linux-kernel - Re: [BUG]: mm/vmalloc: uninitialized variable access in pcpu_get_vm

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Message-ID: <CAK8P3a0965MhQfpygCqxqnocLt9f4L80-mF-UgoP5OdAoLCCqw@mail.gmail.com>
Date:   Tue, 18 Jun 2019 10:01:26 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Uladzislau Rezki <urezki@...il.com>
Cc:     Roman Gushchin <guro@...com>, Michal Hocko <mhocko@...e.com>,
        Matthew Wilcox <willy@...radead.org>,
        Thomas Garnier <thgarnie@...gle.com>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...ymobile.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Joel Fernandes <joelaf@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...e.hu>, Tejun Heo <tj@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Roman Penyaev <rpenyaev@...e.de>,
        Rick Edgecombe <rick.p.edgecombe@...el.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Linux-MM <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [BUG]: mm/vmalloc: uninitialized variable access in pcpu_get_vm_areas

On Mon, Jun 17, 2019 at 9:29 PM Arnd Bergmann <arnd@...db.de> wrote:
> On Mon, Jun 17, 2019 at 6:57 PM Uladzislau Rezki <urezki@...il.com> wrote:

> Using switch/case makes it easier for the compiler because it
> seems to turn this into a single conditional instead of a set of
> conditions. It also seems to be the much more common style
> in the kernel.

Nevermind, the warning came back after all. It's now down to
one out of 2000 randconfig builds I tested, but that's not good
enough. I'll send a patch the way you suggested.

      Arnd