disable cpu isolcpus

hc

2023-12-09 958e46acc8e900e8569dd467c1af9b8d2d019394

 kernel/arch/powerpc/platforms/pseries/hvCall_inst.c
..
..
@@ -1,21 +1,8 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * Copyright (C) 2006 Mike Kravetz IBM Corporation
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  *
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  * Hypervisor Call Instrumentation
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
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- * the Free Software Foundation; either version 2 of the License, or
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- * (at your option) any later version.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, write to the Free Software
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- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
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  */
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7
 
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 #include <linux/kernel.h>
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..
@@ -83,31 +70,14 @@
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 	return 0;
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 }
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-static const struct seq_operations hcall_inst_seq_ops = {
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+static const struct seq_operations hcall_inst_sops = {
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         .start = hc_start,
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         .next  = hc_next,
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         .stop  = hc_stop,
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         .show  = hc_show
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 };
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-static int hcall_inst_seq_open(struct inode *inode, struct file *file)
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-{
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-	int rc;
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-	struct seq_file *seq;
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-
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-	rc = seq_open(file, &hcall_inst_seq_ops);
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-	seq = file->private_data;
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-	seq->private = file_inode(file)->i_private;
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-
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-	return rc;
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-}
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-
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-static const struct file_operations hcall_inst_seq_fops = {
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-	.open = hcall_inst_seq_open,
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-	.read = seq_read,
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-	.llseek = seq_lseek,
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-	.release = seq_release,
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-};
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+DEFINE_SEQ_ATTRIBUTE(hcall_inst);
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 #define	HCALL_ROOT_DIR		"hcall_inst"
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 #define CPU_NAME_BUF_SIZE	32
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@@ -142,7 +112,6 @@
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 static int __init hcall_inst_init(void)
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 {
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 	struct dentry *hcall_root;
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-	struct dentry *hcall_file;
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 	char cpu_name_buf[CPU_NAME_BUF_SIZE];
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 	int cpu;
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@@ -158,17 +127,12 @@
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 	}
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 	hcall_root = debugfs_create_dir(HCALL_ROOT_DIR, NULL);
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-	if (!hcall_root)
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-		return -ENOMEM;
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 	for_each_possible_cpu(cpu) {
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 		snprintf(cpu_name_buf, CPU_NAME_BUF_SIZE, "cpu%d", cpu);
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-		hcall_file = debugfs_create_file(cpu_name_buf, 0444,
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-						 hcall_root,
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-						 per_cpu(hcall_stats, cpu),
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-						 &hcall_inst_seq_fops);
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-		if (!hcall_file)
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-			return -ENOMEM;
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+		debugfs_create_file(cpu_name_buf, 0444, hcall_root,
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+				    per_cpu(hcall_stats, cpu),
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+				    &hcall_inst_fops);
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 	}
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 	return 0;