linux-kernel - Re: [PATCH 4/5] mm/vmalloc: Extend __find_vmap

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Date:   Wed, 8 Jun 2022 11:47:12 +0800
From:   Baoquan He <bhe@...hat.com>
To:     "Uladzislau Rezki (Sony)" <urezki@...il.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        LKML <linux-kernel@...r.kernel.org>,
        Christoph Hellwig <hch@...radead.org>,
        Matthew Wilcox <willy@...radead.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...y.com>
Subject: Re: [PATCH 4/5] mm/vmalloc: Extend __find_vmap_area() with one more
 argument

On 06/07/22 at 11:34am, Uladzislau Rezki (Sony) wrote:
> __find_vmap_area() finds a "vmap_area" based on passed address.
> It scan the specific "vmap_area_root" rb-tree. Extend the function
> with one extra argument, so any tree can be specified where the
> search has to be done.
> 
> There is no functional change as a result of this patch.

LGTM,
Reviewed-by: Baoquan He <bhe@...hat.com>

> 
> Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
> ---
>  mm/vmalloc.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/mm/vmalloc.c b/mm/vmalloc.c
> index 82771e555273..b60385101897 100644
> --- a/mm/vmalloc.c
> +++ b/mm/vmalloc.c
> @@ -814,9 +814,9 @@ static struct vmap_area *find_vmap_area_exceed_addr(unsigned long addr)
>  	return va;
>  }
>  
> -static struct vmap_area *__find_vmap_area(unsigned long addr)
> +static struct vmap_area *__find_vmap_area(unsigned long addr, struct rb_root *root)
>  {
> -	struct rb_node *n = vmap_area_root.rb_node;
> +	struct rb_node *n = root->rb_node;
>  
>  	addr = (unsigned long)kasan_reset_tag((void *)addr);
>  
> @@ -1840,7 +1840,7 @@ static struct vmap_area *find_vmap_area(unsigned long addr)
>  	struct vmap_area *va;
>  
>  	spin_lock(&vmap_area_lock);
> -	va = __find_vmap_area(addr);
> +	va = __find_vmap_area(addr, &vmap_area_root);
>  	spin_unlock(&vmap_area_lock);
>  
>  	return va;
> @@ -2582,7 +2582,7 @@ struct vm_struct *remove_vm_area(const void *addr)
>  	might_sleep();
>  
>  	spin_lock(&vmap_area_lock);
> -	va = __find_vmap_area((unsigned long)addr);
> +	va = __find_vmap_area((unsigned long)addr, &vmap_area_root);
>  	if (va && va->vm) {
>  		struct vm_struct *vm = va->vm;
>  
> -- 
> 2.30.2
> 
>