From: Dmitry Safonov <dima@arista.com>
To: linux-kernel@vger.kernel.org
Cc: Dmitry Safonov <0x7f454c46@gmail.com>,
Dmitry Safonov <dima@arista.com>, Adrian Reber <adrian@lisas.de>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Andrei Vagin <avagin@openvz.org>,
Andy Lutomirski <luto@kernel.org>,
Cyrill Gorcunov <gorcunov@openvz.org>,
Ingo Molnar <mingo@redhat.com>, Oleg Nesterov <oleg@redhat.com>,
Pavel Emelyanov <xemul@virtuozzo.com>,
Thomas Gleixner <tglx@linutronix.de>,
containers@lists.linux-foundation.org,
linux-fsdevel@vger.kernel.org
Subject: [PATCH 8/9] select/restart_block: Convert poll's timeout to u64
Date: Mon, 9 Sep 2019 11:23:39 +0100 [thread overview]
Message-ID: <20190909102340.8592-9-dima@arista.com> (raw)
In-Reply-To: <20190909102340.8592-1-dima@arista.com>
All preparations have been done - now poll() can set u64 timeout in
restart_block. It allows to do the next step - unifying all timeouts in
restart_block and provide ptrace() API to read it.
Signed-off-by: Dmitry Safonov <dima@arista.com>
---
fs/select.c | 27 +++++++--------------------
include/linux/restart_block.h | 4 +---
2 files changed, 8 insertions(+), 23 deletions(-)
diff --git a/fs/select.c b/fs/select.c
index 4af88feaa2fe..ff2b9c4865cd 100644
--- a/fs/select.c
+++ b/fs/select.c
@@ -1001,14 +1001,9 @@ static long do_restart_poll(struct restart_block *restart_block)
{
struct pollfd __user *ufds = restart_block->poll.ufds;
int nfds = restart_block->poll.nfds;
- ktime_t timeout = 0;
+ ktime_t timeout = restart_block->poll.timeout;
int ret;
- if (restart_block->poll.has_timeout) {
- timeout = ktime_set(restart_block->poll.tv_sec,
- restart_block->poll.tv_nsec);
- }
-
ret = do_sys_poll(ufds, nfds, timeout);
if (ret == -ERESTARTNOHAND) {
@@ -1021,14 +1016,12 @@ static long do_restart_poll(struct restart_block *restart_block)
SYSCALL_DEFINE3(poll, struct pollfd __user *, ufds, unsigned int, nfds,
int, timeout_msecs)
{
- struct timespec64 end_time;
ktime_t timeout = 0;
int ret;
if (timeout_msecs >= 0) {
- poll_select_set_timeout(&end_time, timeout_msecs / MSEC_PER_SEC,
- NSEC_PER_MSEC * (timeout_msecs % MSEC_PER_SEC));
- timeout = timespec64_to_ktime(end_time);
+ timeout = ktime_add_ms(0, timeout_msecs);
+ timeout = ktime_add_safe(ktime_get(), timeout);
}
ret = do_sys_poll(ufds, nfds, timeout);
@@ -1037,16 +1030,10 @@ SYSCALL_DEFINE3(poll, struct pollfd __user *, ufds, unsigned int, nfds,
struct restart_block *restart_block;
restart_block = ¤t->restart_block;
- restart_block->fn = do_restart_poll;
- restart_block->poll.ufds = ufds;
- restart_block->poll.nfds = nfds;
-
- if (timeout_msecs >= 0) {
- restart_block->poll.tv_sec = end_time.tv_sec;
- restart_block->poll.tv_nsec = end_time.tv_nsec;
- restart_block->poll.has_timeout = 1;
- } else
- restart_block->poll.has_timeout = 0;
+ restart_block->fn = do_restart_poll;
+ restart_block->poll.ufds = ufds;
+ restart_block->poll.nfds = nfds;
+ restart_block->poll.timeout = timeout;
ret = -ERESTART_RESTARTBLOCK;
}
diff --git a/include/linux/restart_block.h b/include/linux/restart_block.h
index e66e982105f4..63d647b65395 100644
--- a/include/linux/restart_block.h
+++ b/include/linux/restart_block.h
@@ -49,11 +49,9 @@ struct restart_block {
} nanosleep;
/* For poll */
struct {
+ u64 timeout;
struct pollfd __user *ufds;
int nfds;
- int has_timeout;
- unsigned long tv_sec;
- unsigned long tv_nsec;
} poll;
};
};
--
2.23.0
next prev parent reply other threads:[~2019-09-09 10:24 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-09 10:23 [PATCH 0/9] restart_block: Prepare the ground for dumping timeout Dmitry Safonov
2019-09-09 10:23 ` [PATCH 1/9] futex: Remove unused uaddr2 in restart_block Dmitry Safonov
2019-09-09 10:23 ` [PATCH 2/9] restart_block: Prevent userspace set part of the block Dmitry Safonov
2019-09-09 10:23 ` [PATCH 3/9] select: Convert __esimate_accuracy() to ktime_t Dmitry Safonov
2019-09-09 10:23 ` [PATCH 4/9] select: Micro-optimise __estimate_accuracy() Dmitry Safonov
2019-09-09 11:18 ` Cyrill Gorcunov
2019-09-09 11:50 ` Dmitry Safonov
2019-09-09 12:14 ` Cyrill Gorcunov
2019-09-19 14:05 ` Cyrill Gorcunov
2019-09-19 14:25 ` Dmitry Safonov
2019-09-09 10:23 ` [PATCH 5/9] select: Convert select_estimate_accuracy() to take ktime_t Dmitry Safonov
2019-09-09 10:23 ` [PATCH 6/9] select: Extract common code into do_sys_ppoll() Dmitry Safonov
2019-09-09 11:15 ` kbuild test robot
2019-09-09 19:48 ` kbuild test robot
2019-09-09 10:23 ` [PATCH 7/9] select: Use ktime_t in do_sys_poll() and do_poll() Dmitry Safonov
2019-09-09 10:23 ` Dmitry Safonov [this message]
2019-09-09 13:07 ` [PATCH 8/9] select/restart_block: Convert poll's timeout to u64 David Laight
2019-09-16 15:19 ` Dmitry Safonov
2019-09-09 10:23 ` [PATCH 9/9] restart_block: Make common timeout Dmitry Safonov
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