linux-kernel - Re: [PATCH 25/28] mm: remove vmalloc_user_node

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Message-ID: <20200413200306.GC99267@cmpxchg.org>
Date:   Mon, 13 Apr 2020 16:03:06 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     Christoph Hellwig <hch@....de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, x86@...nel.org,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Laura Abbott <labbott@...hat.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Minchan Kim <minchan@...nel.org>,
        Nitin Gupta <ngupta@...are.org>,
        Robin Murphy <robin.murphy@....com>,
        Christophe Leroy <christophe.leroy@....fr>,
        Peter Zijlstra <peterz@...radead.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-hyperv@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org,
        linux-arch@...r.kernel.org, linux-mm@...ck.org,
        iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org, linux-s390@...r.kernel.org,
        bpf <bpf@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 25/28] mm: remove vmalloc_user_node_flags

On Thu, Apr 09, 2020 at 03:25:03PM -0700, Andrii Nakryiko wrote:
> cc Johannes who suggested this API call originally

I forgot why we did it this way - probably just cruft begetting more
cruft. Either way, Christoph's cleanup makes this look a lot better.

> On Wed, Apr 8, 2020 at 5:03 AM Christoph Hellwig <hch@....de> wrote:
> >
> > Open code it in __bpf_map_area_alloc, which is the only caller.  Also
> > clean up __bpf_map_area_alloc to have a single vmalloc call with
> > slightly different flags instead of the current two different calls.
> >
> > For this to compile for the nommu case add a __vmalloc_node_range stub
> > to nommu.c.
> >
> > Signed-off-by: Christoph Hellwig <hch@....de>

Acked-by: Johannes Weiner <hannes@...xchg.org>