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author | Doug Moore <dougm@FreeBSD.org> | 2022-01-10 07:17:25 +0000 |
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committer | Doug Moore <dougm@FreeBSD.org> | 2022-01-10 07:17:25 +0000 |
commit | ae13829ddce0b5fbf12f2b240a26414b41def8ba (patch) | |
tree | ed8906f9cc16f2e7946718e41ac68913109574e3 | |
parent | 90bc1cf65778aafb1f226c8fe08218cfed5e40b2 (diff) | |
download | src-ae13829ddce0b5fbf12f2b240a26414b41def8ba.tar.gz src-ae13829ddce0b5fbf12f2b240a26414b41def8ba.zip |
vm_addr_ok: add power2 invariant check
With INVARIANTS defined, have vm_addr_align_ok and vm_addr_bound_ok
panic when passed an alignment/boundary parameter that is not a power
of two.
Reviewed by: alc
Suggested by: kib, se
Differential Revision: https://reviews.freebsd.org/D33725
-rw-r--r-- | sys/vm/vm_extern.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/sys/vm/vm_extern.h b/sys/vm/vm_extern.h index 4e03bba66eeb..9fac3403f787 100644 --- a/sys/vm/vm_extern.h +++ b/sys/vm/vm_extern.h @@ -140,6 +140,11 @@ u_int vm_wait_count(void); static inline bool vm_addr_align_ok(vm_paddr_t pa, u_long alignment) { +#ifdef INVARIANTS + if (!powerof2(alignment)) + panic("%s: alignment is not a power of 2: %#lx", + __func__, alignment); +#endif return ((pa & (alignment - 1)) == 0); } @@ -150,6 +155,11 @@ vm_addr_align_ok(vm_paddr_t pa, u_long alignment) static inline bool vm_addr_bound_ok(vm_paddr_t pa, vm_paddr_t size, vm_paddr_t boundary) { +#ifdef INVARIANTS + if (!powerof2(boundary)) + panic("%s: boundary is not a power of 2: %#jx", + __func__, (uintmax_t)boundary); +#endif return (((pa ^ (pa + size - 1)) & -boundary) == 0); } |