linux-kernel - Re: [PATCHSET] saner elf compat

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Message-ID: <20201215195414.GA15551@alpha.franken.de>
Date:   Tue, 15 Dec 2020 20:54:14 +0100
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        linux-mips@...r.kernel.org, Randy Dunlap <rdunlap@...radead.org>
Subject: Re: [PATCHSET] saner elf compat

On Thu, Dec 03, 2020 at 11:03:36PM +0000, Al Viro wrote:
> On Thu, Dec 03, 2020 at 02:09:04PM -0800, Linus Torvalds wrote:
> > On Thu, Dec 3, 2020 at 1:46 PM Al Viro <viro@...iv.linux.org.uk> wrote:
> > >
> > >  The answer (for mainline) is that mips compat does *NOT* want
> > > COMPAT_BINFMT_ELF.  Not a problem with that series, though, so I'd
> > > retested it (seems to work, both for x86_64 and mips64, execs and
> > > coredumps for all ABIs alike), with centralization of Kconfig logics
> > > thrown in.
> > 
> > Well, the diffstat looks nice:
> > 
> > >  26 files changed, 127 insertions(+), 317 deletions(-)
> > 
> > and the patches didn't trigger anything for me, but how much did this
> > get tested? Do you actually have both kinds of 32-bit elf mips
> > binaries around and a machine to test on?
> 
> Yes (aptitude install gcc-multilib on debian mips64el/stretch sets the toolchain
> and libraries just fine, and then it's just a matter of -mabi=n32 passed
> to gcc).  "Machine" is qemu-system-mips64el -machine malta -m 1024 -cpu 5KEc
> and the things appear to work; I hadn't tried that on the actual hardware.
> I do have a Loongson-2 box, but it would take a while to dig it out and
> get it up-to-date.
> 
> > Linux-mips was cc'd, but I'm adding Thomas B to the cc here explicitly
> > just so that he has a heads-up on this thing and can go and look at
> > the mailing list in case it goes to a separate mailbox for him..
> 
> I would certainly appreciate review and testing - this branch sat
> around in the "should post it someday" state since June (it was
> one of the followups grown from regset work back then), and I'm
> _not_ going to ask pulling it without an explicit OK from mips
> folks.

I've tested it on real hardware and so far everything looks good.

You can add my

Acked-by: Thomas Bogendoerfer <tsbogend@...ha.franken.de>

for the MIPS part.

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]