af3b854492
Model call chain after should_failslab(). Likewise, we can now use a kprobe to override the return value of should_fail_alloc_page() and inject allocation failures into alloc_page*(). This will allow injecting allocation failures using the BCC tools even without building kernel with CONFIG_FAIL_PAGE_ALLOC and booting it with a fail_page_alloc= parameter, which incurs some overhead even when failures are not being injected. On the other hand, this patch adds an unconditional call to should_fail_alloc_page() from page allocation hotpath. That overhead should be rather negligible with CONFIG_FAIL_PAGE_ALLOC=n when there's no kprobe attached, though. [vbabka@suse.cz: changelog addition] Link: http://lkml.kernel.org/r/20181214074330.18917-1-bpoirier@suse.com Signed-off-by: Benjamin Poirier <bpoirier@suse.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Michal Hocko <mhocko@suse.com> Cc: Pavel Tatashin <pavel.tatashin@microsoft.com> Cc: Oscar Salvador <osalvador@suse.de> Cc: Mike Rapoport <rppt@linux.vnet.ibm.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Alexander Duyck <alexander.h.duyck@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
37 lines
1 KiB
C
37 lines
1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_GENERIC_ERROR_INJECTION_H
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#define _ASM_GENERIC_ERROR_INJECTION_H
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#if defined(__KERNEL__) && !defined(__ASSEMBLY__)
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enum {
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EI_ETYPE_NONE, /* Dummy value for undefined case */
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EI_ETYPE_NULL, /* Return NULL if failure */
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EI_ETYPE_ERRNO, /* Return -ERRNO if failure */
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EI_ETYPE_ERRNO_NULL, /* Return -ERRNO or NULL if failure */
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EI_ETYPE_TRUE, /* Return true if failure */
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};
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struct error_injection_entry {
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unsigned long addr;
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int etype;
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};
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#ifdef CONFIG_FUNCTION_ERROR_INJECTION
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/*
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* Whitelist ganerating macro. Specify functions which can be
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* error-injectable using this macro.
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*/
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#define ALLOW_ERROR_INJECTION(fname, _etype) \
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static struct error_injection_entry __used \
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__attribute__((__section__("_error_injection_whitelist"))) \
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_eil_addr_##fname = { \
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.addr = (unsigned long)fname, \
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.etype = EI_ETYPE_##_etype, \
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};
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#else
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#define ALLOW_ERROR_INJECTION(fname, _etype)
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#endif
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#endif
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#endif /* _ASM_GENERIC_ERROR_INJECTION_H */
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