vm: Fix kstack alignment assertion

The expectation that the allocation will be aligned to the kstack size
only applies when allocating from a kstack arena, not when allocating a
non-standard size from the kernel arena.

MFC after:	1 week
Sponsored by:	Klara, Inc.
Sponsored by:	NetApp, Inc.
Fixes:		7a79d06697 ("vm: improve kstack_object pindex calculation to avoid pindex holes")
Reviewed by:	bnovkov, siderop1_netapp.com
Differential Revision:	https://reviews.freebsd.org/D54171

This commit is contained in:

Dag-Erling Smørgrav

2025-12-11 10:01:47 +01:00

parent e3fa0a22dd

commit a35545ee02

1 changed files with 6 additions and 4 deletions

									
										sys/vm/vm_glue.c
									
		+6
		-4
	
												View File
												
				@@ -321,10 +321,12 @@ vm_thread_alloc_kstack_kva(vm_size_t size, int domain)

					rv = vmem_alloc(arena, size, M_BESTFIT | M_NOWAIT, &addr);

					if (rv == ENOMEM)

						return (0);

					KASSERT(atop(addr - VM_MIN_KERNEL_ADDRESS) %

					    (kstack_pages + KSTACK_GUARD_PAGES) == 0,

					    ("%s: allocated kstack KVA not aligned to multiple of kstack size",

					    __func__));

					if (size == ptoa(kstack_pages + KSTACK_GUARD_PAGES)) {

						/* This expectation only applies to kstack arenas */

						KASSERT((addr - VM_MIN_KERNEL_ADDRESS) % size == 0,

						    ("%s: allocated kstack KVA not aligned to multiple of kstack size",

						    __func__));

					}

					return (addr);

				#else