diff options
Diffstat (limited to 'usr/src')
| -rw-r--r-- | usr/src/cmd/mdb/common/modules/genunix/kgrep.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/usr/src/cmd/mdb/common/modules/genunix/kgrep.c b/usr/src/cmd/mdb/common/modules/genunix/kgrep.c index c0eab1aec1..7052827562 100644 --- a/usr/src/cmd/mdb/common/modules/genunix/kgrep.c +++ b/usr/src/cmd/mdb/common/modules/genunix/kgrep.c @@ -23,7 +23,9 @@ * Use is subject to license terms. */ -#pragma ident "%Z%%M% %I% %E% SMI" +/* + * Copyright 2011 Joyent, Inc. All rights reserved. + */ /* * Generic memory walker, used by both the genunix and libumem dmods. @@ -154,8 +156,14 @@ kgrep_range_fancybits(uintptr_t base, uintptr_t lim, void *kg_arg) \ for (pos = page; pos < page_end; pos++) { \ cur = *pos; \ \ + /* \ + * Due to C's (surprising) integral promotion \ + * rules for unsigned types smaller than an \ + * int, we need to explicitly cast the result \ + * of cur minus pattern, below. \ + */ \ if (((cur ^ pattern) & mask) != 0 && \ - (cur - pattern) >= dist) \ + (uintbits_t)(cur - pattern) >= dist) \ continue; \ \ out = cur; \ |