linux-kernel - Re: [PATCH v3 10/12] mempolicy: alloc_pages

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Message-ID: <CAFYChMu9DO7OeXqQmKbfMY-iGKykHB21V8nqjy=tQa+StfDAUQ@mail.gmail.com>
Date:   Mon, 23 Oct 2023 20:10:32 +0200
From:   domenico cerasuolo <mimmocerasuolo@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Hugh Dickins <hughd@...gle.com>, Andi Kleen <ak@...ux.intel.com>,
        Christoph Lameter <cl@...ux.co>,
        Matthew Wilcox <willy@...radead.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        David Hildenbrand <david@...hat.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Yang Shi <shy828301@...il.com>,
        Sidhartha Kumar <sidhartha.kumar@...cle.com>,
        Vishal Moola <vishal.moola@...il.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Tejun Heo <tj@...nel.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Michal Hocko <mhocko@...e.com>,
        "Huang, Ying" <ying.huang@...el.com>,
        Nhat Pham <nphamcs@...il.com>,
        Yosry Ahmed <yosryahmed@...gle.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v3 10/12] mempolicy: alloc_pages_mpol() for NUMA policy
 without vma

Il giorno lun 23 ott 2023 alle ore 19:53 Andrew Morton
<akpm@...ux-foundation.org> ha scritto:
>
> On Mon, 23 Oct 2023 18:53:26 +0200 domenico cerasuolo <mimmocerasuolo@...il.com> wrote:
>
> > > Rebased to mm.git's current mm-stable, to resolve with removal of
> > > vma_policy() from include/linux/mempolicy.h, and temporary omission
> > > of Nhat's ZSWAP mods from mm/swap_state.c: no other changes.
> >
> > Hi Hugh,
> >
> > not sure if it's the rebase, but I don't see an update to
> > __read_swap_cache_async invocation in zswap.c at line 1078. Shouldn't we pass a
> > mempolicy there too?
>
> No change needed.  zswap_writeback_entry() was passing a NULL for arg
> `vma' and it's now passing a NULL for arg `mpol'.

Problem is that alloc_pages_mpol is dereferencing mpol, when I test the zswap
writeback at 397148729f21edcf700ecb2a01749dbce955d09e it crashes, not sure if
I'm missing something.

>