Message-ID: <07fd3a6cea0abfa794483fa40feb0bfec0410efe.camel@infradead.org>
Subject: Re: [PATCH v14 05/12] x86/smpboot: Split up native_cpu_up into
 separate phases and document them
From:   David Woodhouse <dwmw2@infradead.org>
To:     Thomas Gleixner <tglx@linutronix.de>,
        Usama Arif <usama.arif@bytedance.com>, kim.phillips@amd.com,
        brgerst@gmail.com
Cc:     piotrgorski@cachyos.org, oleksandr@natalenko.name,
        arjan@linux.intel.com, mingo@redhat.com, bp@alien8.de,
        dave.hansen@linux.intel.com, hpa@zytor.com, x86@kernel.org,
        pbonzini@redhat.com, paulmck@kernel.org,
        linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
        rcu@vger.kernel.org, mimoja@mimoja.de, hewenliang4@huawei.com,
        thomas.lendacky@amd.com, seanjc@google.com, pmenzel@molgen.mpg.de,
        fam.zheng@bytedance.com, punit.agrawal@bytedance.com,
        simon.evans@bytedance.com, liangma@liangbit.com,
        "Guilherme G . Piccoli" <gpiccoli@igalia.com>
Date:   Sat, 11 Mar 2023 10:21:12 +0000
In-Reply-To: <87ttyrabn5.ffs@tglx>
References: <20230308171328.1562857-1-usama.arif@bytedance.com>
         <20230308171328.1562857-6-usama.arif@bytedance.com> <87ttyrabn5.ffs@tglx>
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On Sat, 2023-03-11 at 11:19 +0200, Thomas Gleixner wrote:
> On Wed, Mar 08 2023 at 17:13, Usama Arif wrote:
> > =C2=A0
> > +int native_cpu_up(unsigned int cpu, struct task_struct *tidle)
> > +{
> > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0int ret;
> > +
> > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0ret =3D do_cpu_up(cpu, tidle=
);
> > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0if (ret)
> > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0return ret;
>=20
> In case of error this leaves the warm reset vector dangling.
>=20
> > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0ret =3D do_wait_cpu_initiali=
zed(cpu);
> > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0if (ret)
> > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0return ret;
> > +
> > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0ret =3D do_wait_cpu_callin(c=
pu);
> > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0if (ret)
> > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0return ret;
>=20
> Same for these two error returns.
>=20
> Thanks,
>=20
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 tglx

On top of the idle_thread_get() one. Pushed to=20
https://git.infradead.org/users/dwmw2/linux.git/shortlog/refs/heads/paralle=
l-6.2-v15

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 980cc2c4a84f..895395787afc 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1347,25 +1347,23 @@ int native_cpu_up(unsigned int cpu, struct task_str=
uct *tidle)
 	if (!do_parallel_bringup) {
 		ret =3D do_cpu_up(cpu, tidle);
 		if (ret)
-			return ret;
+			goto out;
 	}
=20
 	ret =3D do_wait_cpu_initialized(cpu);
 	if (ret)
-		return ret;
+		goto out;
=20
 	ret =3D do_wait_cpu_callin(cpu);
 	if (ret)
-		return ret;
+		goto out;
=20
 	ret =3D do_wait_cpu_online(cpu);
=20
-	if (x86_platform.legacy.warm_reset) {
-		/*
-		 * Cleanup possible dangling ends...
-		 */
+ out:
+	/* Cleanup possible dangling ends... */
+	if (x86_platform.legacy.warm_reset)
 		smpboot_restore_warm_reset_vector();
-	}
=20
 	return ret;
 }
@@ -1373,7 +1371,7 @@ int native_cpu_up(unsigned int cpu, struct task_struc=
t *tidle)
 /* Bringup step one: Send INIT/SIPI to the target AP */
 static int native_cpu_kick(unsigned int cpu)
 {
-	return do_cpu_up(cpu, idle_thread_get(cpu));
+	return do_cpu_up(cpu, idle_thread_get(cpu, true));
 }
=20
 /**


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