UPSTREAM: lib/stackdepot: export save/fetch stack for drivers
Some drivers would like to record stacktraces in order to aide leak tracing. As stackdepot already provides a facility for only storing the unique traces, thereby reducing the memory required, export that functionality for use by drivers. The code was originally created for KASAN and moved under lib in commit cd11016e5f521 ("mm, kasan: stackdepot implementation. Enable stackdepot for SLAB") so that it could be shared with mm/. In turn, we want to share it now with drivers. Link: http://lkml.kernel.org/r/20161108133209.22704-1-chris@chris-wilson.co.uk Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Alexander Potapenko <glider@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: "Kirill A. Shutemov" <kirill@shutemov.name> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Bug: 64145065 (cherry-picked from ae65a21fb851f09bf6341761d884fb86b644b75a) Change-Id: I3bf7ab5c6526c1ac895ac98d2d37cc26ea05bbde Signed-off-by: Paul Lawrence <paullawrence@google.com>
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@ -192,6 +192,7 @@ void depot_fetch_stack(depot_stack_handle_t handle, struct stack_trace *trace)
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trace->entries = stack->entries;
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trace->skip = 0;
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}
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EXPORT_SYMBOL_GPL(depot_fetch_stack);
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/**
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* depot_save_stack - save stack in a stack depot.
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@ -283,3 +284,4 @@ exit:
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fast_exit:
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return retval;
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}
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EXPORT_SYMBOL_GPL(depot_save_stack);
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