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From: Willy Tarreau <w@1wt.eu>
To: "Thomas Weißschuh" <thomas@t-8ch.de>
Cc: Zhangjin Wu <falcon@tinylab.org>,
	linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
	linux-riscv@lists.infradead.org, palmer@dabbelt.com,
	paul.walmsley@sifive.com
Subject: Re: [PATCH 00/13] tools/nolibc: riscv: Add full rv32 support
Date: Mon, 29 May 2023 13:31:43 +0200	[thread overview]
Message-ID: <20230529113143.GB2762@1wt.eu> (raw)
In-Reply-To: <f7332511-bb3f-4067-a0af-b6880294eded@t-8ch.de>

Hi Thomas,

On Mon, May 29, 2023 at 10:45:40AM +0200, Thomas Weißschuh wrote:
> <lots of implementation>
> 
> > usage:
> > 
> >     $ gcc -o nolibc-test tools/testing/selftests/nolibc/nolibc-test.c
> >     $ ./nolibc-test
> >     ...
> >     35 gettimeofday_tz = 0                                           [OK]
> >     36 gettimeofday_tv_tz = 0                                        [OK]
> >     37 gettimeofday_bad1 = -1                                       [FAIL] (continued by sigaction/siglongjmp/sigsetjmp)
> >     38 gettimeofday_bad2 = -1                                       [FAIL] (continued by sigaction/siglongjmp/sigsetjmp)
> >     39 getpagesize = 0                                               [OK]
> >     40 ioctl_tiocinq = 0                                             [OK]
> >     41 ioctl_tiocinq = 0                                             [OK]
> >     ...
> > 
> > It did work as expected, but for nolibc, we still need to add sigaction/siglongjump/sigsetjmp support.
> > 
> > Will send a patch based on Willy's latest branch, perhaps this may help us to
> > verify the future sigaction/siglongjump/sigsetjmp for nolibc.
> > 
> > ref: https://www.ibm.com/docs/en/i/7.1?topic=ssw_ibm_i_71/apis/sigsetj.html
> >      https://www.ibm.com/docs/en/zos/2.1.0?topic=functions-siglongjmp-restore-stack-environment-signal-mask
> 
> This seems very complicated for fairly limited gain to be honest.

I agree as well. I'm not denying the fact that one day we may want to
support signal, longjmp and friends but I'm not convinced we want to
go through that just to make a few uncertain tests succeed.

> If we really want to keep the current testcase we could also ensure that
> the pointer does not fall into the first page, as the first page is not
> mapped under Linux:
> 
> 0 <= addr < PAGE_SIZE
> 
> Or instead of PAGE_SIZE just hardcode 4096, as that should be the
> minimum size and and does not require a lookup.

I would not even do that. It brings nothing to the application layer and
inflates the code. I'd rather just get rid of the EFAULT test cases that
rely on an unreliable syscall (i.e. one that may either be a real syscall
or an emulated one). The value brought by these tests is extremely low
and they were implemented only because they were easy to do. If they're
causing pain, let's just drop them.

Willy

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  reply	other threads:[~2023-05-29 11:32 UTC|newest]

