lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Sun, 14 Dec 2014 03:14:29 +0000
From:	Al Viro <>
To:	Linus Torvalds <>
Cc:	Dave Jones <>, Chris Mason <>,
	Mike Galbraith <>,
	Ingo Molnar <>,
	Peter Zijlstra <>,
	Dâniel Fraga <>,
	Sasha Levin <>,
	"Paul E. McKenney" <>,
	Linux Kernel Mailing List <>,
	Thomas Gleixner <>
Subject: Re: frequent lockups in 3.18rc4

On Sat, Dec 13, 2014 at 05:35:17PM -0800, Linus Torvalds wrote:
> On Sat, Dec 13, 2014 at 4:33 PM, Al Viro <> wrote:
> >
> > So does SMP - this_cpu_dec() relies on preemption being disabled.
> No. really. It very much does not. Not on x86, not elsewhere. It's
> part of the whole point of "this_cpu_p()". They are preemption and
> interrupt safe.
> It's the "__this_cpu_op()" ones that need external protection.

Right you are - I really need to get some coffee...  Sorry...

FWIW, do we need to disable interrupts there?  After all, mnt_want_write()
and mnt_drop_write() shouldn't be done from interrupt context - they can
happen via schedule_delayed_work(), but that's it...
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

Powered by blists - more mailing lists