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

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Message-ID: <Y6XaTM+xSlGNjo0e@pc636>
Date:   Fri, 23 Dec 2022 17:41:48 +0100
From:   Uladzislau Rezki <urezki@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     "Uladzislau Rezki (Sony)" <urezki@...il.com>,
        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>,
        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.
>
Right. In terms of bisection it is not so good. I think folding is the
best.

Andrew, could you please fold this patch into the:

[PATCH v3 1/3] mm: vmalloc: Avoid calling __find_vmap_area() twice in __vunmap() ?

or should i send a v4 instead?

Thank you in advance!

--
Uladzislau Rezki