Instead of dividing by 8 and then performing log2 by hand, use a more
readable calculation.
The behavior of rounddown_pow_of_two() for an input of 0 is undefined,
so handle that case and small values manually to achieve the same
results.
Signed-off-by: Christian Göttsche <cgzones@xxxxxxxxxxxxxx>
---
security/selinux/ss/avtab.c | 8 +-------
1 file changed, 1 insertion(+), 7 deletions(-)
diff --git a/security/selinux/ss/avtab.c b/security/selinux/ss/avtab.c
index 955cfe495606..1d1ffe085b35 100644
--- a/security/selinux/ss/avtab.c
+++ b/security/selinux/ss/avtab.c
@@ -298,13 +298,7 @@ int avtab_alloc(struct avtab *h, u32 nrules)
u32 nslot = 0;
if (nrules != 0) {
- u32 shift = 1;
- u32 work = nrules >> 3;
- while (work) {
- work >>= 1;
- shift++;
- }
- nslot = 1 << shift;
+ nslot = nrules > 3 ? rounddown_pow_of_two(nrules / 2) : 2;
if (nslot > MAX_AVTAB_HASH_BUCKETS)
nslot = MAX_AVTAB_HASH_BUCKETS;
--
2.40.1
