linux-kernel - Re: [PATCH 00/30] PREEMPT_AUTO: support lazy rescheduling

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Date: Thu, 15 Feb 2024 21:04:00 +0100
From: Thomas Gleixner <tglx@...utronix.de>
To: paulmck@...nel.org, Ankur Arora <ankur.a.arora@...cle.com>
Cc: linux-kernel@...r.kernel.org, peterz@...radead.org,
 torvalds@...ux-foundation.org, akpm@...ux-foundation.org, luto@...nel.org,
 bp@...en8.de, dave.hansen@...ux.intel.com, hpa@...or.com,
 mingo@...hat.com, juri.lelli@...hat.com, vincent.guittot@...aro.org,
 willy@...radead.org, mgorman@...e.de, jpoimboe@...nel.org,
 mark.rutland@....com, jgross@...e.com, andrew.cooper3@...rix.com,
 bristot@...nel.org, mathieu.desnoyers@...icios.com,
 glaubitz@...sik.fu-berlin.de, anton.ivanov@...bridgegreys.com,
 mattst88@...il.com, krypton@...ich-teichert.org, rostedt@...dmis.org,
 David.Laight@...lab.com, richard@....at, jon.grimm@....com,
 bharata@....com, boris.ostrovsky@...cle.com, konrad.wilk@...cle.com
Subject: Re: [PATCH 00/30] PREEMPT_AUTO: support lazy rescheduling

On Thu, Feb 15 2024 at 11:28, Paul E. McKenney wrote:
> On Wed, Feb 14, 2024 at 07:45:18PM -0800, Paul E. McKenney wrote:
> I am also getting these from builds that enable KASAN:
>
> vmlinux.o: warning: objtool: mwait_idle+0x13: call to tif_resched.constprop.0() leaves .noinstr.text section
> vmlinux.o: warning: objtool: acpi_processor_ffh_cstate_enter+0x36: call to tif_resched.constprop.0() leaves .noinstr.text section
> vmlinux.o: warning: objtool: cpu_idle_poll.isra.0+0x18: call to tif_resched.constprop.0() leaves .noinstr.text section
> vmlinux.o: warning: objtool: acpi_safe_halt+0x0: call to tif_resched.constprop.0() leaves .noinstr.text section
> vmlinux.o: warning: objtool: poll_idle+0x33: call to tif_resched.constprop.0() leaves .noinstr.text section
> vmlinux.o: warning: objtool: default_enter_idle+0x18: call to tif_resched.constprop.0() leaves .noinstr.text section
>
> Does tif_resched() need to be marked noinstr or some such?

__always_inline() probably