svn commit: r351494 - head/sys/amd64/amd64

[Konstantin Belousov]

Author: kib
Date: Sun Aug 25 20:57:39 2019
New Revision: 351494
URL: https://svnweb.freebsd.org/changeset/base/351494

Log:
  amd64: If domain-local page for pcpu cannot be allocated, keep use
  existing one.
  
  Allocation failure is possible for instance when cpu domain has no memory.
  
  Reported and tested by:	bcran
  Reviewed by:	markj
  Sponsored by:	The FreeBSD Foundation

Modified:
  head/sys/amd64/amd64/mp_machdep.c

Modified: head/sys/amd64/amd64/mp_machdep.c
==============================================================================
--- head/sys/amd64/amd64/mp_machdep.c	Sun Aug 25 20:36:52 2019	(r351493)
+++ head/sys/amd64/amd64/mp_machdep.c	Sun Aug 25 20:57:39 2019	(r351494)
@@ -402,6 +402,8 @@ mp_realloc_pcpu(int cpuid, int domain)
 		return;
 	m = vm_page_alloc_domain(NULL, 0, domain,
 	    VM_ALLOC_NORMAL | VM_ALLOC_NOOBJ);
+	if (m == NULL)
+		return;
 	na = PHYS_TO_DMAP(VM_PAGE_TO_PHYS(m));
 	pagecopy((void *)oa, (void *)na);
 	pmap_qenter((vm_offset_t)&__pcpu[cpuid], &m, 1);