linux-kernel - Re: [PATCH 04/20] x86/ticketlock: make large and small ticket versions of spin

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: <4CDD6AD8.5030003@goop.org>
Date:	Fri, 12 Nov 2010 08:27:04 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	vatsa@...ux.vnet.ibm.com
CC:	Peter Zijlstra <peterz@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Nick Piggin <npiggin@...e.de>,
	Jan Beulich <JBeulich@...ell.com>, Avi Kivity <avi@...hat.com>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linux Virtualization <virtualization@...ts.linux-foundation.org>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: Re: [PATCH 04/20] x86/ticketlock: make large and small ticket versions
 of spin_lock the same

On 11/12/2010 04:19 AM, Srivatsa Vaddagiri wrote:
> On Wed, Nov 03, 2010 at 10:59:45AM -0400, Jeremy Fitzhardinge wrote:
>> Make the bulk of __ticket_spin_lock look identical for large and small
>> number of cpus.
> [snip]
>
>>  #if (NR_CPUS < 256)
>>  static __always_inline void __ticket_spin_lock(arch_spinlock_t *lock)
>>  {
>> -	register union {
>> -		struct __raw_tickets tickets;
>> -		unsigned short slock;
>> -	} inc = { .slock = 1 << TICKET_SHIFT };
>> +	register struct __raw_tickets inc = { .tail = 1 };
> [snip]
>
>>  #else
>>  static __always_inline void __ticket_spin_lock(arch_spinlock_t *lock)
>>  {
>> -	unsigned inc = 1 << TICKET_SHIFT;
>> -	__ticket_t tmp;
>> +	register struct __raw_tickets inc = { .tickets.tail = 1 };
> s/.tickets//?
>
> Otherwise I get a compile error for NR_CPUS > 256, with just 4 patches applied.

Yeah, likely.  That's precisely why I wanted to make them the same ;).

    J
--
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/