linux-kernel - Re: [PATCH v3 03/24] arm: Remove COMMAND_LINE

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Message-ID: <CAHVXubidtBHNi8iFrFAWqRtkxiUBbmzzXFn+=R1DjEd5X0SpQw@mail.gmail.com>
Date:   Thu, 23 Feb 2023 14:11:55 +0100
From:   Alexandre Ghiti <alexghiti@...osinc.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Russell King <linux@...linux.org.uk>,
        Jonathan Corbet <corbet@....net>,
        Richard Henderson <richard.henderson@...aro.org>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>,
        Vineet Gupta <vgupta@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Huacai Chen <chenhuacai@...nel.org>,
        WANG Xuerui <kernel@...0n.name>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Michal Simek <monstr@...str.eu>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        "James E . J . Bottomley" <James.Bottomley@...senpartnership.com>,
        Helge Deller <deller@....de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        "David S . Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-alpha@...r.kernel.org,
        linux-snps-arc@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-ia64@...r.kernel.org,
        loongarch@...ts.linux.dev, linux-m68k@...ts.linux-m68k.org,
        linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
        linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
        sparclinux@...r.kernel.org,
        Linux-Arch <linux-arch@...r.kernel.org>,
        Palmer Dabbelt <palmer@...osinc.com>
Subject: Re: [PATCH v3 03/24] arm: Remove COMMAND_LINE_SIZE from uapi

On Thu, Feb 23, 2023 at 2:09 PM Arnd Bergmann <arnd@...db.de> wrote:
>
> On Thu, Feb 23, 2023, at 10:54, Alexandre Ghiti wrote:
> > On Wed, Feb 15, 2023 at 2:05 PM Arnd Bergmann <arnd@...db.de> wrote:
> >>
> >> On Wed, Feb 15, 2023, at 13:59, Russell King (Oracle) wrote:
> >> > On Tue, Feb 14, 2023 at 08:49:04AM +0100, Alexandre Ghiti wrote:
> >> >> From: Palmer Dabbelt <palmer@...osinc.com>
> >> >>
> >> >> As far as I can tell this is not used by userspace and thus should not
> >> >> be part of the user-visible API.
> >> >>
> >> >> Signed-off-by: Palmer Dabbelt <palmer@...osinc.com>
> >> >
> >> > Looks good to me. What's the merge plan for this?
> >>
> >> The easiest way is probably if I merge it through the whole
> >> series through the asm-generic tree. The timing is a bit
> >> unfortunate as we're just ahead of the merge window, so unless
> >> we really need this in 6.3, I'd suggest that Alexandre resend
> >> the series to me in two weeks with the Acks added in and I'll
> >> pick it up for 6.4.
> >
> > Sorry for the response delay, I was waiting to see if Palmer would
> > merge my KASAN patchset in 6.3 (which he does): I have to admit that
> > fixing the command line size + the KASAN patchset would allow 6.3 to
> > run on syzkaller, which would be nice.
> >
> > If I don't see this merged in 6.3, I'll send another round as you
> > suggested in 1 week now :)
>
> Hi Alexandre,
>
> I have no plans to still pick up the series for 6.3. The patches
> all look fine to me, but it's clearly too late now. What is the
> actual dependency for KASAN, do you just need a longer command
> line or something else? If it's just the command line size,
> I would suggest that Palmer can still pick up a oneline change
> to increase it and refer to this thread in the changelog as a
> reference for why it is not an actual UAPI break.

Indeed, we only need a longer command line size. I'll ask Palmer to do
that then, thanks!

Alex

>
>      Arnd