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

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Date: Thu, 15 Feb 2024 12:54:59 -0800
From: "Paul E. McKenney" <paulmck@...nel.org>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: Ankur Arora <ankur.a.arora@...cle.com>, 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 09:04:00PM +0100, Thomas Gleixner wrote:
> 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

That does the trick, thank you!

							Thanx, Paul

------------------------------------------------------------------------

diff --git a/include/linux/thread_info.h b/include/linux/thread_info.h
index 8752dbc2dac75..43b729935804e 100644
--- a/include/linux/thread_info.h
+++ b/include/linux/thread_info.h
@@ -81,7 +81,7 @@ typedef enum {
  * reduce to the same value (TIF_NEED_RESCHED) leaving any scheduling behaviour
  * unchanged.
  */
-static inline int tif_resched(resched_t rs)
+static __always_inline int tif_resched(resched_t rs)
 {
 	return TIF_NEED_RESCHED + rs * TIF_NEED_RESCHED_LAZY_OFFSET;
 }