linux-kernel - Re: [PATCH] zsmalloc: use U suffix for negative literals being shifted

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: <CAHp75VdjBnd=yr9YDPvf0P-e6ofoJwi8d-iOehoP=vuj9rnB8w@mail.gmail.com>
Date:   Mon, 8 Jan 2018 01:02:09 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Minchan Kim <minchan@...nel.org>
Cc:     Nick Desaulniers <nick.desaulniers@...il.com>,
        Nitin Gupta <ngupta@...are.org>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        linux-mm <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] zsmalloc: use U suffix for negative literals being shifted

On Sun, Jan 7, 2018 at 5:04 PM, Minchan Kim <minchan@...nel.org> wrote:

>> -                       link->next = -1 << OBJ_TAG_BITS;
>> +                       link->next = -1U << OBJ_TAG_BITS;
>
> -1UL?

Oh, boy, shouldn't be rather GENMASK() / GENMASK_ULL() in a way how
it's done, for example, here:
https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl.git/commit/?h=for-next&id=d2b3c353595a855794f8b9df5b5bdbe8deb0c413

-- 
With Best Regards,
Andy Shevchenko