D58942.id184303.diff
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	diff --git a/lib/libsys/stat.2 b/lib/libsys/stat.2
	--- a/lib/libsys/stat.2
	+++ b/lib/libsys/stat.2
	@@ -271,10 +271,14 @@
	.Pp
	For file descriptors referencing specific non-file objects,
	the field is type-specific.
	+.Pp
	For POSIX shared memory segments
	.Pq see Xr shm_open 2 ,
	-the block size is equal to
	-the platform page size
	+the block size is 512 bytes.
	+For older versions of
	+.Fx
	+.Pq before 15.2 and 16.0
	+the block size was equal to the platform page size
	.Pq Xr getpagesize 2 .
	.El
	.Pp
	diff --git a/sys/kern/uipc_shm.c b/sys/kern/uipc_shm.c
	--- a/sys/kern/uipc_shm.c
	+++ b/sys/kern/uipc_shm.c
	@@ -658,12 +658,8 @@
	sb->st_dev = shm_dev_ino;
	sb->st_ino = shmfd->shm_ino;
	sb->st_nlink = shmfd->shm_object->ref_count;
	- if (shm_largepage(shmfd)) {
	- sb->st_blocks = shmfd->shm_object->size /
	- (pagesizes[shmfd->shm_lp_psind] >> PAGE_SHIFT);
	- } else {
	- sb->st_blocks = shmfd->shm_pages;
	- }
	+ sb->st_blocks = ptoa(shm_largepage(shmfd) ? shmfd->shm_object->size :
	+ shmfd->shm_pages) / DEV_BSIZE;

	return (0);
	}