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 6/9] select: Extract common code into do_sys_ppoll()
Date: Mon, 9 Sep 2019 11:23:37 +0100 [thread overview]
Message-ID: <20190909102340.8592-7-dima@arista.com> (raw)
In-Reply-To: <20190909102340.8592-1-dima@arista.com>
Reduce the amount of code and shrink a .text section a bit:
[linux]$ ./scripts/bloat-o-meter -t /tmp/vmlinux.o.{old,new}
add/remove: 1/0 grow/shrink: 0/4 up/down: 284/-691 (-407)
Function old new delta
do_sys_ppoll - 284 +284
__x64_sys_ppoll 214 42 -172
__ia32_sys_ppoll 213 40 -173
__ia32_compat_sys_ppoll_time64 213 40 -173
__ia32_compat_sys_ppoll_time32 213 40 -173
Total: Before=13357557, After=13357150, chg -0.00%
The downside is that "tsp" and "sigmask" parameters gets (void *),
but it seems worth losing static type checking if there is only one
line in syscall definition.
Other way could be to add compat parameters in do_sys_ppoll(), but
that trashes 2 more registers..
Signed-off-by: Dmitry Safonov <dima@arista.com>
---
fs/select.c | 94 ++++++++++++++++++-----------------------------------
1 file changed, 32 insertions(+), 62 deletions(-)
diff --git a/fs/select.c b/fs/select.c
index 458f2a944318..262300e58370 100644
--- a/fs/select.c
+++ b/fs/select.c
@@ -1056,54 +1056,58 @@ SYSCALL_DEFINE3(poll, struct pollfd __user *, ufds, unsigned int, nfds,
return ret;
}
-SYSCALL_DEFINE5(ppoll, struct pollfd __user *, ufds, unsigned int, nfds,
- struct __kernel_timespec __user *, tsp, const sigset_t __user *, sigmask,
- size_t, sigsetsize)
+static int do_sys_ppoll(struct pollfd __user *ufds, unsigned int nfds,
+ void __user *tsp, const void __user *sigmask,
+ size_t sigsetsize, enum poll_time_type pt_type)
{
struct timespec64 ts, end_time, *to = NULL;
int ret;
if (tsp) {
- if (get_timespec64(&ts, tsp))
- return -EFAULT;
+ switch (pt_type) {
+ case PT_TIMESPEC:
+ if (get_timespec64(&ts, tsp))
+ return -EFAULT;
+ break;
+ case PT_OLD_TIMESPEC:
+ if (get_old_timespec32(&ts, tsp))
+ return -EFAULT;
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ return -ENOSYS;
+ }
to = &end_time;
if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
return -EINVAL;
}
- ret = set_user_sigmask(sigmask, sigsetsize);
+ if (!in_compat_syscall())
+ ret = set_user_sigmask(sigmask, sigsetsize);
+ else
+ ret = set_compat_user_sigmask(sigmask, sigsetsize);
+
if (ret)
return ret;
ret = do_sys_poll(ufds, nfds, to);
- return poll_select_finish(&end_time, tsp, PT_TIMESPEC, ret);
+ return poll_select_finish(&end_time, tsp, pt_type, ret);
}
-#if defined(CONFIG_COMPAT_32BIT_TIME) && !defined(CONFIG_64BIT)
+SYSCALL_DEFINE5(ppoll, struct pollfd __user *, ufds, unsigned int, nfds,
+ struct __kernel_timespec __user *, tsp, const sigset_t __user *, sigmask,
+ size_t, sigsetsize)
+{
+ return do_sys_ppoll(ufds, nfds, tsp, sigmask, sigsetsize, PT_TIMESPEC);
+}
+#if defined(CONFIG_COMPAT_32BIT_TIME) && !defined(CONFIG_64BIT)
SYSCALL_DEFINE5(ppoll_time32, struct pollfd __user *, ufds, unsigned int, nfds,
struct old_timespec32 __user *, tsp, const sigset_t __user *, sigmask,
size_t, sigsetsize)
{
- struct timespec64 ts, end_time, *to = NULL;
- int ret;
-
- if (tsp) {
- if (get_old_timespec32(&ts, tsp))
- return -EFAULT;
-
- to = &end_time;
- if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
- return -EINVAL;
- }
-
- ret = set_user_sigmask(sigmask, sigsetsize);
- if (ret)
- return ret;
-
- ret = do_sys_poll(ufds, nfds, to);
- return poll_select_finish(&end_time, tsp, PT_OLD_TIMESPEC, ret);
+ return do_sys_ppoll(ufds, nfds, tsp, sigmask, sigsetsize, PT_OLD_TIMESPEC);
}
#endif
@@ -1352,24 +1356,7 @@ COMPAT_SYSCALL_DEFINE5(ppoll_time32, struct pollfd __user *, ufds,
unsigned int, nfds, struct old_timespec32 __user *, tsp,
const compat_sigset_t __user *, sigmask, compat_size_t, sigsetsize)
{
- struct timespec64 ts, end_time, *to = NULL;
- int ret;
-
- if (tsp) {
- if (get_old_timespec32(&ts, tsp))
- return -EFAULT;
-
- to = &end_time;
- if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
- return -EINVAL;
- }
-
- ret = set_compat_user_sigmask(sigmask, sigsetsize);
- if (ret)
- return ret;
-
- ret = do_sys_poll(ufds, nfds, to);
- return poll_select_finish(&end_time, tsp, PT_OLD_TIMESPEC, ret);
+ return do_sys_ppoll(ufds, nfds, tsp, sigmask, sigsetsize, PT_OLD_TIMESPEC);
}
#endif
@@ -1378,24 +1365,7 @@ COMPAT_SYSCALL_DEFINE5(ppoll_time64, struct pollfd __user *, ufds,
unsigned int, nfds, struct __kernel_timespec __user *, tsp,
const compat_sigset_t __user *, sigmask, compat_size_t, sigsetsize)
{
- struct timespec64 ts, end_time, *to = NULL;
- int ret;
-
- if (tsp) {
- if (get_timespec64(&ts, tsp))
- return -EFAULT;
-
- to = &end_time;
- if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
- return -EINVAL;
- }
-
- ret = set_compat_user_sigmask(sigmask, sigsetsize);
- if (ret)
- return ret;
-
- ret = do_sys_poll(ufds, nfds, to);
- return poll_select_finish(&end_time, tsp, PT_TIMESPEC, ret);
+ return do_sys_ppoll(ufds, nfds, tsp, sigmask, sigsetsize, PT_TIMESPEC);
}
#endif
--
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 ` Dmitry Safonov [this message]
2019-09-09 11:15 ` [PATCH 6/9] select: Extract common code into do_sys_ppoll() 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 ` [PATCH 8/9] select/restart_block: Convert poll's timeout to u64 Dmitry Safonov
2019-09-09 13:07 ` 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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