:17 -05:00
inode.c procfs: also fix proc_reg_get_unmapped_area() for !MMU case 2013-12-12 18:19:26 -08:00
internal.h proc_fill_cache(): just make instantiate_t return int 2013-06-29 12:57:18 +04:00
interrupts.c
Kconfig kcore: add Kconfig help text 2013-11-13 12:09:33 +09:00
kcore.c mm: use pgdat_end_pfn() to simplify the code in others 2013-11-13 12:09:03 +09:00
kmsg.c kmsg: honor dmesg_restrict sysctl on /dev/kmsg 2013-06-12 16:29:44 -07:00
loadavg.c
Makefile mm, vmalloc: move get_vmalloc_info() to vmalloc.c 2013-04-29 15:54:33 -07:00
meminfo.c /proc/meminfo: provide estimated available memory 2014-01-21 16:19:43 -08:00
namespaces.c consolidate simple ->d_delete() instances 2013-11-15 22:04:17 -05:00
nommu.c seq_file: remove "%n" usage from seq_file users 2013-11-15 09:32:20 +09:00
page.c fs/proc/page.c: add PageAnon check to surely detect thp 2014-01-23 16:36:50 -08:00
proc_devtree.c of: remove HAVE_ARCH_DEVTREE_FIXUPS 2013-10-09 20:04:08 -05:00
proc_net.c [readdir] convert procfs 2013-06-29 12:56:32 +04:00
proc_sysctl.c Don't pass inode to ->d_hash() and ->d_compare() 2013-06-29 12:57:36 +04:00
proc_tty.c proc: use seq_puts()/seq_putc() where possible 2011-01-13 08:03:16 -08:00
root.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2013-09-07 14:35:32 -07:00
self.c new helper: kfree_put_link() 2013-10-24 23:34:49 -04:00
softirqs.c proc: use seq_puts()/seq_putc() where possible 2011-01-13 08:03:16 -08:00
stat.c stat: Use size_t for sizes instead of unsigned 2013-02-01 12:32:08 +02:00
task_mmu.c seq_file: remove "%n" usage from seq_file users 2013-11-15 09:32:20 +09:00
task_nommu.c seq_file: remove "%n" usage from seq_file users 2013-11-15 09:32:20 +09:00
uptime.c fs/proc/uptime.c:uptime_proc_show(): use get_monotonic_boottime() 2013-07-03 16:08:02 -07:00
version.c
vmcore.c vmcore: enable /proc/vmcore mmap for s390 2013-09-11 15:59:14 -07:00