Re: [PATCH] selftests: cgroup: fix test_zswap error path and meaningless check

On Tue, 12 Sep 2023 10:38:00 +0200 Domenico Cerasuolo cerasuolodomenico@gmail.com wrote:

Replace destruction paths with simple returns before the test cgroup is created, there is nothing to free or destroy at that point.

Remove pointless check, stored_pages is a size_t and cannot be < 0.

...

@@ -208,8 +208,6 @@ static int test_no_kmem_bypass(const char *root) free(trigger_allocation); if (get_zswap_stored_pages(&stored_pages)) break;

• if (stored_pages < 0)
  

• 	break;
  

  /* If memory was pushed to zswap, verify it belongs to memcg */ if (stored_pages > stored_pages_threshold) { int zswapped = cg_read_key_long(test_group, "memory.stat", "zswapped ");

stored_pages will be set to -1 on error. It would be better to cast stored_pages to ssize_t in the check, rather than simply ignoring errors?