linux-kernel - Re: [PATCH 3/4] sparc64: convert spinlock_t to raw_spinlock_t in mmu_context

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Date:	Wed, 12 Feb 2014 13:01:52 +0530
From:	Allen Pais <allen.pais@...cle.com>
To:	Kirill Tkhai <tkhai@...dex.ru>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"sparclinux@...r.kernel.org" <sparclinux@...r.kernel.org>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"bigeasy@...utronix.de" <bigeasy@...utronix.de>
Subject: Re: [PATCH 3/4] sparc64: convert spinlock_t to raw_spinlock_t in
 mmu_context_t

On Wednesday 12 February 2014 02:43 AM, Kirill Tkhai wrote:
> 
> 
> 06.01.2014, 07:56, "Allen Pais" <allen.pais@...cle.com>:
>> In the attempt of get PREEMPT_RT working on sparc64 using
>> linux-stable-rt version 3.10.22-rt19+, the kernel crash
>> with the following trace:
>>
>> [ 1487.027884] I7: <rt_mutex_setprio+0x3c/0x2c0>
>> [ 1487.027885] Call Trace:
>> [ 1487.027887]  [00000000004967dc] rt_mutex_setprio+0x3c/0x2c0
>> [ 1487.027892]  [00000000004afe20] task_blocks_on_rt_mutex+0x180/0x200
>> [ 1487.027895]  [0000000000819114] rt_spin_lock_slowlock+0x94/0x300
>> [ 1487.027897]  [0000000000817ebc] __schedule+0x39c/0x53c
>> [ 1487.027899]  [00000000008185fc] schedule+0x1c/0xc0
>> [ 1487.027908]  [000000000048fff4] smpboot_thread_fn+0x154/0x2e0
>> [ 1487.027913]  [000000000048753c] kthread+0x7c/0xa0
>> [ 1487.027920]  [00000000004060c4] ret_from_syscall+0x1c/0x2c
>> [ 1487.027922]  [0000000000000000]           (null)
>> - spin_unlock_irqrestore(&mm->context.lock, flags);
>> + raw_spin_unlock_irqrestore(&mm->context.lock, flags);
>>  }
> 
> We also should do the same in update_mmu_cache_pmd().
> 

I have already done this. I should have updated the patch. the issue still
persists though.

- Allen
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