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git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
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Vlastimil Babka
53dabce265
This mostly reverts commit af3b854492 ("mm/page_alloc.c: allow error
injection"). The commit made should_fail_alloc_page() a noinline function
that's always called from the page allocation hotpath, even if it's empty
because CONFIG_FAIL_PAGE_ALLOC is not enabled, and there is no option to
disable it and prevent the associated function call overhead.
As with the preceding patch "mm, slab: put should_failslab back behind
CONFIG_SHOULD_FAILSLAB" and for the same reasons, put the
should_fail_alloc_page() back behind the config option. When enabled, the
ALLOW_ERROR_INJECTION and BTF_ID records are preserved so it's not a
complete revert.
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Vlastimil Babka <[email protected]>
Cc: Akinobu Mita <[email protected]>
Cc: Alexei Starovoitov <[email protected]>
Cc: Andrii Nakryiko <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: Daniel Borkmann <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Eduard Zingerman <[email protected]>
Cc: Hao Luo <[email protected]>
Cc: Hyeonggon Yoo <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: John Fastabend <[email protected]>
Cc: KP Singh <[email protected]>
Cc: Martin KaFai Lau <[email protected]>
Cc: Mateusz Guzik <[email protected]>
Cc: Roman Gushchin <[email protected]>
Cc: Song Liu <[email protected]>
Cc: Stanislav Fomichev <[email protected]>
Cc: Yonghong Song <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
113 lines
2.6 KiB
C
113 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_FAULT_INJECT_H
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#define _LINUX_FAULT_INJECT_H
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#ifdef CONFIG_FAULT_INJECTION
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#include <linux/types.h>
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#include <linux/debugfs.h>
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#include <linux/configfs.h>
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#include <linux/ratelimit.h>
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#include <linux/atomic.h>
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/*
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* For explanation of the elements of this struct, see
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* Documentation/fault-injection/fault-injection.rst
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*/
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struct fault_attr {
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unsigned long probability;
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unsigned long interval;
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atomic_t times;
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atomic_t space;
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unsigned long verbose;
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bool task_filter;
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unsigned long stacktrace_depth;
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unsigned long require_start;
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unsigned long require_end;
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unsigned long reject_start;
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unsigned long reject_end;
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unsigned long count;
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struct ratelimit_state ratelimit_state;
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struct dentry *dname;
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};
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enum fault_flags {
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FAULT_NOWARN = 1 << 0,
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};
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#define FAULT_ATTR_INITIALIZER { \
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.interval = 1, \
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.times = ATOMIC_INIT(1), \
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.require_end = ULONG_MAX, \
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.stacktrace_depth = 32, \
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.ratelimit_state = RATELIMIT_STATE_INIT_DISABLED, \
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.verbose = 2, \
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.dname = NULL, \
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}
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#define DECLARE_FAULT_ATTR(name) struct fault_attr name = FAULT_ATTR_INITIALIZER
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int setup_fault_attr(struct fault_attr *attr, char *str);
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bool should_fail_ex(struct fault_attr *attr, ssize_t size, int flags);
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bool should_fail(struct fault_attr *attr, ssize_t size);
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#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
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struct dentry *fault_create_debugfs_attr(const char *name,
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struct dentry *parent, struct fault_attr *attr);
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#else /* CONFIG_FAULT_INJECTION_DEBUG_FS */
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static inline struct dentry *fault_create_debugfs_attr(const char *name,
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struct dentry *parent, struct fault_attr *attr)
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{
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return ERR_PTR(-ENODEV);
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}
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#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
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#ifdef CONFIG_FAULT_INJECTION_CONFIGFS
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struct fault_config {
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struct fault_attr attr;
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struct config_group group;
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};
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void fault_config_init(struct fault_config *config, const char *name);
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#else /* CONFIG_FAULT_INJECTION_CONFIGFS */
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struct fault_config {
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};
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static inline void fault_config_init(struct fault_config *config,
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const char *name)
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{
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}
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#endif /* CONFIG_FAULT_INJECTION_CONFIGFS */
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#endif /* CONFIG_FAULT_INJECTION */
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struct kmem_cache;
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#ifdef CONFIG_FAIL_PAGE_ALLOC
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bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order);
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#else
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static inline bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order)
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{
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return false;
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}
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#endif /* CONFIG_FAIL_PAGE_ALLOC */
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#ifdef CONFIG_FAILSLAB
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int should_failslab(struct kmem_cache *s, gfp_t gfpflags);
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#else
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static inline int should_failslab(struct kmem_cache *s, gfp_t gfpflags)
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{
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return false;
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}
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#endif /* CONFIG_FAILSLAB */
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#endif /* _LINUX_FAULT_INJECT_H */
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