linux-kernel - Re: [RFC PATCH 1/2] include/linux/gfp.h: Do not allocate pages on a offlined node

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Message-ID: <Ya2FkkhZdUvWbU/f@casper.infradead.org>
Date:   Mon, 6 Dec 2021 03:37:54 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Nico Pache <npache@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        akpm@...ux-foundation.org, shakeelb@...gle.com,
        ktkhai@...tuozzo.com, shy828301@...il.com, guro@...com,
        vbabka@...e.cz, vdavydov.dev@...il.com, raquini@...hat.com,
        Rafael Aquini <aquini@...hat.com>
Subject: Re: [RFC PATCH 1/2] include/linux/gfp.h: Do not allocate pages on a
 offlined node

On Sun, Dec 05, 2021 at 10:33:37PM -0500, Nico Pache wrote:
> We shouldn't allocate pages on a unavailable node. Add a check for this
> in __alloc_pages_node and return NULL to avoid issues further down the
> callchain.
> 
> Also update the VM_WARN_ON in __alloc_pages_node which could skip this
> warn if the gfp_mask is not GFP_THISNODE.

Why is this not also needed in __folio_alloc_node()?