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Message-ID: <tip-58e1177b4cd10b0d358faf7d7ebb3779f98bc3ea@git.kernel.org>
Date: Thu, 5 Oct 2017 06:03:49 -0700
From: tip-bot for Kees Cook <tipbot@...or.com>
To: linux-tip-commits@...r.kernel.org
Cc: linux@...ck-us.net, pmladek@...e.com, cmetcalf@...lanox.com,
manish.chopra@...ium.com, oleg@...hat.com, hpa@...or.com,
harish.patil@...ium.com, paulus@...ba.org,
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mark.gross@...el.com, jejb@...ux.vnet.ibm.com,
keescook@...omium.org, geert@...ux-m68k.org,
heiko.carstens@...ibm.com, wim@...ana.be, len.brown@...el.com,
mdr@....com, mpe@...erman.id.au
Subject: [tip:timers/core] timer: Convert schedule_timeout() to use
from_timer()
Commit-ID: 58e1177b4cd10b0d358faf7d7ebb3779f98bc3ea
Gitweb: https://git.kernel.org/tip/58e1177b4cd10b0d358faf7d7ebb3779f98bc3ea
Author: Kees Cook <keescook@...omium.org>
AuthorDate: Wed, 4 Oct 2017 16:26:55 -0700
Committer: Thomas Gleixner <tglx@...utronix.de>
CommitDate: Thu, 5 Oct 2017 15:01:16 +0200
timer: Convert schedule_timeout() to use from_timer()
In preparation for unconditionally passing the struct timer_list pointer to
all timer callbacks, switch to using the new from_timer() helper and passing
the timer pointer explicitly. Since this special timer is on the stack, it
needs to have a wrapper structure to carry state once .data is eliminated.
Signed-off-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-mips@...ux-mips.org
Cc: Petr Mladek <pmladek@...e.com>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Lai Jiangshan <jiangshanlai@...il.com>
Cc: Sebastian Reichel <sre@...nel.org>
Cc: Kalle Valo <kvalo@....qualcomm.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Pavel Machek <pavel@....cz>
Cc: linux1394-devel@...ts.sourceforge.net
Cc: Chris Metcalf <cmetcalf@...lanox.com>
Cc: linux-s390@...r.kernel.org
Cc: linux-wireless@...r.kernel.org
Cc: "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>
Cc: Wim Van Sebroeck <wim@...ana.be>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Ursula Braun <ubraun@...ux.vnet.ibm.com>
Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Viresh Kumar <viresh.kumar@...aro.org>
Cc: Harish Patil <harish.patil@...ium.com>
Cc: Guenter Roeck <linux@...ck-us.net>
Cc: Manish Chopra <manish.chopra@...ium.com>
Cc: Len Brown <len.brown@...el.com>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: linux-pm@...r.kernel.org
Cc: Heiko Carstens <heiko.carstens@...ibm.com>
Cc: Tejun Heo <tj@...nel.org>
Cc: Julian Wiedmann <jwi@...ux.vnet.ibm.com>
Cc: John Stultz <john.stultz@...aro.org>
Cc: Mark Gross <mark.gross@...el.com>
Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: linux-watchdog@...r.kernel.org
Cc: linux-scsi@...r.kernel.org
Cc: "Martin K. Petersen" <martin.petersen@...cle.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Stephen Boyd <sboyd@...eaurora.org>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Ralf Baechle <ralf@...ux-mips.org>
Cc: Stefan Richter <stefanr@...6.in-berlin.de>
Cc: Michael Reed <mdr@....com>
Cc: netdev@...r.kernel.org
Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: linuxppc-dev@...ts.ozlabs.org
Cc: Sudip Mukherjee <sudipm.mukherjee@...il.com>
Link: https://lkml.kernel.org/r/1507159627-127660-2-git-send-email-keescook@chromium.org
---
include/linux/timer.h | 8 ++++++++
kernel/time/timer.c | 26 +++++++++++++++++++-------
2 files changed, 27 insertions(+), 7 deletions(-)
diff --git a/include/linux/timer.h b/include/linux/timer.h
index 6383c52..5ef5c9e 100644
--- a/include/linux/timer.h
+++ b/include/linux/timer.h
@@ -179,6 +179,14 @@ static inline void timer_setup(struct timer_list *timer,
(TIMER_DATA_TYPE)timer, flags);
}
+static inline void timer_setup_on_stack(struct timer_list *timer,
+ void (*callback)(struct timer_list *),
+ unsigned int flags)
+{
+ __setup_timer_on_stack(timer, (TIMER_FUNC_TYPE)callback,
+ (TIMER_DATA_TYPE)timer, flags);
+}
+
#define from_timer(var, callback_timer, timer_fieldname) \
container_of(callback_timer, typeof(*var), timer_fieldname)
diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index f2674a0..38613ce 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -1668,9 +1668,20 @@ void run_local_timers(void)
raise_softirq(TIMER_SOFTIRQ);
}
-static void process_timeout(unsigned long __data)
+/*
+ * Since schedule_timeout()'s timer is defined on the stack, it must store
+ * the target task on the stack as well.
+ */
+struct process_timer {
+ struct timer_list timer;
+ struct task_struct *task;
+};
+
+static void process_timeout(struct timer_list *t)
{
- wake_up_process((struct task_struct *)__data);
+ struct process_timer *timeout = from_timer(timeout, t, timer);
+
+ wake_up_process(timeout->task);
}
/**
@@ -1704,7 +1715,7 @@ static void process_timeout(unsigned long __data)
*/
signed long __sched schedule_timeout(signed long timeout)
{
- struct timer_list timer;
+ struct process_timer timer;
unsigned long expire;
switch (timeout)
@@ -1738,13 +1749,14 @@ signed long __sched schedule_timeout(signed long timeout)
expire = timeout + jiffies;
- setup_timer_on_stack(&timer, process_timeout, (unsigned long)current);
- __mod_timer(&timer, expire, false);
+ timer.task = current;
+ timer_setup_on_stack(&timer.timer, process_timeout, 0);
+ __mod_timer(&timer.timer, expire, false);
schedule();
- del_singleshot_timer_sync(&timer);
+ del_singleshot_timer_sync(&timer.timer);
/* Remove the timer from the object tracker */
- destroy_timer_on_stack(&timer);
+ destroy_timer_on_stack(&timer.timer);
timeout = expire - jiffies;
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