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

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Date:   Sun, 9 Jun 2019 21:57:29 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Anshuman Khandual <anshuman.khandual@....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 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.