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Message-ID: <4c042dd9-50d6-401a-bce7-d22213b07bca@nvidia.com>
Date: Wed, 23 Apr 2025 10:24:33 +0100
From: Jon Hunter <jonathanh@...dia.com>
To: James Clark <james.clark@...aro.org>, Namhyung Kim <namhyung@...nel.org>,
Arnd Bergmann <arnd@...aro.org>
Cc: Jiri Olsa <jolsa@...nel.org>, Adrian Hunter <adrian.hunter@...el.com>,
Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...nel.org>,
LKML <linux-kernel@...r.kernel.org>, linux-perf-users@...r.kernel.org,
linux-arch@...r.kernel.org, Arnaldo Carvalho de Melo <acme@...nel.org>,
Ian Rogers <irogers@...gle.com>, Kan Liang <kan.liang@...ux.intel.com>,
"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH 05/10] tools headers: Update the syscall table with the
kernel sources
On 16/04/2025 14:26, James Clark wrote:
>
>
> On 14/04/2025 5:28 pm, James Clark wrote:
>>
>>
>> On 10/04/2025 1:11 am, Namhyung Kim wrote:
>>> To pick up the changes in:
>>>
>>> c4a16820d9019940 fs: add open_tree_attr()
>>> 2df1ad0d25803399 x86/arch_prctl: Simplify sys_arch_prctl()
>>> e632bca07c8eef1d arm64: generate 64-bit syscall.tbl
>>>
>>> This is basically to support the new open_tree_attr syscall. But it
>>> also needs to update asm-generic unistd.h header to get the new syscall
>>> number. And arm64 unistd.h header was converted to use the generic
>>> 64-bit header.
>>>
>>> Addressing this perf tools build warning:
>>>
>>> Warning: Kernel ABI header differences:
>>> diff -u tools/scripts/syscall.tbl scripts/syscall.tbl
>>> diff -u tools/perf/arch/x86/entry/syscalls/syscall_32.tbl arch/
>>> x86/entry/syscalls/syscall_32.tbl
>>> diff -u tools/perf/arch/x86/entry/syscalls/syscall_64.tbl arch/
>>> x86/entry/syscalls/syscall_64.tbl
>>> diff -u tools/perf/arch/powerpc/entry/syscalls/syscall.tbl arch/
>>> powerpc/kernel/syscalls/syscall.tbl
>>> diff -u tools/perf/arch/s390/entry/syscalls/syscall.tbl arch/
>>> s390/kernel/syscalls/syscall.tbl
>>> diff -u tools/perf/arch/mips/entry/syscalls/syscall_n64.tbl
>>> arch/ mips/kernel/syscalls/syscall_n64.tbl
>>> diff -u tools/perf/arch/arm/entry/syscalls/syscall.tbl arch/arm/
>>> tools/syscall.tbl
>>> diff -u tools/perf/arch/sh/entry/syscalls/syscall.tbl arch/sh/
>>> kernel/syscalls/syscall.tbl
>>> diff -u tools/perf/arch/sparc/entry/syscalls/syscall.tbl arch/
>>> sparc/kernel/syscalls/syscall.tbl
>>> diff -u tools/perf/arch/xtensa/entry/syscalls/syscall.tbl arch/
>>> xtensa/kernel/syscalls/syscall.tbl
>>> diff -u tools/arch/arm64/include/uapi/asm/unistd.h arch/arm64/
>>> include/uapi/asm/unistd.h
>>> diff -u tools/include/uapi/asm-generic/unistd.h include/uapi/
>>> asm- generic/unistd.h
>>>
>>> Please see tools/include/uapi/README for further details.
