From 119e9db233ad0f4cbd4cfb9f9385a7bca378b37d Mon Sep 17 00:00:00 2001 From: Zeng Chi Date: Mon, 21 Sep 2026 18:24:42 +0800 Subject: KVM: Don't pre-reserve xarray entries when storing empty/NULL attributes Skip the xarray reservation loop when clearing all memory attributes, as storing NULL only erases the entry and never needs to allocate, so no reservation (and no cleanup of a failed one) is required in that case. Suggested-by: Sean Christopherson Cc: David Ballesteros Signed-off-by: Zeng Chi Link: https://patch.msgid.link/20260921102442.1232375-1-zeng_chi911@163.com [sean: split to separate patch] Signed-off-by: Sean Christopherson --- drivers/edac/debugfs.c | 91 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 91 insertions(+) create mode 100644 drivers/edac/debugfs.c (limited to 'drivers/edac/debugfs.c') diff --git a/drivers/edac/debugfs.c b/drivers/edac/debugfs.c new file mode 100644 index 000000000..447d0c620 --- /dev/null +++ b/drivers/edac/debugfs.c @@ -0,0 +1,91 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include "edac_module.h" + +static struct dentry *edac_debugfs; + +void __init edac_debugfs_init(void) +{ + edac_debugfs = debugfs_create_dir("edac", NULL); +} + +void edac_debugfs_exit(void) +{ + debugfs_remove_recursive(edac_debugfs); +} + +void edac_create_debugfs_nodes(struct mem_ctl_info *mci) +{ + mci->debugfs = debugfs_create_dir(mci->dev.kobj.name, edac_debugfs); +} + +/* Create a toplevel dir under EDAC's debugfs hierarchy */ +struct dentry *edac_debugfs_create_dir(const char *dirname) +{ + if (!edac_debugfs) + return NULL; + + return debugfs_create_dir(dirname, edac_debugfs); +} +EXPORT_SYMBOL_GPL(edac_debugfs_create_dir); + +/* Create a toplevel dir under EDAC's debugfs hierarchy with parent @parent */ +struct dentry * +edac_debugfs_create_dir_at(const char *dirname, struct dentry *parent) +{ + return debugfs_create_dir(dirname, parent); +} +EXPORT_SYMBOL_GPL(edac_debugfs_create_dir_at); + +/* + * Create a file under EDAC's hierarchy or a sub-hierarchy: + * + * @name: file name + * @mode: file permissions + * @parent: parent dentry. If NULL, it becomes the toplevel EDAC dir + * @data: private data of caller + * @fops: file operations of this file + */ +struct dentry * +edac_debugfs_create_file(const char *name, umode_t mode, struct dentry *parent, + void *data, const struct file_operations *fops) +{ + if (!parent) + parent = edac_debugfs; + + return debugfs_create_file(name, mode, parent, data, fops); +} +EXPORT_SYMBOL_GPL(edac_debugfs_create_file); + +/* Wrapper for debugfs_create_x8() */ +void edac_debugfs_create_x8(const char *name, umode_t mode, + struct dentry *parent, u8 *value) +{ + if (!parent) + parent = edac_debugfs; + + debugfs_create_x8(name, mode, parent, value); +} +EXPORT_SYMBOL_GPL(edac_debugfs_create_x8); + +/* Wrapper for debugfs_create_x16() */ +void edac_debugfs_create_x16(const char *name, umode_t mode, + struct dentry *parent, u16 *value) +{ + if (!parent) + parent = edac_debugfs; + + debugfs_create_x16(name, mode, parent, value); +} +EXPORT_SYMBOL_GPL(edac_debugfs_create_x16); + +/* Wrapper for debugfs_create_x32() */ +void edac_debugfs_create_x32(const char *name, umode_t mode, + struct dentry *parent, u32 *value) +{ + if (!parent) + parent = edac_debugfs; + + debugfs_create_x32(name, mode, parent, value); +} +EXPORT_SYMBOL_GPL(edac_debugfs_create_x32); -- cgit v1.3.1