linux-kernel - Re: [PATCH v4 29/66] parisc: Remove mmap linked list from cache handling

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Date:   Tue, 18 Jan 2022 13:06:43 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Liam Howlett <liam.howlett@...cle.com>,
        "maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Song Liu <songliubraving@...com>,
        Davidlohr Bueso <dave@...olabs.net>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Laurent Dufour <ldufour@...ux.ibm.com>,
        David Rientjes <rientjes@...gle.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Rik van Riel <riel@...riel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Michel Lespinasse <walken.cr@...il.com>,
        Jerome Glisse <jglisse@...hat.com>,
        Minchan Kim <minchan@...gle.com>,
        Joel Fernandes <joelaf@...gle.com>,
        Rom Lemarchand <romlem@...gle.com>
Subject: Re: [PATCH v4 29/66] parisc: Remove mmap linked list from cache
 handling

On 12/1/21 15:30, Liam Howlett wrote:
> From: "Liam R. Howlett" <Liam.Howlett@...cle.com>
> 
> Use the VMA iterator instead.
> 
> Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>

Acked-by: Vlastimil Babka <vbabka@...e.cz>

> ---
>  arch/parisc/kernel/cache.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/parisc/kernel/cache.c b/arch/parisc/kernel/cache.c
> index 94150b91c96f..c3a8d29b6f9f 100644
> --- a/arch/parisc/kernel/cache.c
> +++ b/arch/parisc/kernel/cache.c
> @@ -519,9 +519,11 @@ static inline unsigned long mm_total_size(struct mm_struct *mm)
>  {
>  	struct vm_area_struct *vma;
>  	unsigned long usize = 0;
> +	VMA_ITERATOR(vmi, mm, 0);
>  
> -	for (vma = mm->mmap; vma; vma = vma->vm_next)
> +	for_each_vma(vmi, vma)
>  		usize += vma->vm_end - vma->vm_start;
> +
>  	return usize;
>  }
>  
> @@ -570,6 +572,7 @@ static void flush_user_cache_tlb(struct vm_area_struct *vma,
>  void flush_cache_mm(struct mm_struct *mm)
>  {
>  	struct vm_area_struct *vma;
> +	VMA_ITERATOR(vmi, mm, 0);
>  
>  	/* Flushing the whole cache on each cpu takes forever on
>  	   rp3440, etc.  So, avoid it if the mm isn't too big.  */
> @@ -583,13 +586,13 @@ void flush_cache_mm(struct mm_struct *mm)
>  
>  	preempt_disable();
>  	if (mm->context == mfsp(3)) {
> -		for (vma = mm->mmap; vma; vma = vma->vm_next)
> +		for_each_vma(vmi, vma)
>  			flush_user_cache_tlb(vma, vma->vm_start, vma->vm_end);
>  		preempt_enable();
>  		return;
>  	}
>  
> -	for (vma = mm->mmap; vma; vma = vma->vm_next)
> +	for_each_vma(vmi, vma)
>  		flush_cache_pages(vma, mm, vma->vm_start, vma->vm_end);
>  	preempt_enable();
>  }