67 lines
1.6 KiB
C
67 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <linux/fault-inject.h>
|
|
#include <linux/mm.h>
|
|
|
|
static struct {
|
|
struct fault_attr attr;
|
|
|
|
bool ignore_gfp_highmem;
|
|
bool ignore_gfp_reclaim;
|
|
u32 min_order;
|
|
} fail_page_alloc = {
|
|
.attr = FAULT_ATTR_INITIALIZER,
|
|
.ignore_gfp_reclaim = true,
|
|
.ignore_gfp_highmem = true,
|
|
.min_order = 1,
|
|
};
|
|
|
|
static int __init setup_fail_page_alloc(char *str)
|
|
{
|
|
return setup_fault_attr(&fail_page_alloc.attr, str);
|
|
}
|
|
__setup("fail_page_alloc=", setup_fail_page_alloc);
|
|
|
|
bool __should_fail_alloc_page(gfp_t gfp_mask, unsigned int order)
|
|
{
|
|
int flags = 0;
|
|
|
|
if (order < fail_page_alloc.min_order)
|
|
return false;
|
|
if (gfp_mask & __GFP_NOFAIL)
|
|
return false;
|
|
if (fail_page_alloc.ignore_gfp_highmem && (gfp_mask & __GFP_HIGHMEM))
|
|
return false;
|
|
if (fail_page_alloc.ignore_gfp_reclaim &&
|
|
(gfp_mask & __GFP_DIRECT_RECLAIM))
|
|
return false;
|
|
|
|
/* See comment in __should_failslab() */
|
|
if (gfp_mask & __GFP_NOWARN)
|
|
flags |= FAULT_NOWARN;
|
|
|
|
return should_fail_ex(&fail_page_alloc.attr, 1 << order, flags);
|
|
}
|
|
|
|
#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
|
|
|
|
static int __init fail_page_alloc_debugfs(void)
|
|
{
|
|
umode_t mode = S_IFREG | 0600;
|
|
struct dentry *dir;
|
|
|
|
dir = fault_create_debugfs_attr("fail_page_alloc", NULL,
|
|
&fail_page_alloc.attr);
|
|
|
|
debugfs_create_bool("ignore-gfp-wait", mode, dir,
|
|
&fail_page_alloc.ignore_gfp_reclaim);
|
|
debugfs_create_bool("ignore-gfp-highmem", mode, dir,
|
|
&fail_page_alloc.ignore_gfp_highmem);
|
|
debugfs_create_u32("min-order", mode, dir, &fail_page_alloc.min_order);
|
|
|
|
return 0;
|
|
}
|
|
|
|
late_initcall(fail_page_alloc_debugfs);
|
|
|
|
#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
|