git: 9d52823bf1df - main - vm_object: Widen the flags field

From: Mark Johnston <markj_at_FreeBSD.org>
Date: Sun, 06 Oct 2024 13:13:52 UTC
The branch main has been updated by markj:

URL: https://cgit.FreeBSD.org/src/commit/?id=9d52823bf1dfac237e58b5208299aaa5e2df42e9

commit 9d52823bf1dfac237e58b5208299aaa5e2df42e9
Author:     Mark Johnston <markj@FreeBSD.org>
AuthorDate: 2024-10-06 13:07:31 +0000
Commit:     Mark Johnston <markj@FreeBSD.org>
CommitDate: 2024-10-06 13:13:30 +0000

    vm_object: Widen the flags field
    
    Take advantage of a nearby 2-byte hole to avoid growing the struct.
    This way, only the offsets of "flags" and "pg_color" change.  Bump
    __FreeBSD_version since some out-of-tree kernel modules may access these
    fields, though I haven't found any examples so far.
    
    Reviewed by:    kib
    MFC after:      2 weeks
    Differential Revision:  https://reviews.freebsd.org/D35905
---
 sys/sys/param.h    | 2 +-
 sys/vm/vm_object.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/sys/sys/param.h b/sys/sys/param.h
index 3d772d551ffe..8af2f9594bc1 100644
--- a/sys/sys/param.h
+++ b/sys/sys/param.h
@@ -73,7 +73,7 @@
  * cannot include sys/param.h and should only be updated here.
  */
 #undef __FreeBSD_version
-#define __FreeBSD_version 1500024
+#define __FreeBSD_version 1500025
 
 /*
  * __FreeBSD_kernel__ indicates that this system uses the kernel of FreeBSD,
diff --git a/sys/vm/vm_object.h b/sys/vm/vm_object.h
index 9155d9cd6d6d..3274f59f958f 100644
--- a/sys/vm/vm_object.h
+++ b/sys/vm/vm_object.h
@@ -108,8 +108,8 @@ struct vm_object {
 	int shadow_count;		/* how many objects that this is a shadow for */
 	vm_memattr_t memattr;		/* default memory attribute for pages */
 	objtype_t type;			/* type of pager */
-	u_short flags;			/* see below */
 	u_short pg_color;		/* (c) color of first page in obj */
+	u_int flags;			/* see below */
 	blockcount_t paging_in_progress; /* (a) Paging (in or out) so don't collapse or destroy */
 	blockcount_t busy;		/* (a) object is busy, disallow page busy. */
 	int resident_page_count;	/* number of resident pages */