Author: alc
Date: Sat Apr 11 22:57:13 2015
New Revision: 281444
URL: https://svnweb.freebsd.org/changeset/base/281444
Log:
Correct an off-by-one error in vm_reserv_reclaim_contig() that results in
an infinite loop.
Submitted by: Svatopluk Kraus
MFC after: 1 week
Modified:
head/sys/vm/vm_reserv.c
Modified: head/sys/vm/vm_reserv.c
==============================================================================
--- head/sys/vm/vm_reserv.c Sat Apr 11 20:44:21 2015 (r281443)
+++ head/sys/vm/vm_reserv.c Sat Apr 11 22:57:13 2015 (r281444)
@@ -983,8 +983,18 @@ vm_reserv_reclaim_contig(u_long npages,
break;
} else if ((pa & (alignment - 1)) != 0 ||
((pa ^ (pa + size - 1)) & ~(boundary - 1)) != 0) {
- /* Continue with this reservation. */
- hi = lo;
+ /*
+ * The current page doesn't meet the alignment
+ * and/or boundary requirements. Continue
+ * searching this reservation until the rest
+ * of its free pages are either excluded or
+ * exhausted.
+ */
+ hi = lo + 1;
+ if (hi >= NBPOPMAP) {
+ hi = 0;
+ i++;
+ }
continue;
}
/* Find the next used page. */
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