From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754265AbaBKVYU (ORCPT ); Tue, 11 Feb 2014 16:24:20 -0500 Received: from forward20.mail.yandex.net ([95.108.253.145]:35407 "EHLO forward20.mail.yandex.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752993AbaBKVYS (ORCPT ); Tue, 11 Feb 2014 16:24:18 -0500 X-Greylist: delayed 631 seconds by postgrey-1.27 at vger.kernel.org; Tue, 11 Feb 2014 16:24:18 EST From: Kirill Tkhai To: Allen Pais , "linux-kernel@vger.kernel.org" Cc: "sparclinux@vger.kernel.org" , "davem@davemloft.net" , "bigeasy@linutronix.de" In-Reply-To: <1388980510-10190-4-git-send-email-allen.pais@oracle.com> References: <1388980510-10190-1-git-send-email-allen.pais@oracle.com> <1388980510-10190-4-git-send-email-allen.pais@oracle.com> Subject: Re: [PATCH 3/4] sparc64: convert spinlock_t to raw_spinlock_t in mmu_context_t MIME-Version: 1.0 Message-Id: <341392153219@web17g.yandex.ru> X-Mailer: Yamail [ http://yandex.ru ] 5.0 Date: Wed, 12 Feb 2014 01:13:39 +0400 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=koi8-r Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 06.01.2014, 07:56, "Allen Pais" : > 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: > [ 1487.027885] Call Trace: > [ 1487.027887] š[00000000004967dc] rt_mutex_setprio+0x3c/0x2c0 > [ 1487.027892] š[00000000004afe20] task_blocks_on_rt_mutex+0x180/0x200 > [ 1487.027895] š[0000000000819114] rt_spin_lock_slowlock+0x94/0x300 > [ 1487.027897] š[0000000000817ebc] __schedule+0x39c/0x53c > [ 1487.027899] š[00000000008185fc] schedule+0x1c/0xc0 > [ 1487.027908] š[000000000048fff4] smpboot_thread_fn+0x154/0x2e0 > [ 1487.027913] š[000000000048753c] kthread+0x7c/0xa0 > [ 1487.027920] š[00000000004060c4] ret_from_syscall+0x1c/0x2c > [ 1487.027922] š[0000000000000000] šššššššššš(null) > > Thomas debugged this issue and pointed to switch_mm > > ššššššššspin_lock_irqsave(&mm->context.lock, flags); > > context.lock needs to be a raw_spinlock. > > Acked-by: David S. Miller > Signed-off-by: Allen Pais > --- > šarch/sparc/include/asm/mmu_64.h šššššššš| ššš2 +- > šarch/sparc/include/asm/mmu_context_64.h | ššš8 ++++---- > šarch/sparc/kernel/smp_64.c ššššššššššššš| ššš4 ++-- > šarch/sparc/mm/init_64.c šššššššššššššššš| ššš4 ++-- > šarch/sparc/mm/tsb.c šššššššššššššššššššš| šš16 ++++++++-------- > š5 files changed, 17 insertions(+), 17 deletions(-) > > diff --git a/arch/sparc/include/asm/mmu_64.h b/arch/sparc/include/asm/mmu_64.h > index 76092c4..e945ddb 100644 > --- a/arch/sparc/include/asm/mmu_64.h > +++ b/arch/sparc/include/asm/mmu_64.h > @@ -90,7 +90,7 @@ struct tsb_config { > š#endif > > štypedef struct { > - spinlock_t lock; > + raw_spinlock_t lock; > šššššššššunsigned long sparc64_ctx_val; > šššššššššunsigned long huge_pte_count; > šššššššššstruct page *pgtable_page; > diff --git a/arch/sparc/include/asm/mmu_context_64.h b/arch/sparc/include/asm/mmu_context_64.h > index 3d528f0..3a85624 100644 > --- a/arch/sparc/include/asm/mmu_context_64.h > +++ b/arch/sparc/include/asm/mmu_context_64.h > @@ -77,7 +77,7 @@ static inline void switch_mm(struct mm_struct *old_mm, struct mm_struct *mm, str > šššššššššif (unlikely(mm == &init_mm)) > šššššššššššššššššreturn; > > - spin_lock_irqsave(&mm->context.lock, flags); > + raw_spin_lock_irqsave(&mm->context.lock, flags); > šššššššššctx_valid = CTX_VALID(mm->context); > šššššššššif (!ctx_valid) > šššššššššššššššššget_new_mmu_context(mm); > @@ -125,7 +125,7 @@ static inline void switch_mm(struct mm_struct *old_mm, struct mm_struct *mm, str > ššššššššššššššššš__flush_tlb_mm(CTX_HWBITS(mm->context), > ššššššššššššššššššššššššššššššššSECONDARY_CONTEXT); > ššššššššš} > - spin_unlock_irqrestore(&mm->context.lock, flags); > + raw_spin_unlock_irqrestore(&mm->context.lock, flags); > š} > > š#define deactivate_mm(tsk,mm) do { } while (0) > @@ -136,7 +136,7 @@ static inline void activate_mm(struct mm_struct *active_mm, struct mm_struct *mm > šššššššššunsigned long flags; > šššššššššint cpu; > > - spin_lock_irqsave(&mm->context.lock, flags); > + raw_spin_lock_irqsave(&mm->context.lock, flags); > šššššššššif (!CTX_VALID(mm->context)) > šššššššššššššššššget_new_mmu_context(mm); > šššššššššcpu = smp_processor_id(); > @@ -146,7 +146,7 @@ static inline void activate_mm(struct mm_struct *active_mm, struct mm_struct *mm > šššššššššload_secondary_context(mm); > ššššššššš__flush_tlb_mm(CTX_HWBITS(mm->context), SECONDARY_CONTEXT); > ššššššššštsb_context_switch(mm); > - spin_unlock_irqrestore(&mm->context.lock, flags); > + raw_spin_unlock_irqrestore(&mm->context.lock, flags); > š} > > š#endif /* !(__ASSEMBLY__) */ > diff --git a/arch/sparc/kernel/smp_64.c b/arch/sparc/kernel/smp_64.c > index 77539ed..f42e1a7 100644 > --- a/arch/sparc/kernel/smp_64.c > +++ b/arch/sparc/kernel/smp_64.c > @@ -975,12 +975,12 @@ void __irq_entry smp_new_mmu_context_version_client(int irq, struct pt_regs *reg > šššššššššif (unlikely(!mm || (mm == &init_mm))) > šššššššššššššššššreturn; > > - spin_lock_irqsave(&mm->context.lock, flags); > + raw_spin_lock_irqsave(&mm->context.lock, flags); > > šššššššššif (unlikely(!CTX_VALID(mm->context))) > šššššššššššššššššget_new_mmu_context(mm); > > - spin_unlock_irqrestore(&mm->context.lock, flags); > + raw_spin_unlock_irqrestore(&mm->context.lock, flags); > > šššššššššload_secondary_context(mm); > ššššššššš__flush_tlb_mm(CTX_HWBITS(mm->context), > diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c > index 04fd55a..bd5253d 100644 > --- a/arch/sparc/mm/init_64.c > +++ b/arch/sparc/mm/init_64.c > @@ -350,7 +350,7 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t * > > šššššššššmm = vma->vm_mm; > > - spin_lock_irqsave(&mm->context.lock, flags); > + raw_spin_lock_irqsave(&mm->context.lock, flags); > > š#if defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE) > šššššššššif (mm->context.huge_pte_count && is_hugetlb_pte(pte)) > @@ -361,7 +361,7 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t * > ššššššššššššššššš__update_mmu_tsb_insert(mm, MM_TSB_BASE, PAGE_SHIFT, > šššššššššššššššššššššššššššššššššššššššššaddress, pte_val(pte)); > > - spin_unlock_irqrestore(&mm->context.lock, flags); > + raw_spin_unlock_irqrestore(&mm->context.lock, flags); > š} We also should do the same in update_mmu_cache_pmd(). > > švoid flush_dcache_page(struct page *page) > diff --git a/arch/sparc/mm/tsb.c b/arch/sparc/mm/tsb.c > index 2cc3bce..d84d4ea 100644 > --- a/arch/sparc/mm/tsb.c > +++ b/arch/sparc/mm/tsb.c > @@ -73,7 +73,7 @@ void flush_tsb_user(struct tlb_batch *tb) > šššššššššstruct mm_struct *mm = tb->mm; > šššššššššunsigned long nentries, base, flags; > > - spin_lock_irqsave(&mm->context.lock, flags); > + raw_spin_lock_irqsave(&mm->context.lock, flags); > > šššššššššbase = (unsigned long) mm->context.tsb_block[MM_TSB_BASE].tsb; > šššššššššnentries = mm->context.tsb_block[MM_TSB_BASE].tsb_nentries; > @@ -90,14 +90,14 @@ void flush_tsb_user(struct tlb_batch *tb) > ššššššššššššššššš__flush_tsb_one(tb, HPAGE_SHIFT, base, nentries); > ššššššššš} > š#endif > - spin_unlock_irqrestore(&mm->context.lock, flags); > + raw_spin_unlock_irqrestore(&mm->context.lock, flags); > š} > > švoid flush_tsb_user_page(struct mm_struct *mm, unsigned long vaddr) > š{ > šššššššššunsigned long nentries, base, flags; > > - spin_lock_irqsave(&mm->context.lock, flags); > + raw_spin_lock_irqsave(&mm->context.lock, flags); > > šššššššššbase = (unsigned long) mm->context.tsb_block[MM_TSB_BASE].tsb; > šššššššššnentries = mm->context.tsb_block[MM_TSB_BASE].tsb_nentries; > @@ -114,7 +114,7 @@ void flush_tsb_user_page(struct mm_struct *mm, unsigned long vaddr) > ššššššššššššššššš__flush_tsb_one_entry(base, vaddr, HPAGE_SHIFT, nentries); > ššššššššš} > š#endif > - spin_unlock_irqrestore(&mm->context.lock, flags); > + raw_spin_unlock_irqrestore(&mm->context.lock, flags); > š} > > š#define HV_PGSZ_IDX_BASE HV_PGSZ_IDX_8K > @@ -392,7 +392,7 @@ retry_tsb_alloc: > šššššššššš* the lock and ask all other cpus running this address space > šššššššššš* to run tsb_context_switch() to see the new TSB table. > šššššššššš*/ > - spin_lock_irqsave(&mm->context.lock, flags); > + raw_spin_lock_irqsave(&mm->context.lock, flags); > > šššššššššold_tsb = mm->context.tsb_block[tsb_index].tsb; > šššššššššold_cache_index = > @@ -407,7 +407,7 @@ retry_tsb_alloc: > šššššššššš*/ > šššššššššif (unlikely(old_tsb && > šššššššššššššššššššššš(rss < mm->context.tsb_block[tsb_index].tsb_rss_limit))) { > - spin_unlock_irqrestore(&mm->context.lock, flags); > + raw_spin_unlock_irqrestore(&mm->context.lock, flags); > > ššššššššššššššššškmem_cache_free(tsb_caches[new_cache_index], new_tsb); > šššššššššššššššššreturn; > @@ -433,7 +433,7 @@ retry_tsb_alloc: > šššššššššmm->context.tsb_block[tsb_index].tsb = new_tsb; > šššššššššsetup_tsb_params(mm, tsb_index, new_size); > > - spin_unlock_irqrestore(&mm->context.lock, flags); > + raw_spin_unlock_irqrestore(&mm->context.lock, flags); > > ššššššššš/* If old_tsb is NULL, we're being invoked for the first time > šššššššššš* from init_new_context(). > @@ -459,7 +459,7 @@ int init_new_context(struct task_struct *tsk, struct mm_struct *mm) > š#endif > šššššššššunsigned int i; > > - spin_lock_init(&mm->context.lock); > + raw_spin_lock_init(&mm->context.lock); > > šššššššššmm->context.sparc64_ctx_val = 0UL; > > -- > 1.7.10.4 > > -- > 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 šhttp://vger.kernel.org/majordomo-info.html > Please read the FAQ at šhttp://www.tux.org/lkml/