As PAGE_SIZE is unsigned long, -1 > PAGE_SIZE when NR_CPUS <= 3.
This leads to very large file sizes:
topology$ ls -l
total 0
-r--r--r-- 1 root root 18446744073709551615 Sep 5 11:59 core_cpus
-r--r--r-- 1 root root 4096 Sep 5 11:59 core_cpus_list
-r--r--r-- 1 root root 4096 Sep 5 10:58 core_id
-r--r--r-- 1 root root 18446744073709551615 Sep 5 10:10 core_siblings
-r--r--r-- 1 root root 4096 Sep 5 11:59 core_siblings_list
-r--r--r-- 1 root root 18446744073709551615 Sep 5 11:59 die_cpus
-r--r--r-- 1 root root 4096 Sep 5 11:59 die_cpus_list
-r--r--r-- 1 root root 4096 Sep 5 11:59 die_id
-r--r--r-- 1 root root 18446744073709551615 Sep 5 11:59 package_cpus
-r--r--r-- 1 root root 4096 Sep 5 11:59 package_cpus_list
-r--r--r-- 1 root root 4096 Sep 5 10:58 physical_package_id
-r--r--r-- 1 root root 18446744073709551615 Sep 5 10:10 thread_siblings
-r--r--r-- 1 root root 4096 Sep 5 11:59 thread_siblings_list
Adjust the inequality to catch the case when NR_CPUS is configured
to a small value.
Fixes: 7ee951acd31a ("drivers/base: fix userspace break from using bin_attributes for cpumap and cpulist")
Reported-by: feng xiangjun <fengxj325@xxxxxxxxx>
Signed-off-by: Phil Auld <pauld@xxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: "Rafael J. Wysocki" <rafael@xxxxxxxxxx>
Cc: Yury Norov <yury.norov@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Cc: feng xiangjun <fengxj325@xxxxxxxxx>
---
include/linux/cpumask.h | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index bd047864c7ac..7b1349612d6d 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -1127,9 +1127,10 @@ cpumap_print_list_to_buf(char *buf, const struct cpumask *mask,
* cover a worst-case of every other cpu being on one of two nodes for a
* very large NR_CPUS.
*
- * Use PAGE_SIZE as a minimum for smaller configurations.
+ * Use PAGE_SIZE as a minimum for smaller configurations while avoiding
+ * unsigned comparison to -1.
*/
-#define CPUMAP_FILE_MAX_BYTES ((((NR_CPUS * 9)/32 - 1) > PAGE_SIZE) \
+#define CPUMAP_FILE_MAX_BYTES ((((NR_CPUS * 9)/32) > PAGE_SIZE + 1) \
? (NR_CPUS * 9)/32 - 1 : PAGE_SIZE)
#define CPULIST_FILE_MAX_BYTES (((NR_CPUS * 7)/2 > PAGE_SIZE) ? (NR_CPUS * 7)/2 : PAGE_SIZE)
--
2.31.1
