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time/posix-timers: Move the compat copyouts to the nanosleep implementations

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Turn restart_block.nanosleep.{rmtp,compat_rmtp} into a tagged union (kind =
1 -> native, kind = 2 -> compat, kind = 0 -> nothing) and make the places
doing actual copyout handle compat as well as native (that will become a
helper in the next commit).  Result: compat wrappers, messing with
reassignments, etc. are gone.

[ tglx: Folded in a variant of Peter Zijlstras enum patch ]

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20170607084241.28657-6-viro@ZenIV.linux.org.uk
This commit is contained in:
Al Viro
2017-06-07 09:42:31 +01:00
committed by Thomas Gleixner
parent 99e6c0e6ec
commit edbeda4632
8 changed files with 142 additions and 171 deletions
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16
kernel/time/alarmtimer.c
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@@ -27,6 +27,7 @@
#include <linux/posix-timers.h>
#include <linux/workqueue.h>
#include <linux/freezer.h>
#include <linux/compat.h>
#include "posix-timers.h"
@@ -691,7 +692,7 @@ static enum alarmtimer_restart alarmtimer_nsleep_wakeup(struct alarm *alarm,
static int alarmtimer_do_nsleep(struct alarm *alarm, ktime_t absexp,
enum alarmtimer_type type)
{
struct timespec __user *rmtp;
struct restart_block *restart;
alarm->data = (void *)current;
do {
set_current_state(TASK_INTERRUPTIBLE);
@@ -709,8 +710,8 @@ static int alarmtimer_do_nsleep(struct alarm *alarm, ktime_t absexp,
if (freezing(current))
alarmtimer_freezerset(absexp, type);
rmtp = current->restart_block.nanosleep.rmtp;
if (rmtp) {
restart = &current->restart_block;
if (restart->nanosleep.type != TT_NONE) {
struct timespec rmt;
ktime_t rem;
@@ -720,7 +721,14 @@ static int alarmtimer_do_nsleep(struct alarm *alarm, ktime_t absexp,
return 0;
rmt = ktime_to_timespec(rem);
if (copy_to_user(rmtp, &rmt, sizeof(*rmtp)))
#ifdef CONFIG_COMPAT
if (restart->nanosleep.type == TT_COMPAT) {
if (compat_put_timespec(&rmt,
restart->nanosleep.compat_rmtp))
return -EFAULT;
} else
#endif
if (copy_to_user(restart->nanosleep.rmtp, &rmt, sizeof(rmt)))
return -EFAULT;
}
return -ERESTART_RESTARTBLOCK;