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Commit cb83b42e authored by Tejun Heo's avatar Tejun Heo
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percpu: fix pcpu_chunk_struct_size 



Impact: fix short allocation leading to memory corruption

While dropping rvalue wrapping macros around global parameters,
pcpu_chunk_struct_size was set incorrectly resulting in shorter page
pointer array.  Fix it.

Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent cae3aeb8

mm/percpu.c

+1 −1
Original line number Diff line number Diff line
@@ -850,7 +850,7 @@ size_t __init pcpu_setup_static(pcpu_populate_pte_fn_t populate_pte_fn, 
	pcpu_chunk_size = num_possible_cpus() * pcpu_unit_size;

	pcpu_nr_slots = pcpu_size_to_slot(pcpu_unit_size) + 1;

	pcpu_chunk_struct_size = sizeof(struct pcpu_chunk)

		+ (1 << pcpu_unit_pages_shift) * sizeof(struct page *);

		+ num_possible_cpus() * pcpu_unit_pages * sizeof(struct page *);



	/* allocate chunk slots */

	pcpu_slot = alloc_bootmem(pcpu_nr_slots * sizeof(pcpu_slot[0]));