mirror of
https://github.com/torvalds/linux.git
synced 2024-11-10 14:11:52 +00:00
2f57ced636
Patch series "mm: add missing MODULE_DESCRIPTION() macros". This fixes the instances of "WARNING: modpost: missing MODULE_DESCRIPTION()" that I'm seeing in mm/. This patch (of 4): Fix the 'make W=1' warning: WARNING: modpost: missing MODULE_DESCRIPTION() in mm/hwpoison-inject.o Link: https://lkml.kernel.org/r/20240513-mm-md-v1-0-8c20e7d26842@quicinc.com Link: https://lkml.kernel.org/r/20240513-mm-md-v1-1-8c20e7d26842@quicinc.com Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com> Acked-by: Miaohe Lin <linmiaohe@huawei.com> Cc: Alexander Potapenko <glider@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Marco Elver <elver@google.com> Cc: Minchan Kim <minchan@kernel.org> Cc: Naoya Horiguchi <nao.horiguchi@gmail.com> Cc: Sergey Senozhatsky <senozhatsky@chromium.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
115 lines
2.8 KiB
C
115 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/* Inject a hwpoison memory failure on a arbitrary pfn */
|
|
#include <linux/module.h>
|
|
#include <linux/debugfs.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/swap.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/hugetlb.h>
|
|
#include "internal.h"
|
|
|
|
static struct dentry *hwpoison_dir;
|
|
|
|
static int hwpoison_inject(void *data, u64 val)
|
|
{
|
|
unsigned long pfn = val;
|
|
struct page *p;
|
|
struct folio *folio;
|
|
int err;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (!pfn_valid(pfn))
|
|
return -ENXIO;
|
|
|
|
p = pfn_to_page(pfn);
|
|
folio = page_folio(p);
|
|
|
|
if (!hwpoison_filter_enable)
|
|
goto inject;
|
|
|
|
shake_folio(folio);
|
|
/*
|
|
* This implies unable to support non-LRU pages except free page.
|
|
*/
|
|
if (!folio_test_lru(folio) && !folio_test_hugetlb(folio) &&
|
|
!is_free_buddy_page(p))
|
|
return 0;
|
|
|
|
/*
|
|
* 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(&folio->page);
|
|
if (err)
|
|
return 0;
|
|
|
|
inject:
|
|
pr_info("Injecting memory failure at pfn %#lx\n", pfn);
|
|
err = memory_failure(pfn, MF_SW_SIMULATED);
|
|
return (err == -EOPNOTSUPP) ? 0 : err;
|
|
}
|
|
|
|
static int hwpoison_unpoison(void *data, u64 val)
|
|
{
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
return unpoison_memory(val);
|
|
}
|
|
|
|
DEFINE_DEBUGFS_ATTRIBUTE(hwpoison_fops, NULL, hwpoison_inject, "%lli\n");
|
|
DEFINE_DEBUGFS_ATTRIBUTE(unpoison_fops, NULL, hwpoison_unpoison, "%lli\n");
|
|
|
|
static void __exit pfn_inject_exit(void)
|
|
{
|
|
hwpoison_filter_enable = 0;
|
|
debugfs_remove_recursive(hwpoison_dir);
|
|
}
|
|
|
|
static int __init pfn_inject_init(void)
|
|
{
|
|
hwpoison_dir = debugfs_create_dir("hwpoison", NULL);
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
debugfs_create_file("corrupt-pfn", 0200, hwpoison_dir, NULL,
|
|
&hwpoison_fops);
|
|
|
|
debugfs_create_file("unpoison-pfn", 0200, hwpoison_dir, NULL,
|
|
&unpoison_fops);
|
|
|
|
debugfs_create_u32("corrupt-filter-enable", 0600, hwpoison_dir,
|
|
&hwpoison_filter_enable);
|
|
|
|
debugfs_create_u32("corrupt-filter-dev-major", 0600, hwpoison_dir,
|
|
&hwpoison_filter_dev_major);
|
|
|
|
debugfs_create_u32("corrupt-filter-dev-minor", 0600, hwpoison_dir,
|
|
&hwpoison_filter_dev_minor);
|
|
|
|
debugfs_create_u64("corrupt-filter-flags-mask", 0600, hwpoison_dir,
|
|
&hwpoison_filter_flags_mask);
|
|
|
|
debugfs_create_u64("corrupt-filter-flags-value", 0600, hwpoison_dir,
|
|
&hwpoison_filter_flags_value);
|
|
|
|
#ifdef CONFIG_MEMCG
|
|
debugfs_create_u64("corrupt-filter-memcg", 0600, hwpoison_dir,
|
|
&hwpoison_filter_memcg);
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
module_init(pfn_inject_init);
|
|
module_exit(pfn_inject_exit);
|
|
MODULE_DESCRIPTION("HWPoison pages injector");
|
|
MODULE_LICENSE("GPL");
|