mirror/freebsd
1
0
Fork 0
mirror of https://git.FreeBSD.org/src.git synced 2024-12-16 10:20:30 +00:00
Code Issues Releases Activity

In case pmap_extract_and_hold() is ever performed on a different pmap than

Browse Source 
the current one, we need to pin the current thread to its CPU.

Submitted by:	tegge@
This commit is contained in:
Alan Cox 2004-06-26 19:10:12 +00:00
parent 247aba2474
commit df68e345c5
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=131150
1 changed files with 2 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
sys/i386/i386/pmap.c
View File

@ -878,12 +878,14 @@ pmap_extract_and_hold(pmap_t pmap, vm_offset_t va, vm_prot_t prot)
vm_page_hold(m);
}
} else {
sched_pin();
pte = *pmap_pte_quick(pmap, va);
if (pte != 0 &&
((pte & PG_RW) || (prot & VM_PROT_WRITE) == 0)) {
m = PHYS_TO_VM_PAGE(pte & PG_FRAME);
vm_page_hold(m);
}
sched_unpin();
}
}
vm_page_unlock_queues();