90 lines
3.4 KiB
Diff
90 lines
3.4 KiB
Diff
From: Ingo Molnar <mingo@elte.hu>
|
|
Date: Fri, 3 Jul 2009 08:44:33 -0500
|
|
Subject: core: Do not disable interrupts on RT in res_counter.c
|
|
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/3.10/patches-3.10.4-rt1.tar.xz
|
|
|
|
Frederic Weisbecker reported this warning:
|
|
|
|
[ 45.228562] BUG: sleeping function called from invalid context at kernel/rtmutex.c:683
|
|
[ 45.228571] in_atomic(): 0, irqs_disabled(): 1, pid: 4290, name: ntpdate
|
|
[ 45.228576] INFO: lockdep is turned off.
|
|
[ 45.228580] irq event stamp: 0
|
|
[ 45.228583] hardirqs last enabled at (0): [<(null)>] (null)
|
|
[ 45.228589] hardirqs last disabled at (0): [<ffffffff8025449d>] copy_process+0x68d/0x1500
|
|
[ 45.228602] softirqs last enabled at (0): [<ffffffff8025449d>] copy_process+0x68d/0x1500
|
|
[ 45.228609] softirqs last disabled at (0): [<(null)>] (null)
|
|
[ 45.228617] Pid: 4290, comm: ntpdate Tainted: G W 2.6.29-rc4-rt1-tip #1
|
|
[ 45.228622] Call Trace:
|
|
[ 45.228632] [<ffffffff8027dfb0>] ? print_irqtrace_events+0xd0/0xe0
|
|
[ 45.228639] [<ffffffff8024cd73>] __might_sleep+0x113/0x130
|
|
[ 45.228646] [<ffffffff8077c811>] rt_spin_lock+0xa1/0xb0
|
|
[ 45.228653] [<ffffffff80296a3d>] res_counter_charge+0x5d/0x130
|
|
[ 45.228660] [<ffffffff802fb67f>] __mem_cgroup_try_charge+0x7f/0x180
|
|
[ 45.228667] [<ffffffff802fc407>] mem_cgroup_charge_common+0x57/0x90
|
|
[ 45.228674] [<ffffffff80212096>] ? ftrace_call+0x5/0x2b
|
|
[ 45.228680] [<ffffffff802fc49d>] mem_cgroup_newpage_charge+0x5d/0x60
|
|
[ 45.228688] [<ffffffff802d94ce>] __do_fault+0x29e/0x4c0
|
|
[ 45.228694] [<ffffffff8077c843>] ? rt_spin_unlock+0x23/0x80
|
|
[ 45.228700] [<ffffffff802db8b5>] handle_mm_fault+0x205/0x890
|
|
[ 45.228707] [<ffffffff80212096>] ? ftrace_call+0x5/0x2b
|
|
[ 45.228714] [<ffffffff8023495e>] do_page_fault+0x11e/0x2a0
|
|
[ 45.228720] [<ffffffff8077e5a5>] page_fault+0x25/0x30
|
|
[ 45.228727] [<ffffffff8043e1ed>] ? __clear_user+0x3d/0x70
|
|
[ 45.228733] [<ffffffff8043e1d1>] ? __clear_user+0x21/0x70
|
|
|
|
The reason is the raw IRQ flag use of kernel/res_counter.c.
|
|
|
|
The irq flags tricks there seem a bit pointless: it cannot protect the
|
|
c->parent linkage because local_irq_save() is only per CPU.
|
|
|
|
So replace it with _nort(). This code needs a second look.
|
|
|
|
Reported-by: Frederic Weisbecker <fweisbec@gmail.com>
|
|
Signed-off-by: Ingo Molnar <mingo@elte.hu>
|
|
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
|
|
|
|
---
|
|
kernel/res_counter.c | 8 ++++----
|
|
1 file changed, 4 insertions(+), 4 deletions(-)
|
|
|
|
Index: linux-stable/kernel/res_counter.c
|
|
===================================================================
|
|
--- linux-stable.orig/kernel/res_counter.c
|
|
+++ linux-stable/kernel/res_counter.c
|
|
@@ -49,7 +49,7 @@ static int __res_counter_charge(struct r
|
|
|
|
r = ret = 0;
|
|
*limit_fail_at = NULL;
|
|
- local_irq_save(flags);
|
|
+ local_irq_save_nort(flags);
|
|
for (c = counter; c != NULL; c = c->parent) {
|
|
spin_lock(&c->lock);
|
|
r = res_counter_charge_locked(c, val, force);
|
|
@@ -69,7 +69,7 @@ static int __res_counter_charge(struct r
|
|
spin_unlock(&u->lock);
|
|
}
|
|
}
|
|
- local_irq_restore(flags);
|
|
+ local_irq_restore_nort(flags);
|
|
|
|
return ret;
|
|
}
|
|
@@ -103,7 +103,7 @@ u64 res_counter_uncharge_until(struct re
|
|
struct res_counter *c;
|
|
u64 ret = 0;
|
|
|
|
- local_irq_save(flags);
|
|
+ local_irq_save_nort(flags);
|
|
for (c = counter; c != top; c = c->parent) {
|
|
u64 r;
|
|
spin_lock(&c->lock);
|
|
@@ -112,7 +112,7 @@ u64 res_counter_uncharge_until(struct re
|
|
ret = r;
|
|
spin_unlock(&c->lock);
|
|
}
|
|
- local_irq_restore(flags);
|
|
+ local_irq_restore_nort(flags);
|
|
return ret;
|
|
}
|
|
|