linux-kernel - Re: [RFC V3] mm: Generalize and rename notify_page_fault() as kprobe_page

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: <62aa0369-9542-17bc-034b-8445664c7c10@arm.com>
Date:   Mon, 10 Jun 2019 10:36:32 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Dave Hansen <dave.hansen@...el.com>,
        Matthew Wilcox <willy@...radead.org>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-arm-kernel@...ts.infradead.org, linux-ia64@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
        x86@...nel.org, Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Mark Rutland <mark.rutland@....com>,
        Christophe Leroy <christophe.leroy@....fr>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Paul Mackerras <paulus@...ba.org>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Tony Luck <tony.luck@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        "David S. Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Vineet Gupta <vgupta@...opsys.com>,
        linux-snps-arc@...ts.infradead.org,
        James Hogan <jhogan@...nel.org>, linux-mips@...r.kernel.org,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>
Subject: Re: [RFC V3] mm: Generalize and rename notify_page_fault() as
 kprobe_page_fault()



On 06/10/2019 10:27 AM, Dave Hansen wrote:
> On 6/9/19 9:34 PM, Anshuman Khandual wrote:
>>> Do you really think this is easier to read?
>>>
>>> Why not just move the x86 version to include/linux/kprobes.h, and replace
>>> the int with bool?
>> Will just return bool directly without an additional variable here as suggested
>> before. But for the conditional statement, I guess the proposed one here is more
>> compact than the x86 one.
> 
> FWIW, I don't think "compact" is generally a good goal for code.  Being
> readable is 100x more important than being compact and being un-compact
> is only a problem when it hurts readability.
> 
> For a function like the one in question, having the individual return
> conditions clearly commented is way more important than saving 10 lines
> of code.

Fair enough. Will keep the existing code flow from x86.