Date: Mon, 10 Jan 2022 07:22:09 GMT From: Doug Moore <dougm@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: ae13829ddce0 - main - vm_addr_ok: add power2 invariant check Message-ID: <202201100722.20A7M9DM003194@gitrepo.freebsd.org>
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The branch main has been updated by dougm: URL: https://cgit.FreeBSD.org/src/commit/?id=ae13829ddce0b5fbf12f2b240a26414b41def8ba commit ae13829ddce0b5fbf12f2b240a26414b41def8ba Author: Doug Moore <dougm@FreeBSD.org> AuthorDate: 2022-01-10 07:17:25 +0000 Commit: Doug Moore <dougm@FreeBSD.org> CommitDate: 2022-01-10 07:17:25 +0000 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 --- sys/vm/vm_extern.h | 10 ++++++++++ 1 file changed, 10 insertions(+) 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); }
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