The patch titled
Subject: select: shift restore_saved_sigmask_unless() into poll_select_copy_remaining()
has been added to the -mm tree. Its filename is
select-shift-restore_saved_sigmask_unless-into-poll_select_copy_remaining.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/select-shift-restore_saved_sigmask_unless-into-poll_select_copy_remaining.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/select-shift-restore_saved_sigmask_unless-into-poll_select_copy_remaining.patch
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Oleg Nesterov <oleg@xxxxxxxxxx>
Subject: select: shift restore_saved_sigmask_unless() into poll_select_copy_remaining()
Now that restore_saved_sigmask_unless() is always called with the same
argument right before poll_select_copy_remaining() we can move it into
poll_select_copy_remaining() and make it the only caller of restore() in
fs/select.c.
The patch also renames poll_select_copy_remaining(), poll_select_finish()
looks better after this change.
kern_select() doesn't use set_user_sigmask(), so in this case
poll_select_finish() does restore_saved_sigmask_unless() "for no reason".
But this won't hurt, and WARN_ON(!TIF_SIGPENDING) is still valid.
Link: http://lkml.kernel.org/r/20190606140915.GC13440@xxxxxxxxxx
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: David Laight <David.Laight@xxxxxxxxxx>
Cc: Davidlohr Bueso <dave@xxxxxxxxxxxx>
Cc: Deepa Dinamani <deepa.kernel@xxxxxxxxx>
Cc: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
Cc: Eric Wong <e@xxxxxxxxx>
Cc: Jason Baron <jbaron@xxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/select.c | 46 +++++++++++++---------------------------------
1 file changed, 13 insertions(+), 33 deletions(-)
--- a/fs/select.c~select-shift-restore_saved_sigmask_unless-into-poll_select_copy_remaining
+++ a/fs/select.c
@@ -294,12 +294,14 @@ enum poll_time_type {
PT_OLD_TIMESPEC = 3,
};
-static int poll_select_copy_remaining(struct timespec64 *end_time,
- void __user *p,
- enum poll_time_type pt_type, int ret)
+static int poll_select_finish(struct timespec64 *end_time,
+ void __user *p,
+ enum poll_time_type pt_type, int ret)
{
struct timespec64 rts;
+ restore_saved_sigmask_unless(ret == -ERESTARTNOHAND);
+
if (!p)
return ret;
@@ -714,9 +716,7 @@ static int kern_select(int n, fd_set __u
}
ret = core_sys_select(n, inp, outp, exp, to);
- ret = poll_select_copy_remaining(&end_time, tvp, PT_TIMEVAL, ret);
-
- return ret;
+ return poll_select_finish(&end_time, tvp, PT_TIMEVAL, ret);
}
SYSCALL_DEFINE5(select, int, n, fd_set __user *, inp, fd_set __user *, outp,
@@ -757,10 +757,7 @@ static long do_pselect(int n, fd_set __u
return ret;
ret = core_sys_select(n, inp, outp, exp, to);
- restore_saved_sigmask_unless(ret == -ERESTARTNOHAND);
- ret = poll_select_copy_remaining(&end_time, tsp, type, ret);
-
- return ret;
+ return poll_select_finish(&end_time, tsp, type, ret);
}
/*
@@ -1102,10 +1099,7 @@ SYSCALL_DEFINE5(ppoll, struct pollfd __u
return ret;
ret = do_sys_poll(ufds, nfds, to);
- restore_saved_sigmask_unless(ret == -ERESTARTNOHAND);
- ret = poll_select_copy_remaining(&end_time, tsp, PT_TIMESPEC, ret);
-
- return ret;
+ return poll_select_finish(&end_time, tsp, PT_TIMESPEC, ret);
}
#if defined(CONFIG_COMPAT_32BIT_TIME) && !defined(CONFIG_64BIT)
@@ -1131,10 +1125,7 @@ SYSCALL_DEFINE5(ppoll_time32, struct pol
return ret;
ret = do_sys_poll(ufds, nfds, to);
- restore_saved_sigmask_unless(ret == -ERESTARTNOHAND);
- ret = poll_select_copy_remaining(&end_time, tsp, PT_OLD_TIMESPEC, ret);
-
- return ret;
+ return poll_select_finish(&end_time, tsp, PT_OLD_TIMESPEC, ret);
}
#endif
@@ -1271,9 +1262,7 @@ static int do_compat_select(int n, compa
}
ret = compat_core_sys_select(n, inp, outp, exp, to);
- ret = poll_select_copy_remaining(&end_time, tvp, PT_OLD_TIMEVAL, ret);
-
- return ret;
+ return poll_select_finish(&end_time, tvp, PT_OLD_TIMEVAL, ret);
}
COMPAT_SYSCALL_DEFINE5(select, int, n, compat_ulong_t __user *, inp,
@@ -1333,10 +1322,7 @@ static long do_compat_pselect(int n, com
return ret;
ret = compat_core_sys_select(n, inp, outp, exp, to);
- restore_saved_sigmask_unless(ret == -ERESTARTNOHAND);
- ret = poll_select_copy_remaining(&end_time, tsp, type, ret);
-
- return ret;
+ return poll_select_finish(&end_time, tsp, type, ret);
}
COMPAT_SYSCALL_DEFINE6(pselect6_time64, int, n, compat_ulong_t __user *, inp,
@@ -1405,10 +1391,7 @@ COMPAT_SYSCALL_DEFINE5(ppoll_time32, str
return ret;
ret = do_sys_poll(ufds, nfds, to);
- restore_saved_sigmask_unless(ret == -ERESTARTNOHAND);
- ret = poll_select_copy_remaining(&end_time, tsp, PT_OLD_TIMESPEC, ret);
-
- return ret;
+ return poll_select_finish(&end_time, tsp, PT_OLD_TIMESPEC, ret);
}
#endif
@@ -1434,10 +1417,7 @@ COMPAT_SYSCALL_DEFINE5(ppoll_time64, str
return ret;
ret = do_sys_poll(ufds, nfds, to);
- restore_saved_sigmask_unless(ret == -ERESTARTNOHAND);
- ret = poll_select_copy_remaining(&end_time, tsp, PT_TIMESPEC, ret);
-
- return ret;
+ return poll_select_finish(&end_time, tsp, PT_TIMESPEC, ret);
}
#endif
_
Patches currently in -mm which might be from oleg@xxxxxxxxxx are
signal-remove-the-wrong-signal_pending-check-in-restore_user_sigmask.patch
signal-simplify-set_user_sigmask-restore_user_sigmask.patch
select-change-do_poll-to-return-erestartnohand-rather-than-eintr.patch
select-shift-restore_saved_sigmask_unless-into-poll_select_copy_remaining.patch
