[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Thu, 6 Jun 2019 16:08:52 +0200
From: Oleg Nesterov <oleg@...hat.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
Deepa Dinamani <deepa.kernel@...il.com>
Cc: linux-kernel@...r.kernel.org, arnd@...db.de, dbueso@...e.de,
axboe@...nel.dk, dave@...olabs.net, e@...24.org, jbaron@...mai.com,
linux-fsdevel@...r.kernel.org, linux-aio@...ck.org,
omar.kilani@...il.com, tglx@...utronix.de, stable@...r.kernel.org,
Al Viro <viro@...IV.linux.org.uk>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
David Laight <David.Laight@...LAB.COM>
Subject: [PATCH 1/2] select: change do_poll() to return -ERESTARTNOHAND
rather than -EINTR
do_poll() returns -EINTR if interrupted and after that all its callers
have to translate it into -ERESTARTNOHAND. Change do_poll() to return
-ERESTARTNOHAND and update (simplify) the callers.
Note that this also unifies all users of restore_saved_sigmask_unless(),
see the next patch.
Signed-off-by: Oleg Nesterov <oleg@...hat.com>
---
fs/select.c | 30 +++++++-----------------------
1 file changed, 7 insertions(+), 23 deletions(-)
diff --git a/fs/select.c b/fs/select.c
index 1fc1b24..57712c3 100644
--- a/fs/select.c
+++ b/fs/select.c
@@ -925,7 +925,7 @@ static int do_poll(struct poll_list *list, struct poll_wqueues *wait,
if (!count) {
count = wait->error;
if (signal_pending(current))
- count = -EINTR;
+ count = -ERESTARTNOHAND;
}
if (count || timed_out)
break;
@@ -1040,7 +1040,7 @@ static long do_restart_poll(struct restart_block *restart_block)
ret = do_sys_poll(ufds, nfds, to);
- if (ret == -EINTR) {
+ if (ret == -ERESTARTNOHAND) {
restart_block->fn = do_restart_poll;
ret = -ERESTART_RESTARTBLOCK;
}
@@ -1061,7 +1061,7 @@ SYSCALL_DEFINE3(poll, struct pollfd __user *, ufds, unsigned int, nfds,
ret = do_sys_poll(ufds, nfds, to);
- if (ret == -EINTR) {
+ if (ret == -ERESTARTNOHAND) {
struct restart_block *restart_block;
restart_block = ¤t->restart_block;
@@ -1102,11 +1102,7 @@ SYSCALL_DEFINE5(ppoll, struct pollfd __user *, ufds, unsigned int, nfds,
return ret;
ret = do_sys_poll(ufds, nfds, to);
-
- restore_saved_sigmask_unless(ret == -EINTR);
- /* We can restart this syscall, usually */
- if (ret == -EINTR)
- ret = -ERESTARTNOHAND;
+ restore_saved_sigmask_unless(ret == -ERESTARTNOHAND);
ret = poll_select_copy_remaining(&end_time, tsp, PT_TIMESPEC, ret);
return ret;
@@ -1135,11 +1131,7 @@ 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 == -EINTR);
- /* We can restart this syscall, usually */
- if (ret == -EINTR)
- ret = -ERESTARTNOHAND;
+ restore_saved_sigmask_unless(ret == -ERESTARTNOHAND);
ret = poll_select_copy_remaining(&end_time, tsp, PT_OLD_TIMESPEC, ret);
return ret;
@@ -1413,11 +1405,7 @@ COMPAT_SYSCALL_DEFINE5(ppoll_time32, struct pollfd __user *, ufds,
return ret;
ret = do_sys_poll(ufds, nfds, to);
-
- restore_saved_sigmask_unless(ret == -EINTR);
- /* We can restart this syscall, usually */
- if (ret == -EINTR)
- ret = -ERESTARTNOHAND;
+ restore_saved_sigmask_unless(ret == -ERESTARTNOHAND);
ret = poll_select_copy_remaining(&end_time, tsp, PT_OLD_TIMESPEC, ret);
return ret;
@@ -1446,11 +1434,7 @@ COMPAT_SYSCALL_DEFINE5(ppoll_time64, struct pollfd __user *, ufds,
return ret;
ret = do_sys_poll(ufds, nfds, to);
-
- restore_saved_sigmask_unless(ret == -EINTR);
- /* We can restart this syscall, usually */
- if (ret == -EINTR)
- ret = -ERESTARTNOHAND;
+ restore_saved_sigmask_unless(ret == -ERESTARTNOHAND);
ret = poll_select_copy_remaining(&end_time, tsp, PT_TIMESPEC, ret);
return ret;
--
2.5.0
Powered by blists - more mailing lists