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Subject[PATCH 2/2] 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.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
---
fs/select.c | 46 +++++++++++++---------------------------------
1 file changed, 13 insertions(+), 33 deletions(-)

diff --git a/fs/select.c b/fs/select.c
index 57712c3..51ceec2 100644
--- a/fs/select.c
+++ b/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 __user *inp, fd_set __user *outp,
}

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 __user *inp, fd_set __user *outp,
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 __user *, ufds, unsigned int, nfds,
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 pollfd __user *, ufds, unsigned int, nfds,
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, compat_ulong_t __user *inp,
}

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, compat_ulong_t __user *inp,
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, struct pollfd __user *, ufds,
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, struct pollfd __user *, ufds,
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
--
2.5.0

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