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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970// SPDX-License-Identifier: GPL-2.0#include <linux/fault-inject.h>#include <linux/debugfs.h>#include <linux/error-injection.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);}ALLOW_ERROR_INJECTION(should_fail_alloc_page, TRUE);
#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 */