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block: remove old blk_iopoll_enabled variable

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This was a debugging measure to toggle enabled/disabled
when testing. But for real production setups, it's not
safe to toggle this setting without either reloading
drivers of quiescing IO first. Neither of which the toggle
enforces.

Additionally, it makes drivers deal with the conditional
state.

Remove it completely. It's up to the driver whether iopoll
is enabled or not.

Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jens Axboe 2014-03-13 09:38:42 -06:00
parent af5040da01
commit 89f8b33ca1
5 changed files with 68 additions and 170 deletions
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12
kernel/sysctl.c
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@ -112,9 +112,6 @@ extern int sysctl_nr_open_min, sysctl_nr_open_max;
#ifndef CONFIG_MMU
extern int sysctl_nr_trim_pages;
#endif
#ifdef CONFIG_BLOCK
extern int blk_iopoll_enabled;
#endif
/* Constants used for minimum and maximum */
#ifdef CONFIG_LOCKUP_DETECTOR
@ -1093,15 +1090,6 @@ static struct ctl_table kern_table[] = {
.mode = 0644,
.proc_handler = proc_dointvec,
},
#endif
#ifdef CONFIG_BLOCK
{
.procname = "blk_iopoll",
.data = &blk_iopoll_enabled,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
#endif
{ }
};