linux-kernel - Re: [PATCH] coredump: Replace opencoded set_mask

lists.openwall.net		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 linux-cve-announce 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]

Message-ID: <20150807145737.GL16853@twins.programming.kicks-ass.net>
Date:	Fri, 7 Aug 2015 16:57:37 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vineet Gupta <vgupta@...opsys.com>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] coredump: Replace opencoded set_mask_bits()

On Fri, Aug 07, 2015 at 08:14:03PM +0530, Vineet Gupta wrote:

> See, I have such a cmpxchg loop in ARC code - originally from Peter :-)
> arch/arc/kernel/smp.c. @ipi_data_ptr is NOT atomic_t
> 
> 	do {
> 		new = old = ACCESS_ONCE(*ipi_data_ptr);
> 		new |= 1U << msg;
> 	} while (cmpxchg(ipi_data_ptr, old, new) != old);
> 

Well, you'll have atomic_or() real soon now.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/