linux-kernel - Re: [RFC PATCH 07/11] shmem: remove huge arg from shmem_alloc_and_add

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <ZT7oCHiNa8YZQmzA@casper.infradead.org>
Date:   Sun, 29 Oct 2023 23:17:28 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Daniel Gomez <da.gomez@...sung.com>
Cc:     "minchan@...nel.org" <minchan@...nel.org>,
        "senozhatsky@...omium.org" <senozhatsky@...omium.org>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        "djwong@...nel.org" <djwong@...nel.org>,
        "hughd@...gle.com" <hughd@...gle.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "mcgrof@...nel.org" <mcgrof@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-xfs@...r.kernel.org" <linux-xfs@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "gost.dev@...sung.com" <gost.dev@...sung.com>,
        Pankaj Raghav <p.raghav@...sung.com>
Subject: Re: [RFC PATCH 07/11] shmem: remove huge arg from
 shmem_alloc_and_add_folio()

On Sat, Oct 28, 2023 at 09:15:45PM +0000, Daniel Gomez wrote:
> The huge flag is already part of of the memory allocation flag (gfp_t).
> Make use of the VM_HUGEPAGE bit set by vma_thp_gfp_mask() to know if
> the allocation must be a huge page.

... what?

> +	if (gfp & VM_HUGEPAGE) {

Does sparse not complain about this?  VM_HUGEPAGE is never part of
the GFP flags and there's supposed to be annotations that make the
various checkers warn.