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

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Message-ID: <CA+KHdyWaRKRu+EAFs=YWft+zmxcd4J_ikJkZ4g_SMx_T5dZvDg@mail.gmail.com>
Date:   Tue, 7 Jun 2022 15:03:39 +0200
From:   Uladzislau Rezki <urezki@...il.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.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 Tue, Jun 7, 2022 at 11:47 AM Christoph Hellwig <hch@...radead.org> wrote:
>
> On Tue, Jun 07, 2022 at 11:34:48AM +0200, 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.
>
> Uhh, why?  This just adds a copletel useless argument.
>
I wrote about it in the cover latter. It is a preparation work for
making vmalloc per-cpu.
In that case free/busy data are located on different rb_roots that is
why those functions
have to be adopted to work with any tree.

-- 
Uladzislau Rezki