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Daniel Wagner
b6139a6abf
group_cpu_evenly() might have allocated less groups then requested:
group_cpu_evenly()
__group_cpus_evenly()
alloc_nodes_groups()
# allocated total groups may be less than numgrps when
# active total CPU number is less then numgrps
In this case, the caller will do an out of bound access because the
caller assumes the masks returned has numgrps.
Return the number of groups created so the caller can limit the access
range accordingly.
Acked-by: Thomas Gleixner <[email protected]>
Reviewed-by: Hannes Reinecke <[email protected]>
Reviewed-by: Ming Lei <[email protected]>
Signed-off-by: Daniel Wagner <[email protected]>
Reviewed-by: Chaitanya Kulkarni <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>
15 lines
334 B
C
15 lines
334 B
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2016 Thomas Gleixner.
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* Copyright (C) 2016-2017 Christoph Hellwig.
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*/
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#ifndef __LINUX_GROUP_CPUS_H
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#define __LINUX_GROUP_CPUS_H
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#include <linux/kernel.h>
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#include <linux/cpu.h>
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struct cpumask *group_cpus_evenly(unsigned int numgrps, unsigned int *nummasks);
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#endif
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