Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752518Ab3FJUsE (ORCPT ); Mon, 10 Jun 2013 16:48:04 -0400 Received: from hrndva-omtalb.mail.rr.com ([71.74.56.122]:28074 "EHLO hrndva-omtalb.mail.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751991Ab3FJUsC (ORCPT ); Mon, 10 Jun 2013 16:48:02 -0400 X-Authority-Analysis: v=2.0 cv=Tr1kdUrh c=1 sm=0 a=rXTBtCOcEpjy1lPqhTCpEQ==:17 a=mNMOxpOpBa8A:10 a=wskK765KtKEA:10 a=5SG0PmZfjMsA:10 a=IkcTkHD0fZMA:10 a=meVymXHHAAAA:8 a=GqmPQ3klG2UA:10 a=xeeicz_pqYIpKvZC-tAA:9 a=QEXdDO2ut3YA:10 a=rXTBtCOcEpjy1lPqhTCpEQ==:117 X-Cloudmark-Score: 0 X-Authenticated-User: X-Originating-IP: 74.67.115.198 Message-ID: <1370897278.9844.115.camel@gandalf.local.home> Subject: Re: [PATCH RFC ticketlock] Auto-queued ticketlock From: Steven Rostedt To: paulmck@linux.vnet.ibm.com Cc: linux-kernel@vger.kernel.org, mingo@elte.hu, laijs@cn.fujitsu.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, josh@joshtriplett.org, niv@us.ibm.com, tglx@linutronix.de, peterz@infradead.org, Valdis.Kletnieks@vt.edu, dhowells@redhat.com, edumazet@google.com, darren@dvhart.com, fweisbec@gmail.com, sbw@mit.edu, torvalds@linux-foundation.org Date: Mon, 10 Jun 2013 16:47:58 -0400 In-Reply-To: <20130609193657.GA13392@linux.vnet.ibm.com> References: <20130609193657.GA13392@linux.vnet.ibm.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.4.4-3 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1480 Lines: 50 On Sun, 2013-06-09 at 12:36 -0700, Paul E. McKenney wrote: > --- a/arch/x86/include/asm/spinlock_types.h > +++ b/arch/x86/include/asm/spinlock_types.h > @@ -7,12 +7,18 @@ > > #include > > -#if (CONFIG_NR_CPUS < 256) > +#if (CONFIG_NR_CPUS < 128) > typedef u8 __ticket_t; > typedef u16 __ticketpair_t; > -#else > +#define TICKET_T_CMP_GE(a, b) (UCHAR_MAX / 2 >= (unsigned char)((a) - (b))) > +#elif (CONFIG_NR_CPUS < 32768) > typedef u16 __ticket_t; > typedef u32 __ticketpair_t; > +#define TICKET_T_CMP_GE(a, b) (USHRT_MAX / 2 >= (unsigned short)((a) - (b))) > +#else > +typedef u32 __ticket_t; > +typedef u64 __ticketpair_t; > +#define TICKET_T_CMP_GE(a, b) (UINT_MAX / 2 >= (unsigned int)((a) - (b))) > #endif > > #define TICKET_SHIFT (sizeof(__ticket_t) * 8) > @@ -21,7 +27,11 @@ typedef struct arch_spinlock { > union { > __ticketpair_t head_tail; > struct __raw_tickets { > +#ifdef __BIG_ENDIAN__ Is there such a thing as a BIG_ENDIAN x86 box? This is in arch/x86/include/asm/spinlock_types.h -- Steve > + __ticket_t tail, head; > +#else /* #ifdef __BIG_ENDIAN__ */ > __ticket_t head, tail; > +#endif /* #else #ifdef __BIG_ENDIAN__ */ > } tickets; > }; > } arch_spinlock_t; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/