From: Thomas Gleixner <tglx@linutronix.de>
To: K Prateek Nayak <kprateek.nayak@amd.com>,
LKML <linux-kernel@vger.kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>,
linux-arch@vger.kernel.org, Peter Zilstra <peterz@infradead.org>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
"Paul E. McKenney" <paulmck@kernel.org>,
Boqun Feng <boqun.feng@gmail.com>,
Jonathan Corbet <corbet@lwn.net>,
Prakash Sangappa <prakash.sangappa@oracle.com>,
Madadi Vineeth Reddy <vineethr@linux.ibm.com>,
Steven Rostedt <rostedt@goodmis.org>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Subject: Re: [patch 06/12] rseq: Implement sys_rseq_slice_yield()
Date: Tue, 09 Sep 2025 14:23:38 +0200 [thread overview]
Message-ID: <87plbzvmph.ffs@tglx> (raw)
In-Reply-To: <47499513-7bf0-4393-ba89-5efd9c115c43@amd.com>
On Tue, Sep 09 2025 at 15:22, K. Prateek Nayak wrote:
> On 9/9/2025 4:30 AM, Thomas Gleixner wrote:
>> /* restartable sequence */
>> COND_SYSCALL(rseq);
>> +COND_SYSCALL(rseq_sched_yield);
>
> I'm not sure if it is my toolchain but when I try to build a version
> with CONFIG_RSEQ_SLICE_EXTENSION disabled, I see:
>
> ld: vmlinux.o: in function `x64_sys_call':
> arch/x86/include/generated/asm/syscalls_64.h:471: undefined reference to `__x64_sys_rseq_slice_yield'
> ld: vmlinux.o: in function `ia32_sys_call':
> arch/x86/include/generated/asm/syscalls_32.h:471: undefined reference to `__ia32_sys_rseq_slice_yield'
> ld: vmlinux.o:(.rodata+0x12d0): undefined reference to `__x64_sys_rseq_slice_yield'
>
> I would have assumed the COND_SYSCALL() above would have stubbed this
> but that doesn't seem to be the case. Am I missing something?
Yes.
>> +COND_SYSCALL(rseq_sched_yield);
does not create a stub for rseq_slice_yield() obviously :)
/me looks for a brown paperbag.
next prev parent reply other threads:[~2025-09-09 12:23 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-08 22:59 [patch 00/12] rseq: Implement time slice extension mechanism Thomas Gleixner
2025-09-08 22:59 ` [patch 01/12] sched: Provide and use set_need_resched_current() Thomas Gleixner
2025-09-08 22:59 ` [patch 02/12] rseq: Add fields and constants for time slice extension Thomas Gleixner
2025-09-09 0:04 ` Randy Dunlap
2025-09-11 15:41 ` Mathieu Desnoyers
2025-09-11 15:49 ` Mathieu Desnoyers
2025-09-22 5:28 ` Prakash Sangappa
2025-09-22 5:57 ` K Prateek Nayak
2025-09-22 13:57 ` Mathieu Desnoyers
2025-09-22 13:55 ` Mathieu Desnoyers
2025-09-23 0:57 ` Prakash Sangappa
2025-09-08 22:59 ` [patch 03/12] rseq: Provide static branch for time slice extensions Thomas Gleixner
2025-09-09 3:10 ` K Prateek Nayak
2025-09-09 4:11 ` Randy Dunlap
2025-09-09 12:12 ` Thomas Gleixner
2025-09-09 16:01 ` Randy Dunlap
2025-09-11 15:42 ` Mathieu Desnoyers
2025-09-08 22:59 ` [patch 04/12] rseq: Add statistics " Thomas Gleixner
2025-09-11 15:43 ` Mathieu Desnoyers
2025-09-08 22:59 ` [patch 05/12] rseq: Add prctl() to enable " Thomas Gleixner
2025-09-11 15:50 ` Mathieu Desnoyers
2025-09-11 16:52 ` K Prateek Nayak
2025-09-11 17:18 ` Mathieu Desnoyers
2025-09-08 23:00 ` [patch 06/12] rseq: Implement sys_rseq_slice_yield() Thomas Gleixner
2025-09-09 9:52 ` K Prateek Nayak
2025-09-09 12:23 ` Thomas Gleixner [this message]
2025-09-10 11:15 ` K Prateek Nayak
2025-09-08 23:00 ` [patch 07/12] rseq: Implement syscall entry work for time slice extensions Thomas Gleixner
2025-09-10 5:22 ` K Prateek Nayak
2025-09-10 7:49 ` Thomas Gleixner
2025-09-08 23:00 ` [patch 08/12] rseq: Implement time slice extension enforcement timer Thomas Gleixner
2025-09-10 11:20 ` K Prateek Nayak
2025-09-08 23:00 ` [patch 09/12] rseq: Reset slice extension when scheduled Thomas Gleixner
2025-09-08 23:00 ` [patch 10/12] rseq: Implement rseq_grant_slice_extension() Thomas Gleixner
2025-09-09 8:14 ` K Prateek Nayak
2025-09-09 12:16 ` Thomas Gleixner
2025-09-08 23:00 ` [patch 11/12] entry: Hook up rseq time slice extension Thomas Gleixner
2025-09-08 23:00 ` [patch 12/12] selftests/rseq: Implement time slice extension test Thomas Gleixner
2025-09-10 11:23 ` K Prateek Nayak
2025-09-09 12:37 ` [patch 00/12] rseq: Implement time slice extension mechanism Thomas Gleixner
2025-09-10 4:42 ` K Prateek Nayak
2025-09-10 11:28 ` K Prateek Nayak
2025-09-10 14:50 ` Thomas Gleixner
2025-09-11 3:03 ` K Prateek Nayak
2025-09-11 7:36 ` Prakash Sangappa
2025-09-11 15:27 ` Mathieu Desnoyers
2025-09-11 20:18 ` Thomas Gleixner
2025-09-12 12:33 ` Mathieu Desnoyers
2025-09-12 16:31 ` Thomas Gleixner
2025-09-12 19:26 ` Mathieu Desnoyers
2025-09-13 13:02 ` Thomas Gleixner
2025-09-19 17:30 ` Prakash Sangappa
2025-09-22 14:09 ` Mathieu Desnoyers
2025-09-23 1:01 ` Prakash Sangappa
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