linux-kernel - Re: [v2 PATCH] RISC-V: Optimize tlb flush path.

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 for Android: free password hash cracker in your pocket

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

Message-ID: <20190820071639.GA2335@infradead.org>
Date:   Tue, 20 Aug 2019 00:16:40 -0700
From:   "hch@...radead.org" <hch@...radead.org>
To:     Andreas Schwab <schwab@...ux-m68k.org>
Cc:     "hch@...radead.org" <hch@...radead.org>,
        Atish Patra <atish.patra@....com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Anup Patel <anup@...infault.org>,
        Palmer Dabbelt <palmer@...ive.com>,
        linux-kernel@...r.kernel.org,
        Paul Walmsley <paul.walmsley@...ive.com>,
        linux-riscv@...ts.infradead.org,
        Allison Randal <allison@...utok.net>
Subject: Re: [v2 PATCH] RISC-V: Optimize tlb flush path.

On Tue, Aug 20, 2019 at 09:14:58AM +0200, Andreas Schwab wrote:
> On Aug 19 2019, "hch@...radead.org" <hch@...radead.org> wrote:
> 
> > This looks a little odd to m and assumes we never pass a size smaller
> > than PAGE_SIZE.  Whule that is probably true, why not something like:
> >
> > 	if (size < PAGE_SIZE && size != -1)
> 
> ITYM size <= PAGE_SIZE.  And since size is unsigned it cannot be == -1
> at the same time.

Yes, the <= was obvious, that's what you get for hacking up a demo
patch on the plan.  And true for the -1.  That being said I find the
-1 convention rather annoying, a ULONG_MAX in the callers would be
a lot more obvious.