git: 149e1af6ae49 - main - vm_kern: Use VM_ALLOC_NOFREE when allocating 'zero_region' page

[Bojan Novković]

The branch main has been updated by bnovkov:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=149e1af6ae4936fac0a907d4c62d745c179b4dc5

commit 149e1af6ae4936fac0a907d4c62d745c179b4dc5
Author:     Bojan Novković <bnov...@freebsd.org>
AuthorDate: 2024-10-05 15:05:40 +0000
Commit:     Bojan Novković <bnov...@freebsd.org>
CommitDate: 2024-10-05 15:05:40 +0000

     vm_kern: Use VM_ALLOC_NOFREE when allocating 'zero_region' page
    
     Allocate the 'zero_region' page using VM_ALLOC_NOFREE since
     it never gets released.
    
     Differential Revision:  https://reviews.freebsd.org/D46885
     Reviewed by:    alc, markj, kib
---
 sys/vm/vm_kern.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sys/vm/vm_kern.c b/sys/vm/vm_kern.c
index fb7c80b767ed..22776e2196b0 100644
--- a/sys/vm/vm_kern.c
+++ b/sys/vm/vm_kern.c
@@ -762,7 +762,8 @@ kmem_init_zero_region(void)
         * zeros, while not using much more physical resources.
         */
        addr = kva_alloc(ZERO_REGION_SIZE);
-       m = vm_page_alloc_noobj(VM_ALLOC_WIRED | VM_ALLOC_ZERO);
+       m = vm_page_alloc_noobj(VM_ALLOC_WIRED | VM_ALLOC_ZERO |
+           VM_ALLOC_NOFREE);
        for (i = 0; i < ZERO_REGION_SIZE; i += PAGE_SIZE)
                pmap_qenter(addr + i, &m, 1);
        pmap_protect(kernel_pmap, addr, addr + ZERO_REGION_SIZE, VM_PROT_READ);