[PATCH v3 0/4] sys_info: prevent duplicate backtraces

[Bradley Morgan <include@grrlz.net>]

Some callers handle SYS_INFO_ALL_BT themselves before calling sys_info().
When they strip that bit, an all_bt-only mask becomes zero and sys_info(0)
falls back to kernel_si_mask, potentially duplicating output.

This series adds sys_info_with_filter() to filter specific bits without
triggering the kernel_si_mask fallback.

Changes since v2:
- Use sys_info_with_filter() instead of sys_info_without_all_bt() per
  Petr's suggestion
- Filter applied at __sys_info() level to handle kernel_si_mask correctly
- Added panic.c conversion

Bradley Morgan (4):
  sys_info: add helper for callers that print some sys_info on their own
  watchdog: use sys_info_with_filter() to avoid duplicate backtraces
  powerpc/watchdog: use sys_info_with_filter() to avoid duplicate
    backtraces
  panic: use sys_info_with_filter() to avoid duplicate backtraces

 arch/powerpc/kernel/watchdog.c | 12 ++++++++----
 include/linux/sys_info.h       |  1 +
 kernel/panic.c                 |  2 +-
 kernel/watchdog.c              | 12 ++++++++----
 lib/sys_info.c                 | 20 ++++++++++++++++++--
 5 files changed, 36 insertions(+), 11 deletions(-)

-- 
2.53.0