linux-kernel - Re: [PATCH v3 2/3] mm: vmalloc: Switch to find_unlink_vmap_area() in vm_unmap

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Date:   Fri, 23 Dec 2022 00:21:23 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     "Uladzislau Rezki (Sony)" <urezki@...il.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        LKML <linux-kernel@...r.kernel.org>, Baoquan He <bhe@...hat.com>,
        Lorenzo Stoakes <lstoakes@...il.com>,
        Christoph Hellwig <hch@...radead.org>,
        Matthew Wilcox <willy@...radead.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...y.com>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v3 2/3] mm: vmalloc: Switch to find_unlink_vmap_area() in
 vm_unmap_ram()

On Thu, Dec 22, 2022 at 08:00:21PM +0100, Uladzislau Rezki (Sony) wrote:
> --- a/mm/vmalloc.c
> +++ b/mm/vmalloc.c
> @@ -2252,7 +2252,7 @@ void vm_unmap_ram(const void *mem, unsigned int count)
>  		return;
>  	}
>  
> -	va = find_vmap_area(addr);
> +	va = find_unlink_vmap_area(addr);
>  	BUG_ON(!va);
>  	debug_check_no_locks_freed((void *)va->va_start,
>  				    (va->va_end - va->va_start));

Don't we also need to remove the manual unlink that was done
here previously?   Actually it seems like that manual unlink is missing
after patch 1, creating a bisection hazard.  So either add it there,
or just fold this patch into the previous one.