git: adc33d3288e5 - main - vm_kern: in unback, init cursor while unlocked

The branch main has been updated by dougm:

URL: https://cgit.FreeBSD.org/src/commit/?id=adc33d3288e59f9f2f6ee5cffe49b0fd57ce0d70

commit adc33d3288e59f9f2f6ee5cffe49b0fd57ce0d70
Author:     Doug Moore <dougm@FreeBSD.org>
AuthorDate: 2025-04-15 16:42:06 +0000
Commit:     Doug Moore <dougm@FreeBSD.org>
CommitDate: 2025-04-15 16:42:06 +0000

    vm_kern: in unback, init cursor while unlocked
    
    In kmem_unback(), take one small bit of code out of the region where
    the write lock is held.
    
    Reviewed by:    kib
    Differential Revision:  https://reviews.freebsd.org/D49834
---
 sys/vm/vm_kern.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/vm/vm_kern.c b/sys/vm/vm_kern.c
index 2aa5588a7588..d13dfb1bc953 100644
--- a/sys/vm/vm_kern.c
+++ b/sys/vm/vm_kern.c
@@ -650,8 +650,8 @@ _kmem_unback(vm_object_t object, vm_offset_t addr, vm_size_t size)
 	pmap_remove(kernel_pmap, addr, addr + size);
 	offset = addr - VM_MIN_KERNEL_ADDRESS;
 	end = offset + size;
-	VM_OBJECT_WLOCK(object);
 	vm_page_iter_init(&pages, object);
+	VM_OBJECT_WLOCK(object);
 	m = vm_radix_iter_lookup(&pages, atop(offset)); 
 	domain = vm_page_domain(m);
 	if (__predict_true((m->oflags & VPO_KMEM_EXEC) == 0))