On Tue, Sep 06, 2022 at 06:19:23PM -0400, Phil Auld wrote:
On Tue, Sep 06, 2022 at 01:59:53PM -0700 Yury Norov wrote:
On Tue, Sep 06, 2022 at 04:35:42PM -0400, Phil Auld wrote:
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@gmail.com Signed-off-by: Phil Auld pauld@redhat.com Cc: Greg Kroah-Hartman gregkh@linuxfoundation.org Cc: "Rafael J. Wysocki" rafael@kernel.org Cc: Yury Norov yury.norov@gmail.com Cc: stable@vger.kernel.org Cc: feng xiangjun fengxj325@gmail.com
Applied on bitmap-for-next. Thanks!
Great, thanks!
This is hitting people already and causing problems, so I'll go add it to my tree as well to get it to Linus quicker. Here's one report of the problem: https://github.com/util-linux/util-linux/issues/1810
thanks,
greg k-h