From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3xNGLP5YrZzDrJv for ; Thu, 3 Aug 2017 13:50:53 +1000 (AEST) Received: from pps.filterd (m0098413.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id v733me5X043032 for ; Wed, 2 Aug 2017 23:50:51 -0400 Received: from e23smtp05.au.ibm.com (e23smtp05.au.ibm.com [202.81.31.147]) by mx0b-001b2d01.pphosted.com with ESMTP id 2c3v7xr541-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Wed, 02 Aug 2017 23:50:50 -0400 Received: from localhost by e23smtp05.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 3 Aug 2017 13:50:48 +1000 Received: from d23av05.au.ibm.com (d23av05.au.ibm.com [9.190.234.119]) by d23relay10.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id v733obqv17956866 for ; Thu, 3 Aug 2017 13:50:45 +1000 Received: from d23av05.au.ibm.com (localhost [127.0.0.1]) by d23av05.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id v733oC8B015714 for ; Thu, 3 Aug 2017 13:50:12 +1000 From: Madhavan Srinivasan To: mpe@ellerman.id.au Cc: benh@kernel.crashing.org, anton@samba.org, paulus@samba.org, npiggin@gmail.com, linuxppc-dev@lists.ozlabs.org, Madhavan Srinivasan Subject: [PATCH v9 02/14] powerpc: move set_soft_enabled() and rename Date: Thu, 3 Aug 2017 09:19:06 +0530 In-Reply-To: <1501732158-19009-1-git-send-email-maddy@linux.vnet.ibm.com> References: <1501732158-19009-1-git-send-email-maddy@linux.vnet.ibm.com> Message-Id: <1501732158-19009-3-git-send-email-maddy@linux.vnet.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Move set_soft_enabled() from powerpc/kernel/irq.c to asm/hw_irq.c, to force updates to paca-soft_enabled done via these access function. Add "memory" clobber to hint compiler since paca->soft_enabled memory is the target here Renaming it as soft_enabled_set() will make namespaces works better as prefix than a postfix when new soft_enabled manipulation functions introduced. Signed-off-by: Madhavan Srinivasan --- arch/powerpc/include/asm/hw_irq.h | 15 +++++++++++++++ arch/powerpc/kernel/irq.c | 12 +++--------- 2 files changed, 18 insertions(+), 9 deletions(-) diff --git a/arch/powerpc/include/asm/hw_irq.h b/arch/powerpc/include/asm/hw_irq.h index d037a57700b9..29f04e287845 100644 --- a/arch/powerpc/include/asm/hw_irq.h +++ b/arch/powerpc/include/asm/hw_irq.h @@ -47,6 +47,21 @@ extern void unknown_exception(struct pt_regs *regs); #ifdef CONFIG_PPC64 #include +/* + *TODO: + * Currently none of the soft_eanbled modification helpers have clobbers + * for modifying the r13->soft_enabled memory itself. Secondly they only + * include "memory" clobber as a hint. Ideally, if all the accesses to + * soft_enabled go via these helpers, we could avoid the "memory" clobber. + * Former could be taken care by having location in the constraints. + */ +static inline notrace void soft_enabled_set(unsigned long enable) +{ + __asm__ __volatile__("stb %0,%1(13)" + : : "r" (enable), "i" (offsetof(struct paca_struct, soft_enabled)) + : "memory"); +} + static inline unsigned long arch_local_save_flags(void) { unsigned long flags; diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c index f9a9a2a27797..d5b90b8e13dc 100644 --- a/arch/powerpc/kernel/irq.c +++ b/arch/powerpc/kernel/irq.c @@ -107,12 +107,6 @@ static inline notrace unsigned long get_irq_happened(void) return happened; } -static inline notrace void set_soft_enabled(unsigned long enable) -{ - __asm__ __volatile__("stb %0,%1(13)" - : : "r" (enable), "i" (offsetof(struct paca_struct, soft_enabled))); -} - static inline notrace int decrementer_check_overflow(void) { u64 now = get_tb_or_rtc(); @@ -212,7 +206,7 @@ notrace void arch_local_irq_restore(unsigned long en) unsigned int replay; /* Write the new soft-enabled value */ - set_soft_enabled(en); + soft_enabled_set(en); if (en == IRQ_DISABLED) return; /* @@ -258,7 +252,7 @@ notrace void arch_local_irq_restore(unsigned long en) } #endif /* CONFIG_TRACE_IRQFLAGS */ - set_soft_enabled(IRQ_DISABLED); + soft_enabled_set(IRQ_DISABLED); /* * Check if anything needs to be re-emitted. We haven't @@ -268,7 +262,7 @@ notrace void arch_local_irq_restore(unsigned long en) replay = __check_irq_replay(); /* We can soft-enable now */ - set_soft_enabled(IRQ_ENABLED); + soft_enabled_set(IRQ_ENABLED); /* * And replay if we have to. This will return with interrupts -- 2.7.4