linux-kernel - Re: [PATCH 13/14] x86/ticketlock: add slowpath logic

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]

Date:	Wed, 17 Nov 2010 08:31:50 +0000
From:	"Jan Beulich" <JBeulich@...ell.com>
To:	"Jeremy Fitzhardinge" <jeremy@...p.org>
Cc:	"Jeremy Fitzhardinge" <jeremy.fitzhardinge@...rix.com>,
	"Eric Dumazet" <dada1@...mosbay.com>, <xiyou.wangcong@...il.com>,
	"Peter Zijlstra" <peterz@...radead.org>,
	"Nick Piggin" <npiggin@...nel.dk>,
	"Srivatsa Vaddagiri" <vatsa@...ux.vnet.ibm.com>,
	"Linux Virtualization" <virtualization@...ts.linux-foundation.org>,
	"Xen-devel" <xen-devel@...ts.xensource.com>,
	"Mathieu Desnoyers" <mathieu.desnoyers@...ymtl.ca>,
	"Avi Kivity" <avi@...hat.com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH 13/14] x86/ticketlock: add slowpath logic

>>> On 16.11.10 at 22:08, Jeremy Fitzhardinge <jeremy@...p.org> wrote:
> +static inline void __ticket_enter_slowpath(struct arch_spinlock *lock)
> +{
> +	if (sizeof(lock->tickets.tail) == sizeof(u8))
> +		asm (LOCK_PREFIX "orb %1, %0"
> +		     : "+m" (lock->tickets.tail)
> +		     : "i" (TICKET_SLOWPATH_FLAG) : "memory");
> +	else
> +		asm (LOCK_PREFIX "orw %1, %0"
> +		     : "+m" (lock->tickets.tail)
> +		     : "i" (TICKET_SLOWPATH_FLAG) : "memory");
> +}

Came only now to mind: Here and elsewhere, did you try using
%z0 to have gcc produce the opcode suffix character, rather
than having these somewhat ugly if()-s?

Jan

--
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/