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When testing, we want a random but yet reproducible order in which to process elements. Here we create an array which is a random (using the Tausworthe PRNG) permutation of the order in which to execute. Note these are simple helpers intended to be merged upstream in lib/ v2: Tidier code by David Herrmann v3: Add reminder that this code is intended to be temporary, with at least the bulk of the prandom changes going to lib/ Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: David Herrmann <dh.herrmann@gmail.com> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20161222083641.2691-6-chris@chris-wilson.co.uk
26 lines
680 B
C
26 lines
680 B
C
#ifndef __DRM_RANDOM_H__
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#define __DRM_RANDOM_H__
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/* This is a temporary home for a couple of utility functions that should
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* be transposed to lib/ at the earliest convenience.
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*/
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#include <linux/random.h>
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#define DRM_RND_STATE_INITIALIZER(seed__) ({ \
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struct rnd_state state__; \
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prandom_seed_state(&state__, (seed__)); \
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state__; \
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})
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#define DRM_RND_STATE(name__, seed__) \
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struct rnd_state name__ = DRM_RND_STATE_INITIALIZER(seed__)
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unsigned int *drm_random_order(unsigned int count,
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struct rnd_state *state);
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void drm_random_reorder(unsigned int *order,
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unsigned int count,
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struct rnd_state *state);
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#endif /* !__DRM_RANDOM_H__ */
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