linux-kernel - RE: [PATCH v2 08/11] ARC: [plat-eznps] spinlock aware for MTM

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Date:   Sun, 4 Jun 2017 06:11:37 +0000
From:   Noam Camus <noamca@...lanox.com>
To:     Vineet Gupta <Vineet.Gupta1@...opsys.com>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2 08/11] ARC: [plat-eznps] spinlock aware for MTM

> From: Vineet Gupta [mailto:Vineet.Gupta1@...opsys.com] 
> Sent: Friday, June 2, 2017 21:36 PM
...

>>   arch/arc/include/asm/spinlock.h |    6 ++++++
>>   1 files changed, 6 insertions(+), 0 deletions(-)
>> 
>> diff --git a/arch/arc/include/asm/spinlock.h 
>> b/arch/arc/include/asm/spinlock.h index 233d5ff..0a54ce7 100644
>> --- a/arch/arc/include/asm/spinlock.h
>> +++ b/arch/arc/include/asm/spinlock.h
>> @@ -252,9 +252,15 @@ static inline void arch_spin_lock(arch_spinlock_t 
>> *lock)
>>   
>>   	__asm__ __volatile__(
>>   	"1:	ex  %0, [%1]		\n"
>> +#ifdef CONFIG_EZNPS_MTM_EXT
>> +	"	.word %3		\n"
>> +#endif
>>   	"	breq  %0, %2, 1b	\n"
>>   	: "+&r" (val)
>>   	: "r"(&(lock->slock)), "ir"(__ARCH_SPIN_LOCK_LOCKED__)
>> +#ifdef CONFIG_EZNPS_MTM_EXT
>> +	, "i"(CTOP_INST_SCHD_RW)
>> +#endif
>>   	: "memory");
>>   
>>   	/*
>> 

>This is ugly - I will fix it up here to create an NPS version of arch_spin_lock !
TNX

-Noam