Fix an issue with the dynamic pcpu/vnet data allocators.

We cannot expect that modspace is the last entry in the linker
set and thus that modspace + possible extra space up to PAGE_SIZE
would be contiguous.  For the moment do not support more than
*_MODMIN space and ignore the extra space (*).

(*) We know how to get it back but it'll need testing.

Discussed with:	jeff, rwatson (briefly)
Reviewed by:	jeff
Sponsored by:	The FreeBSD Foundation
Sponsored by:	CK Software GmbH
MFC after:	4 days

1 files changed, 1 insertions, 1 deletions

diff --git a/sys/kern/subr_pcpu.c b/sys/kern/subr_pcpu.c
index f28ad61..c63a971 100644
--- a/sys/kern/subr_pcpu.c
+++ b/sys/kern/subr_pcpu.c
@@ -125,7 +125,7 @@ dpcpu_startup(void *dummy __unused)
 
 	df = malloc(sizeof(*df), M_PCPU, M_WAITOK | M_ZERO);
 	df->df_start = (uintptr_t)&DPCPU_NAME(modspace);
-	df->df_len = DPCPU_MODSIZE;
+	df->df_len = DPCPU_MODMIN;
 	TAILQ_INSERT_HEAD(&dpcpu_head, df, df_link);
 	sx_init(&dpcpu_lock, "dpcpu alloc lock");
 }