linux-kernel - Re: [PATCH v4 00/31] ARM: Switch to generic entry

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Message-ID: <20250220143040.GA24540@strace.io>
Date: Thu, 20 Feb 2025 16:30:40 +0200
From: "Dmitry V. Levin" <ldv@...ace.io>
To: Linus Walleij <linus.walleij@...aro.org>
Cc: Dmitry Vyukov <dvyukov@...gle.com>, Oleg Nesterov <oleg@...hat.com>,
	Eugene Syromyatnikov <evgsyr@...il.com>,
	Russell King <linux@...linux.org.uk>, Kees Cook <kees@...nel.org>,
	Andy Lutomirski <luto@...capital.net>,
	Will Drewry <wad@...omium.org>,
	Frederic Weisbecker <frederic@...nel.org>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	Jinjie Ruan <ruanjinjie@...wei.com>, Arnd Bergmann <arnd@...db.de>,
	Ard Biesheuvel <ardb@...nel.org>, Al Viro <viro@...iv.linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 00/31] ARM: Switch to generic entry

On Thu, Feb 20, 2025 at 03:04:22PM +0100, Linus Walleij wrote:
> On Fri, Feb 14, 2025 at 12:05 PM Dmitry V. Levin <ldv@...ace.io> wrote:
> 
> > > Sure, where can I find this test suite?
> >
> > It's a part of strace, you can find it e.g. at
> > https://github.com/strace/strace
> >
> > To build and run it one can roughly do
> > ./bootstrap && ./configure && make -j`nproc` && make -j`nproc check
> 
> make check produces some test failures on v6.14-rc1 on ARM
> even before I apply the generic entry:
> 
> FAIL: filtering_syscall-syntax.test
> FAIL: qual_fault-syscall.test
> FAIL: qual_fault.test
> FAIL: strace--tips-full.test
> FAIL: strace-r.test

This is surprising, no tests are currently known to fail on arm.

> Then there is the fact that I had to add the  PTRACE_SYSEMU and
> PTRACE_SYSEMU_SINGLESTEP as stubs returning -EIO
> (modeled after UM) to use generic entry. Do you think this affects
> the results?

No, strace doesn't use PTRACE_SYSEMU* and doesn't test it either.

> Is there a way to run a single test? I tried to check the docs but
> nothing obvious to me ... I guess I'm not used to this unit-tester.

Sure, it's a regular automake-based test suite, so you can do something like
$ make -s -k check VERBOSE=1 TESTS='filtering_syscall-syntax.test qual_fault-syscall.test qual_fault.test'


-- 
ldv