>>>
>>> Cc: linux-arch@...r.kernel.org
>>> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
>>> ---
>>> tools/arch/arm64/include/uapi/asm/unistd.h | 24 +------------------
>>> tools/include/uapi/asm-generic/unistd.h | 4 +++-
>>> .../perf/arch/arm/entry/syscalls/syscall.tbl | 1 +
>>> .../arch/mips/entry/syscalls/syscall_n64.tbl | 1 +
>>> .../arch/powerpc/entry/syscalls/syscall.tbl | 1 +
>>> .../perf/arch/s390/entry/syscalls/syscall.tbl | 1 +
>>> tools/perf/arch/sh/entry/syscalls/syscall.tbl | 1 +
>>> .../arch/sparc/entry/syscalls/syscall.tbl | 1 +
>>> .../arch/x86/entry/syscalls/syscall_32.tbl | 3 ++-
>>> .../arch/x86/entry/syscalls/syscall_64.tbl | 1 +
>>> .../arch/xtensa/entry/syscalls/syscall.tbl | 1 +
>>> tools/scripts/syscall.tbl | 1 +
>>> 12 files changed, 15 insertions(+), 25 deletions(-)
>>>
>>> diff --git a/tools/arch/arm64/include/uapi/asm/unistd.h b/tools/arch/
>>> arm64/include/uapi/asm/unistd.h
>>> index 9306726337fe005e..df36f23876e863ff 100644
>>> --- a/tools/arch/arm64/include/uapi/asm/unistd.h
>>> +++ b/tools/arch/arm64/include/uapi/asm/unistd.h
>>> @@ -1,24 +1,2 @@
>>> /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
>>> -/*
>>> - * Copyright (C) 2012 ARM Ltd.
>>> - *
>>> - * This program is free software; you can redistribute it and/or modify
>>> - * it under the terms of the GNU General Public License version 2 as
>>> - * published by the Free Software Foundation.
>>> - *
>>> - * This program is distributed in the hope that it will be useful,
>>> - * but WITHOUT ANY WARRANTY; without even the implied warranty of
>>> - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>>> - * GNU General Public License for more details.
>>> - *
>>> - * You should have received a copy of the GNU General Public License
>>> - * along with this program. If not, see <http://www.gnu.org/
>>> licenses/>.
>>> - */
>>> -
>>> -#define __ARCH_WANT_RENAMEAT
>>> -#define __ARCH_WANT_NEW_STAT
>>> -#define __ARCH_WANT_SET_GET_RLIMIT
>>> -#define __ARCH_WANT_TIME32_SYSCALLS
>>> -#define __ARCH_WANT_MEMFD_SECRET
>>> -
>>> -#include <asm-generic/unistd.h>
>>> +#include <asm/unistd_64.h>
>>
>> Hi Namhyung,
>>
>> Since we're not including the generic syscalls here anymore we now
>> need to generate the syscall header file for the Perf build to work
>> (build error pasted at the end for reference).
>>
>> I had a go at adding the rule for it, but I saw that we'd need to pull
>> in quite a bit from the kernel so it was blurring the lines about the
>> separation of the tools/ folder. For example this file has the arm64
>> defs:
>>
>> arch/arm64/kernel/Makefile.syscalls
>>
>> To make this common part of the makefile work:
>>
>> scripts/Makefile.asm-headers
>>
>> Maybe we can just copy or reimplement Makefile.syscalls, but I'm not
>> even sure if Makefile.asm-headers will work with the tools/ build
>> structure so maybe that has to be re-implemented too. Adding Arnd to
>> see what he thinks.
>>
>> As far as I can tell this is a separate issue to the work that Charlie
>> and Ian did recently to build all arch's syscall numbers into Perf to
>> use for reporting, as this is requires a single header for the build.
>>
>> Thanks
>> James
>>
>> ---
>>
>> In file included from /usr/include/aarch64-linux-gnu/sys/syscall.h:24,
>> from evsel.c:4:
>> /home/jamcla02/workspace/linux/linux/tools/arch/arm64/include/uapi/
>> asm/ unistd.h:2:10: fatal error: asm/unistd_64.h: No such file or
>> directory
>> 2 | #include <asm/unistd_64.h>
>> | ^~~~~~~~~~~~~~~~~
>>
>>
>>
>
> Hmmm I see this was also mentioned a while ago here [1]. Maybe I can
> have another go at adding the makerule to generate the file. I'll
> probably start by including as much as possible from the existing make
> rules from the kernel side. I think something similar was already done
> for generating the sysreg defs in commit 02e85f74668e ("tools: arm64:
> Add a Makefile for generating sysreg-defs.h")
>
>
> [1]: https://lore.kernel.org/lkml/ZrO5HR9x2xyPKttx@google.com/T/
> #m269c1d3c64e3e0c96f45102d358d9583c69b722f
FWIW I am seeing this build issue too on ARM64 and these changes have
now landed in the mainline :-(
So would be great to get this fixed or reverted.
Jon
--
nvpublic
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