git: cab496e16cb3 - main - Make SHMMAXPGS an unsigned long

From: Andrew Turner <>
Date: Mon, 21 Mar 2022 10:33:46 UTC
The branch main has been updated by andrew:


commit cab496e16cb384de03010d9dea7399cbbfb3c3f9
Author:     Andrew Turner <>
AuthorDate: 2022-03-15 17:42:30 +0000
Commit:     Andrew Turner <>
CommitDate: 2022-03-21 10:27:35 +0000

    Make SHMMAXPGS an unsigned long
    This is used to calculate sizes that are then stored in unsigned long
    fields. Make this unsigned long so the calculations use this type and
    not an int that can lead to an integer overflow with a large PAGE_SIZE.
    This allows building this on arm64 with PAGE_SIZE of 16k. Further work
    will be needed if a 32-bit architecture tries to use a similar sized
    Sponsored by:   The FreeBSD Foundation
 sys/kern/sysv_shm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/kern/sysv_shm.c b/sys/kern/sysv_shm.c
index 7ba6c1187bc7..658b48e2e2e1 100644
--- a/sys/kern/sysv_shm.c
+++ b/sys/kern/sysv_shm.c
@@ -155,7 +155,7 @@ static void shm_prison_cleanup(struct prison *);
  * Tuneable values.
 #ifndef SHMMAXPGS
-#define	SHMMAXPGS	131072	/* Note: sysv shared memory is swap backed. */
+#define	SHMMAXPGS	131072ul /* Note: sysv shared memory is swap backed. */
 #ifndef SHMMAX