litmus-rt.git - The LITMUS^RT kernel.

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The LITMUS^RT kernel.

Bjoern Brandenburg

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: support hwpoison injection for hugepage' href='/cgit/cgit.cgi/litmus-rt-tegra.git/commit/mm/hwpoison-inject.c?id=43131e141abdb44c487cf79af3ef1fe5164dcef9'>43131e141ab

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/* 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 page *hpage;
	int err;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	if (!hwpoison_filter_enable)
		goto inject;
	if (!pfn_valid(pfn))
		return -ENXIO;

	p = pfn_to_page(pfn);
	hpage = compound_head(p);
	/*
	 * This implies unable to support free buddy pages.
	 */
	if (!get_page_unless_zero(hpage))
		return 0;

	if (!PageLRU(p) && !PageHuge(p))
		shake_page(p, 0);
	/*
	 * This implies unable to support non-LRU pages.
	 */
	if (!PageLRU(p) && !PageHuge(p))
		return 0;

	/*


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