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From: sashiko-bot@kernel.org
Subject: Re: [PATCH] s390/time: Use jiffies instead of jiffies_64
Reply-To: sashiko-reviews@lists.linux.dev
To: "Heiko Carstens" <hca@linux.ibm.com>
Cc: "Alexander Gordeev" <agordeev@linux.ibm.com>, "Christian Borntraeger" <borntraeger@linux.ibm.vom>, "Vasily
 Gorbik" <gor@linux.ibm.com>, linux-s390@vger.kernel.org, "Heiko Carstens" <hca@linux.ibm.com>
In-Reply-To: <20260813132505.3691502-1-hca@linux.ibm.com>
References: <20260813132505.3691502-1-hca@linux.ibm.com>
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Date: Thu, 13 Aug 2026 13:48:07 +0000
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> Christoph Schlameuss and Alexander Egorenkov reported a data-race
> reported by KCSAN when jiffies_64 is read:
>=20
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> BUG: KCSAN: data-race in do_account_vtime / tick_do_update_jiffies64
>=20
> write to 0x0000016599ea8600 of 8 bytes by interrupt on cpu 6:
>  tick_do_update_jiffies64+0x140/0x250
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D>
> BUG: KCSAN: data-race in do_account_vtime / tick_do_update_ji>
>=20
> write to 0x0000016599ea8600 of 8 bytes by interrupt on cpu 6:
>  tick_do_update_jiffies64+0x140/0x250
>  tick_nohz_handler+0x2e6/0x300
>  __run_hrtimer+0x156/0x4d0
> [ ... ]
>=20
> Fixes: f341b8dff982 ("s390/vtime: limit MT scaling value updates")
> Reported-by: Christoph Schlameuss <schlameuss@linux.ibm.com>
> Reported-by: Alexander Egorenkov <egorenar@linux.ibm.com>
> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

Sashiko has reviewed this patch and found no issues. It looks great!

--=20
Sashiko AI review =C2=B7 https://sashiko.dev/#/patchset/20260813132505.3691=
502-1-hca@linux.ibm.com?part=3D1