From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/mm/hwpoison-inject.c | 78 ++++++++++++---------------------------
1 files changed, 24 insertions(+), 54 deletions(-)
diff --git a/kernel/mm/hwpoison-inject.c b/kernel/mm/hwpoison-inject.c
index b6ac706..1ae1ebc 100644
--- a/kernel/mm/hwpoison-inject.c
+++ b/kernel/mm/hwpoison-inject.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
/* Inject a hwpoison memory failure on a arbitrary pfn */
#include <linux/module.h>
#include <linux/debugfs.h>
@@ -25,11 +26,6 @@
p = pfn_to_page(pfn);
hpage = compound_head(p);
- /*
- * This implies unable to support free buddy pages.
- */
- if (!get_hwpoison_page(p))
- return 0;
if (!hwpoison_filter_enable)
goto inject;
@@ -39,23 +35,20 @@
* This implies unable to support non-LRU pages.
*/
if (!PageLRU(hpage) && !PageHuge(p))
- goto put_out;
+ return 0;
/*
- * do a racy check with elevated page count, to make sure PG_hwpoison
- * will only be set for the targeted owner (or on a free page).
+ * do a racy check to make sure PG_hwpoison will only be set for
+ * the targeted owner (or on a free page).
* memory_failure() will redo the check reliably inside page lock.
*/
err = hwpoison_filter(hpage);
if (err)
- goto put_out;
+ return 0;
inject:
pr_info("Injecting memory failure at pfn %#lx\n", pfn);
- return memory_failure(pfn, MF_COUNT_INCREASED);
-put_out:
- put_hwpoison_page(p);
- return 0;
+ return memory_failure(pfn, 0);
}
static int hwpoison_unpoison(void *data, u64 val)
@@ -66,8 +59,8 @@
return unpoison_memory(val);
}
-DEFINE_SIMPLE_ATTRIBUTE(hwpoison_fops, NULL, hwpoison_inject, "%lli\n");
-DEFINE_SIMPLE_ATTRIBUTE(unpoison_fops, NULL, hwpoison_unpoison, "%lli\n");
+DEFINE_DEBUGFS_ATTRIBUTE(hwpoison_fops, NULL, hwpoison_inject, "%lli\n");
+DEFINE_DEBUGFS_ATTRIBUTE(unpoison_fops, NULL, hwpoison_unpoison, "%lli\n");
static void pfn_inject_exit(void)
{
@@ -76,63 +69,40 @@
static int pfn_inject_init(void)
{
- struct dentry *dentry;
-
hwpoison_dir = debugfs_create_dir("hwpoison", NULL);
- if (hwpoison_dir == NULL)
- return -ENOMEM;
/*
* Note that the below poison/unpoison interfaces do not involve
* hardware status change, hence do not require hardware support.
* They are mainly for testing hwpoison in software level.
*/
- dentry = debugfs_create_file("corrupt-pfn", 0200, hwpoison_dir,
- NULL, &hwpoison_fops);
- if (!dentry)
- goto fail;
+ debugfs_create_file("corrupt-pfn", 0200, hwpoison_dir, NULL,
+ &hwpoison_fops);
- dentry = debugfs_create_file("unpoison-pfn", 0200, hwpoison_dir,
- NULL, &unpoison_fops);
- if (!dentry)
- goto fail;
+ debugfs_create_file("unpoison-pfn", 0200, hwpoison_dir, NULL,
+ &unpoison_fops);
- dentry = debugfs_create_u32("corrupt-filter-enable", 0600,
- hwpoison_dir, &hwpoison_filter_enable);
- if (!dentry)
- goto fail;
+ debugfs_create_u32("corrupt-filter-enable", 0600, hwpoison_dir,
+ &hwpoison_filter_enable);
- dentry = debugfs_create_u32("corrupt-filter-dev-major", 0600,
- hwpoison_dir, &hwpoison_filter_dev_major);
- if (!dentry)
- goto fail;
+ debugfs_create_u32("corrupt-filter-dev-major", 0600, hwpoison_dir,
+ &hwpoison_filter_dev_major);
- dentry = debugfs_create_u32("corrupt-filter-dev-minor", 0600,
- hwpoison_dir, &hwpoison_filter_dev_minor);
- if (!dentry)
- goto fail;
+ debugfs_create_u32("corrupt-filter-dev-minor", 0600, hwpoison_dir,
+ &hwpoison_filter_dev_minor);
- dentry = debugfs_create_u64("corrupt-filter-flags-mask", 0600,
- hwpoison_dir, &hwpoison_filter_flags_mask);
- if (!dentry)
- goto fail;
+ debugfs_create_u64("corrupt-filter-flags-mask", 0600, hwpoison_dir,
+ &hwpoison_filter_flags_mask);
- dentry = debugfs_create_u64("corrupt-filter-flags-value", 0600,
- hwpoison_dir, &hwpoison_filter_flags_value);
- if (!dentry)
- goto fail;
+ debugfs_create_u64("corrupt-filter-flags-value", 0600, hwpoison_dir,
+ &hwpoison_filter_flags_value);
#ifdef CONFIG_MEMCG
- dentry = debugfs_create_u64("corrupt-filter-memcg", 0600,
- hwpoison_dir, &hwpoison_filter_memcg);
- if (!dentry)
- goto fail;
+ debugfs_create_u64("corrupt-filter-memcg", 0600, hwpoison_dir,
+ &hwpoison_filter_memcg);
#endif
return 0;
-fail:
- pfn_inject_exit();
- return -ENOMEM;
}
module_init(pfn_inject_init);
--
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