d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

In pmap_clear_modify(), initialize pvh even for fictitious managed

Browse Source 
page, otherwise the small mappings loop would use uninitialized value.
Note that currently pmap_clear_modify() is not called for fictitious
pages.

Sponsored by:	The FreeBSD Foundation
Approved by:	re (glebius)
This commit is contained in:
Konstantin Belousov 2013-09-24 13:52:47 +00:00
parent 9606f568fe
commit 4cb8b041d1
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=255849
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
sys/amd64/amd64/pmap.c
View File

@ -5331,13 +5331,13 @@ pmap_clear_modify(vm_page_t m)
*/
if ((m->aflags & PGA_WRITEABLE) == 0)
return;
pvh = pa_to_pvh(VM_PAGE_TO_PHYS(m));
rw_rlock(&pvh_global_lock);
lock = VM_PAGE_TO_PV_LIST_LOCK(m);
rw_wlock(lock);
restart:
if ((m->flags & PG_FICTITIOUS) != 0)
goto small_mappings;
pvh = pa_to_pvh(VM_PAGE_TO_PHYS(m));
TAILQ_FOREACH_SAFE(pv, &pvh->pv_list, pv_next, next_pv) {
pmap = PV_PMAP(pv);
if (!PMAP_TRYLOCK(pmap)) {