[PATCH 6.1.y v2 00/18] Backport fixes for -Wdiscarded-qualifiers and -Wnonnull with newer glibc

[Shreenidhi Shedi <yesshedi@gmail.com>]

Hi all,

This patch series backports a number of patches from master to 6.1.y
to fix `-Wdiscarded-qualifiers` and `-Wnonnull` build issues with
newer glibc versions.

I will port these changes to other stable trees once this gets reviewed.

Arnaldo Carvalho de Melo (12):
  perf diff: Constify strchr() return variables
  perf test bpf: Address error about non-null argument for epoll_pwait
    2nd arg
  perf trace: Deal with compiler const checks
  perf tools: Use const for variables receiving str{str,r?chr}() returns
  perf strlist: Don't write to const memory
  perf metricgroup: Constify variables storing the result of strchr() on
    const tables
  perf session: Don't write to memory pointed to a const pointer
  perf trace-event: Constify variables storing the result of strchr() on
    const tables
  perf units: Constify variables storing the result of strchr() on const
    tables
  perf time-utils: Constify variables storing the result of strchr() on
    const tables
  perf demangle-java: Constify variables storing the result of strchr()
    on const tables
  perf bpf-event: Constify variables storing the result of strchr() on
    const tables

Dr. David Alan Gilbert (1):
  perf tools: Remove unused color_fwrite_lines

Mikhail Gavrilov (1):
  libbpf: Fix -Wdiscarded-qualifiers under C23

The following patches by me are branch specific. Upstream code is
refactored and the troubling piece of code is not there anymore.

Shreenidhi Shedi (4):
  perf list: Fix -Wdiscarded-qualifiers under C23
  perf parse-events: Fix -Wdiscarded-qualifiers under C23
  perf bpf: Fix -Wdiscarded-qualifiers under C23
  perf parse-events:: Fix -Wdiscarded-qualifiers under C23

 tools/lib/bpf/libbpf.c             |  2 +-
 tools/perf/builtin-diff.c          | 12 +++++-------
 tools/perf/builtin-list.c          |  3 ++-
 tools/perf/builtin-trace.c         |  2 +-
 tools/perf/jvmti/libjvmti.c        |  2 +-
 tools/perf/tests/bpf.c             |  3 ++-
 tools/perf/util/bpf-event.c        |  3 ++-
 tools/perf/util/bpf-loader.c       |  2 +-
 tools/perf/util/color.c            | 28 ----------------------------
 tools/perf/util/color.h            |  1 -
 tools/perf/util/demangle-java.c    |  2 +-
 tools/perf/util/evlist.c           |  3 ++-
 tools/perf/util/metricgroup.c      |  3 +--
 tools/perf/util/parse-events.c     |  2 +-
 tools/perf/util/print-events.c     |  4 ++--
 tools/perf/util/session.c          |  6 +++---
 tools/perf/util/strlist.c          | 12 ++++++++----
 tools/perf/util/time-utils.c       |  4 ++--
 tools/perf/util/trace-event-info.c |  2 +-
 tools/perf/util/units.c            |  2 +-
 20 files changed, 37 insertions(+), 61 deletions(-)

v1:
https://lore.kernel.org/all/20260509173559.10999-1-yesshedi@gmail.com/

v2:
Address comment from Greg
https://lore.kernel.org/all/2026051001-jacket-reliance-3ec6@gregkh/

-- 
2.54.0