target/linux/generic/pending-5.10/110-perf-jevents-fix-getting-maximum-number-of-fds.patch

   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Tue, 25 May 2021 18:00:34 +0200
   3 Subject: [PATCH] perf jevents: fix getting maximum number of fds
   4
   5 On some hosts, rlim.rlim_max can be returned as RLIM_INFINITY.
   6 By casting it to int, it is interpreted as -1, which will cause get_maxfds
   7 to return 0, causing "Invalid argument" errors in nftw() calls.
   8 Fix this by casting the second argument of min() to rlim_t instead.
   9
  10 Fixes: 80eeb67fe577 ("perf jevents: Program to convert JSON file")
  11 Signed-off-by: Felix Fietkau <nbd@nbd.name>
  12 ---
  13
  14 --- a/tools/perf/pmu-events/jevents.c
  15 +++ b/tools/perf/pmu-events/jevents.c
  16 @@ -894,7 +894,7 @@ static int get_maxfds(void)
  17         struct rlimit rlim;
  18
  19         if (getrlimit(RLIMIT_NOFILE, &rlim) == 0)
  20 -               return min((int)rlim.rlim_max / 2, 512);
  21 +               return min(rlim.rlim_max / 2, (rlim_t)512);
  22
  23         return 512;
  24  }