Thread overview: 60+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-05-24 17:33 [PATCH 00/13] tools/nolibc: riscv: Add full rv32 support Zhangjin Wu
2023-05-24 17:41 ` [PATCH 01/13] Revert "tools/nolibc: riscv: Support __NR_llseek for rv32" Zhangjin Wu
2023-05-24 17:44 ` [PATCH 02/13] Revert "selftests/nolibc: Fix up compile error " Zhangjin Wu
2023-05-24 17:48 ` [PATCH 04/13] selftests/nolibc: syscall_args: use __NR_statx for rv32 Zhangjin Wu
2023-05-24 19:49   ` Thomas Weißschuh
2023-05-25  7:20     ` Zhangjin Wu
2023-05-26  9:21   ` Arnd Bergmann
2023-05-26 10:06     ` Willy Tarreau
2023-05-27  0:58     ` Zhangjin Wu
2023-05-24 17:50 ` [PATCH 05/13] selftests/nolibc: riscv: customize makefile " Zhangjin Wu
2023-05-26  6:57   ` Thomas Weißschuh
2023-05-26  9:20     ` Zhangjin Wu
2023-05-24 17:52 ` [PATCH 06/13] selftests/nolibc: allow specify a bios for qemu Zhangjin Wu
2023-05-26  7:00   ` Thomas Weißschuh
2023-05-26 10:25     ` Zhangjin Wu
2023-05-26 10:36       ` Conor Dooley
2023-05-26 13:38         ` Zhangjin Wu
2023-05-26 15:08           ` Conor Dooley
2023-05-28  7:52     ` Willy Tarreau
2023-05-24 17:54 ` [PATCH 07/13] selftests/nolibc: remove the duplicated gettimeofday_bad2 Zhangjin Wu
2023-05-24 17:55 ` [PATCH 08/13] tools/nolibc: sys_lseek: riscv: use __NR_llseek for rv32 Zhangjin Wu
2023-05-24 17:57 ` [PATCH 09/13] tools/nolibc: sys_poll: riscv: use __NR_ppoll_time64 " Zhangjin Wu
2023-05-26  7:15   ` Thomas Weißschuh
2023-05-26  9:34     ` Arnd Bergmann
2023-05-28  8:25       ` Zhangjin Wu
2023-05-28  8:48         ` Arnd Bergmann
2023-05-28 10:29         ` Willy Tarreau
2023-05-28 10:55           ` Arnd Bergmann
2023-05-28 11:03             ` Willy Tarreau
2023-05-24 17:58 ` [PATCH 10/13] tools/nolibc: ppoll/ppoll_time64: add a missing argument Zhangjin Wu
2023-05-24 17:59 ` [PATCH 11/13] tools/nolibc: sys_select: riscv: use __NR_pselect6_time64 for rv32 Zhangjin Wu
2023-05-24 20:22   ` Thomas Weißschuh
2023-05-25  7:10     ` Zhangjin Wu
2023-05-25  7:22       ` Thomas Weißschuh
2023-05-26  1:50         ` Zhangjin Wu
2023-05-26  9:19   ` Arnd Bergmann
2023-05-26 11:00     ` [PATCH 00/13] tools/nolibc: riscv: Add full rv32 support Zhangjin Wu
2023-05-26 11:13       ` Arnd Bergmann
2023-05-24 18:02 ` [PATCH 12/13] tools/nolibc: sys_wait4: riscv: use __NR_waitid for rv32 Zhangjin Wu
2023-05-24 18:03 ` [PATCH 13/13] tools/nolibc: sys_gettimeofday: riscv: use __NR_clock_gettime64 " Zhangjin Wu
2023-05-26  7:38   ` Thomas Weißschuh
2023-05-27  1:26     ` Zhangjin Wu
2023-05-27  3:39       ` Zhangjin Wu
2023-05-27  5:12       ` Willy Tarreau
2023-05-24 18:24 ` [PATCH 00/13] tools/nolibc: riscv: Add full rv32 support Zhangjin Wu
2023-05-24 18:28 ` [PATCH 03/13] selftests/nolibc: print name instead of number for EOVERFLOW Zhangjin Wu
2023-05-24 17:46   ` Zhangjin Wu
2023-05-24 20:23   ` Thomas Weißschuh
2023-05-28  7:59 ` [PATCH 00/13] tools/nolibc: riscv: Add full rv32 support Willy Tarreau
2023-05-28  8:42   ` Thomas Weißschuh
2023-05-28  9:41     ` Thomas Weißschuh
2023-05-28 10:17       ` Willy Tarreau
2023-05-28 10:39   ` Zhangjin Wu
2023-05-28 11:33     ` Willy Tarreau
2023-05-28 12:52       ` Zhangjin Wu
2023-05-28 13:45     ` Thomas Weißschuh 
2023-05-28 18:39       ` Zhangjin Wu
2023-05-29  8:45         ` Thomas Weißschuh
2023-05-29 11:31           ` Willy Tarreau [this message]
2023-05-30 10:06             ` Zhangjin Wu

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