Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[sfrench/cifs-2.6.git] / include / asm-generic / error-injection.h
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_GENERIC_ERROR_INJECTION_H
3 #define _ASM_GENERIC_ERROR_INJECTION_H
4
5 #if defined(__KERNEL__) && !defined(__ASSEMBLY__)
6 enum {
7         EI_ETYPE_NONE,          /* Dummy value for undefined case */
8         EI_ETYPE_NULL,          /* Return NULL if failure */
9         EI_ETYPE_ERRNO,         /* Return -ERRNO if failure */
10         EI_ETYPE_ERRNO_NULL,    /* Return -ERRNO or NULL if failure */
11         EI_ETYPE_TRUE,          /* Return true if failure */
12 };
13
14 struct error_injection_entry {
15         unsigned long   addr;
16         int             etype;
17 };
18
19 struct pt_regs;
20
21 #ifdef CONFIG_FUNCTION_ERROR_INJECTION
22 /*
23  * Whitelist ganerating macro. Specify functions which can be
24  * error-injectable using this macro.
25  */
26 #define ALLOW_ERROR_INJECTION(fname, _etype)                            \
27 static struct error_injection_entry __used                              \
28         __attribute__((__section__("_error_injection_whitelist")))      \
29         _eil_addr_##fname = {                                           \
30                 .addr = (unsigned long)fname,                           \
31                 .etype = EI_ETYPE_##_etype,                             \
32         };
33
34 void override_function_with_return(struct pt_regs *regs);
35 #else
36 #define ALLOW_ERROR_INJECTION(fname, _etype)
37
38 static inline void override_function_with_return(struct pt_regs *regs) { }
39 #endif
40 #endif
41
42 #endif /* _ASM_GENERIC_ERROR_INJECTION_H */