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kernel, fs: Introduce and use set_restart_fn() and arch_set_restart_data()

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Preparation for fixing get_nr_restart_syscall() on X86 for COMPAT.

Add a new helper which sets restart_block->fn and calls a dummy
arch_set_restart_data() helper.

Fixes: 609c19a385 ("x86/ptrace: Stop setting TS_COMPAT in ptrace code")
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20210201174641.GA17871@redhat.com
This commit is contained in:
Oleg Nesterov 2021-02-01 18:46:41 +01:00 • committed by Thomas Gleixner
parent 1e28eed176
commit 5abbe51a52
6 changed files with 21 additions and 11 deletions
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2
kernel/time/alarmtimer.c
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@ -854,9 +854,9 @@ static int alarm_timer_nsleep(const clockid_t which_clock, int flags,
if (flags == TIMER_ABSTIME)
return -ERESTARTNOHAND;
restart->fn = alarm_timer_nsleep_restart;
restart->nanosleep.clockid = type;
restart->nanosleep.expires = exp;
set_restart_fn(restart, alarm_timer_nsleep_restart);
return ret;
}