add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/misc/cxl/debugfs.c
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@@ -1,10 +1,6 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * Copyright 2014 IBM Corp.
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- *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of the GNU General Public License
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- * as published by the Free Software Foundation; either version
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- * 2 of the License, or (at your option) any later version.
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  */
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 #include <linux/debugfs.h>
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@@ -30,11 +26,11 @@
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 DEFINE_DEBUGFS_ATTRIBUTE(fops_io_x64, debugfs_io_u64_get, debugfs_io_u64_set,
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 			 "0x%016llx\n");
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-static struct dentry *debugfs_create_io_x64(const char *name, umode_t mode,
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-					    struct dentry *parent, u64 __iomem *value)
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+static void debugfs_create_io_x64(const char *name, umode_t mode,
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+				  struct dentry *parent, u64 __iomem *value)
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 {
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-	return debugfs_create_file_unsafe(name, mode, parent,
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-					  (void __force *)value, &fops_io_x64);
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+	debugfs_create_file_unsafe(name, mode, parent, (void __force *)value,
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+				   &fops_io_x64);
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 }
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 void cxl_debugfs_add_adapter_regs_psl9(struct cxl *adapter, struct dentry *dir)
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@@ -58,25 +54,22 @@
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 	debugfs_create_io_x64("trace", S_IRUSR | S_IWUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_TRACE));
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 }
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-int cxl_debugfs_adapter_add(struct cxl *adapter)
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+void cxl_debugfs_adapter_add(struct cxl *adapter)
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 {
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 	struct dentry *dir;
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 	char buf[32];
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 	if (!cxl_debugfs)
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-		return -ENODEV;
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+		return;
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 	snprintf(buf, 32, "card%i", adapter->adapter_num);
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 	dir = debugfs_create_dir(buf, cxl_debugfs);
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-	if (IS_ERR(dir))
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-		return PTR_ERR(dir);
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 	adapter->debugfs = dir;
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 	debugfs_create_io_x64("err_ivte", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_ErrIVTE));
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 	if (adapter->native->sl_ops->debugfs_add_adapter_regs)
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 		adapter->native->sl_ops->debugfs_add_adapter_regs(adapter, dir);
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-	return 0;
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 }
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 void cxl_debugfs_adapter_remove(struct cxl *adapter)
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@@ -100,18 +93,16 @@
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 	debugfs_create_io_x64("trace", S_IRUSR | S_IWUSR, dir, _cxl_p1n_addr(afu, CXL_PSL_SLICE_TRACE));
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 }
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-int cxl_debugfs_afu_add(struct cxl_afu *afu)
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+void cxl_debugfs_afu_add(struct cxl_afu *afu)
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 {
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 	struct dentry *dir;
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 	char buf[32];
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 	if (!afu->adapter->debugfs)
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-		return -ENODEV;
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+		return;
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 	snprintf(buf, 32, "psl%i.%i", afu->adapter->adapter_num, afu->slice);
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 	dir = debugfs_create_dir(buf, afu->adapter->debugfs);
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-	if (IS_ERR(dir))
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-		return PTR_ERR(dir);
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 	afu->debugfs = dir;
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 	debugfs_create_io_x64("sr",         S_IRUSR, dir, _cxl_p1n_addr(afu, CXL_PSL_SR_An));
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@@ -122,8 +113,6 @@
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 	if (afu->adapter->native->sl_ops->debugfs_add_afu_regs)
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 		afu->adapter->native->sl_ops->debugfs_add_afu_regs(afu, dir);
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-
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-	return 0;
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 }
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 void cxl_debugfs_afu_remove(struct cxl_afu *afu)
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@@ -131,19 +120,12 @@
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 	debugfs_remove_recursive(afu->debugfs);
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 }
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-int __init cxl_debugfs_init(void)
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+void __init cxl_debugfs_init(void)
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 {
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-	struct dentry *ent;
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-
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 	if (!cpu_has_feature(CPU_FTR_HVMODE))
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-		return 0;
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+		return;
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-	ent = debugfs_create_dir("cxl", NULL);
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-	if (IS_ERR(ent))
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-		return PTR_ERR(ent);
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-	cxl_debugfs = ent;
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-
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-	return 0;
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+	cxl_debugfs = debugfs_create_dir("cxl", NULL);
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 }
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 void cxl_debugfs_exit(void)