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Fri, 27 Mar 2026 06:31:36 +0000 (GMT) From: Shrikanth Hegde To: maddy@linux.ibm.com, linuxppc-dev@lists.ozlabs.org, yury.norov@gmail.com, linux@rasmusvillemoes.dk, linux-kernel@vger.kernel.org Cc: sshegde@linux.ibm.com, chleroy@kernel.org Subject: [PATCH 2/2] powerpc: Few misc cpumask code refactors Date: Fri, 27 Mar 2026 12:01:29 +0530 Message-ID: <20260327063129.127302-3-sshegde@linux.ibm.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260327063129.127302-1-sshegde@linux.ibm.com> References: <20260327063129.127302-1-sshegde@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-GUID: C2tF857s3sQbM-YVNdfDikMNihNPWZUY X-Proofpoint-ORIG-GUID: L-A2DitEj_39Y-BNmfrcU4Wr2z7uC6St X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzI3MDA0NSBTYWx0ZWRfX8RnHgLGvt73J CNkWt21gg+e3e9wb7JYk3IPnfu84IsNiE8kXBr4Cp23z5jSxL1WJyJYY3vunC/RZO8bqVLZwSAF 87g2RjUu7AAkkXbcuwAB4rX3JTrpOG8gT/qN0kxRb2P6EL1uOQuEKnfDwz1geiUoyB3Ff40NO1V R+lQ0mL8pmhD6Ue7DRyIC/v2NNbN7UX5TAHo1eN5SvDj5qppNhmRkl1wCXZSO9fZ1Oxt0MM/bdA zezaqXAr23x2FzFnEGgdfEmxeclyqgYb0AOW4cP8mcpTUnNhuumY7G35atq+Q9BpTN/6/4fFm2l BITDc3RhP4K6BYTTSEIK1uyTskhNiQkXMFHX10j4fL+xboxa4Rx22N3vNDMnaV6mnaWfHrtKGJ0 VruLRhbvpwNp9957sC5cMPOEcwtFi7T55LKBbdk3da3adrRwCUIuudLZ8Lf76hI6gSCwNZ6QguW Z4rrhidjs5nKFukg36A== X-Authority-Analysis: v=2.4 cv=KbXfcAYD c=1 sm=1 tr=0 ts=69c6244f cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=Yq5XynenixoA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VnNF1IyMAAAA:8 a=eCrYNZafU3mwZKoKmgAA:9 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-26_04,2026-03-26_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 impostorscore=0 malwarescore=0 adultscore=0 clxscore=1015 priorityscore=1501 bulkscore=0 lowpriorityscore=0 phishscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603270045 Content-Type: text/plain; charset="utf-8" A few miscellanous changes in handling cpumask api's in the order they appear: - cpumask_next(cpu, mask) >=3D nr_cpu_ids is used to determine if cpu is the last CPU.=20 - cpumask_next can take -1 as valid argument. So simplify cpuinfo iterator. /proc/cpuinfo shows same info with patch. - cpumask_weight can't be more than nr_cpu_ids. So remove the pointless comparison. Signed-off-by: Shrikanth Hegde Reviewed-by: Yury Norov --- arch/powerpc/kernel/setup-common.c | 7 ++----- arch/powerpc/sysdev/xive/common.c | 7 +++---- 2 files changed, 5 insertions(+), 9 deletions(-) diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup= -common.c index b1761909c23f..47215eab296b 100644 --- a/arch/powerpc/kernel/setup-common.c +++ b/arch/powerpc/kernel/setup-common.c @@ -323,7 +323,7 @@ static int show_cpuinfo(struct seq_file *m, void *v) seq_putc(m, '\n'); =20 /* If this is the last cpu, print the summary */ - if (cpumask_next(cpu_id, cpu_online_mask) >=3D nr_cpu_ids) + if (cpu_id =3D=3D cpumask_last(cpu_online_mask)) show_cpuinfo_summary(m); =20 return 0; @@ -331,10 +331,7 @@ static int show_cpuinfo(struct seq_file *m, void *v) =20 static void *c_start(struct seq_file *m, loff_t *pos) { - if (*pos =3D=3D 0) /* just in case, cpu 0 is not the first */ - *pos =3D cpumask_first(cpu_online_mask); - else - *pos =3D cpumask_next(*pos - 1, cpu_online_mask); + *pos =3D cpumask_next(*pos - 1, cpu_online_mask); if ((*pos) < nr_cpu_ids) return (void *)(unsigned long)(*pos + 1); return NULL; diff --git a/arch/powerpc/sysdev/xive/common.c b/arch/powerpc/sysdev/xive/c= ommon.c index b6446abe29a6..91dd3b364d7d 100644 --- a/arch/powerpc/sysdev/xive/common.c +++ b/arch/powerpc/sysdev/xive/common.c @@ -548,11 +548,10 @@ static void xive_dec_target_count(int cpu) static int xive_find_target_in_mask(const struct cpumask *mask, unsigned int fuzz) { - int cpu, first, num, i; + int cpu, first, i; =20 - /* Pick up a starting point CPU in the mask based on fuzz */ - num =3D min_t(int, cpumask_weight(mask), nr_cpu_ids); - first =3D fuzz % num; + /* Pick up a starting point CPU in the mask based on fuzz */ + first =3D fuzz % cpumask_weight(mask); =20 /* Locate it */ cpu =3D cpumask_first(mask); --=20 2.47.3