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https://github.com/torvalds/linux
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ff93bca769
Previously, alloc_ila_locks() and bucket_table_alloc() call spin_lock_init() separately, therefore they have two different lock names and lock class keys. However, after commitb893281715("ila: Call library function alloc_bucket_locks") they both call helper alloc_bucket_spinlocks() which now only has one lock name and lock class key. This causes a few bogus lockdep warnings as reported by syzbot. Fix this by making alloc_bucket_locks() a macro and pass declaration name as lock name and a static lock class key inside the macro. Fixes:b893281715("ila: Call library function alloc_bucket_locks") Reported-by: <syzbot+b66a5a554991a8ed027c@syzkaller.appspotmail.com> Cc: Tom Herbert <tom@quantonium.net> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
#include <linux/export.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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/* Allocate an array of spinlocks to be accessed by a hash. Two arguments
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* indicate the number of elements to allocate in the array. max_size
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* gives the maximum number of elements to allocate. cpu_mult gives
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* the number of locks per CPU to allocate. The size is rounded up
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* to a power of 2 to be suitable as a hash table.
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*/
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int __alloc_bucket_spinlocks(spinlock_t **locks, unsigned int *locks_mask,
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size_t max_size, unsigned int cpu_mult, gfp_t gfp,
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const char *name, struct lock_class_key *key)
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{
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spinlock_t *tlocks = NULL;
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unsigned int i, size;
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#if defined(CONFIG_PROVE_LOCKING)
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unsigned int nr_pcpus = 2;
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#else
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unsigned int nr_pcpus = num_possible_cpus();
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#endif
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if (cpu_mult) {
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nr_pcpus = min_t(unsigned int, nr_pcpus, 64UL);
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size = min_t(unsigned int, nr_pcpus * cpu_mult, max_size);
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} else {
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size = max_size;
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}
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if (sizeof(spinlock_t) != 0) {
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tlocks = kvmalloc_array(size, sizeof(spinlock_t), gfp);
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if (!tlocks)
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return -ENOMEM;
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for (i = 0; i < size; i++) {
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spin_lock_init(&tlocks[i]);
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lockdep_init_map(&tlocks[i].dep_map, name, key, 0);
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}
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}
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*locks = tlocks;
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*locks_mask = size - 1;
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return 0;
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}
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EXPORT_SYMBOL(__alloc_bucket_spinlocks);
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void free_bucket_spinlocks(spinlock_t *locks)
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{
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kvfree(locks);
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}
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EXPORT_SYMBOL(free_bucket_spinlocks);
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