When page sizes become very large they may overflow a long as we
convert them from giga-, mega-, or kilo-bytes to bytes. When doing the
conversion if we hit an error we return LONG_MAX. On 32bit this is 2GB
is is potentially a sensible page size for a 32bit application. As page
size is a long we have all of the negative range available so it seems
logical to use a negative value to indicate error.
Signed-off-by: Andy Whitcroft <[EMAIL PROTECTED]>
Acked-by: Adam Litke <[EMAIL PROTECTED]>
Acked-by: Mel Gorman <[EMAIL PROTECTED]>
---
hugeutils.c | 10 ++++------
1 files changed, 4 insertions(+), 6 deletions(-)
diff --git a/hugeutils.c b/hugeutils.c
index ae97902..726899e 100644
--- a/hugeutils.c
+++ b/hugeutils.c
@@ -69,8 +69,8 @@ static int hpage_sizes_default_idx = -1;
*/
static inline long size_to_smaller_unit(long size)
{
- if (size == LONG_MAX || size * 1024 < size)
- return LONG_MAX;
+ if (size < 0 || size * 1024 < size)
+ return -1;
else
return size * 1024;
}
@@ -111,11 +111,9 @@ long __lh_parse_page_size(const char *str)
size = size_to_smaller_unit(size);
}
- if (size == LONG_MAX) {
+ if (size < 0)
errno = EOVERFLOW;
- return -1;
- } else
- return size;
+ return size;
}
struct hugetlb_pool_counter_info_t {
--
1.6.0.1.451.gc8d31
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