From: Andrey Konovalov <andreyknvl@gmail.com>
To: Marco Elver <elver@google.com>
Cc: yee.lee@mediatek.com, LKML <linux-kernel@vger.kernel.org>,
nicholas.tang@mediatek.com,
Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>,
chinwen.chang@mediatek.com,
Andrey Ryabinin <ryabinin.a.a@gmail.com>,
Alexander Potapenko <glider@google.com>,
Dmitry Vyukov <dvyukov@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
Matthias Brugger <matthias.bgg@gmail.com>,
"open list:KASAN" <kasan-dev@googlegroups.com>,
"open list:MEMORY MANAGEMENT" <linux-mm@kvack.org>,
"moderated list:ARM/Mediatek SoC support"
<linux-arm-kernel@lists.infradead.org>,
"moderated list:ARM/Mediatek SoC support"
<linux-mediatek@lists.infradead.org>
Subject: Re: [PATCH v6 2/2] kasan: Add memzero int for unaligned size at DEBUG
Date: Mon, 5 Jul 2021 13:23:17 +0200 [thread overview]
Message-ID: <CA+fCnZfKAZuy9oyDpTgNUTcNz5gnfHpJK5WN-yBNDV5VF8cq0g@mail.gmail.com> (raw)
In-Reply-To: <CANpmjNNXbszUL4M+-swi7k28h=zuY-KTfw+6W90hk2mgxr8hRQ@mail.gmail.com>
On Mon, Jul 5, 2021 at 1:18 PM Marco Elver <elver@google.com> wrote:
>
> On Mon, 5 Jul 2021 at 13:12, Andrey Konovalov <andreyknvl@gmail.com> wrote:
> [...]
> > > + /*
> > > + * Explicitly initialize the memory with the precise object size to
> > > + * avoid overwriting the SLAB redzone. This disables initialization in
> > > + * the arch code and may thus lead to performance penalty. The penalty
> > > + * is accepted since SLAB redzones aren't enabled in production builds.
> > > + */
> > > + if (__slub_debug_enabled() &&
> >
> > What happened to slub_debug_enabled_unlikely()? Was it renamed? Why? I
> > didn't receive patch #1 of v6 (nor of v5).
>
> Somebody had the same idea with the helper:
> https://lkml.kernel.org/r/YOKsC75kJfCZwySD@elver.google.com
> and Matthew didn't like the _unlikely() prefix.
>
> Which meant we should just move the existing helper introduced in the
> merge window.
>
> Patch 1/2: https://lkml.kernel.org/r/20210705103229.8505-2-yee.lee@mediatek.com
Got it. Thank you, Marco!
next prev parent reply other threads:[~2021-07-05 11:23 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20210705103229.8505-1-yee.lee@mediatek.com>
2021-07-05 10:32 ` [PATCH v6 1/2] mm: move helper to check slub_debug_enabled yee.lee
2021-07-05 10:32 ` [PATCH v6 2/2] kasan: Add memzero int for unaligned size at DEBUG yee.lee
2021-07-05 10:45 ` Marco Elver
2021-07-05 11:12 ` Andrey Konovalov
2021-07-05 11:18 ` Marco Elver
2021-07-05 11:23 ` Andrey Konovalov [this message]
2021-07-05 13:53 ` Yee Lee
2021-07-05 11:23 ` Andrey Konovalov
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