[PATCH v2 0/9] seq_buf: Add seq_buf_strlen()

[Kees Cook <kees@kernel.org>]

Hi,

While working on seq_buf conversions, we found there was a need for
seq_buf_strlen() (since calling strlen(seq_buf_str()) would be a waste of
time: seq_buf already knows the length), and seq_buf_init_append() (to
start a seq_buf from an existing string buffer). And while implementing
that, we found a bunch of other related things that needed fixing. This
is that series, with tests for each fix.

 v1: https://lore.kernel.org/all/20260917002312.i.923-kees@kernel.org/
 v2:
 - seq_buf_do_printk() simplification and more tests
 - add seq_buf_init_append() and tests[1]
 - finish documenting seq_buf[1] and link it to kernel api docs
 - test improvements throughout

-Kees

[1] https://lore.kernel.org/all/20260917011359.1585961-1-morbo@google.com/


Bill Wendling (1):
  seq_buf: Add seq_buf_init_append()

Kees Cook (8):
  seq_buf: Do not print an empty line from an overflowed
    seq_buf_do_printk()
  seq_buf: Do not pop from an overflowed seq_buf
  seq_buf: Copy what fits when seq_buf_puts() and seq_buf_putmem()
    overflow
  seq_buf: Clear what a writer did not claim when a seq_buf overflows
  seq_buf: Add seq_buf_strlen()
  powerpc/papr_scm: Return the string length from the sysfs show
    functions
  nvdimm: ndtest: Return the string length from flags_show()
  docs: core-api: Document the seq_buf API

 Documentation/core-api/kernel-api.rst     |   9 +
 include/linux/seq_buf.h                   | 103 ++++-
 include/linux/trace_seq.h                 |   5 +-
 arch/powerpc/platforms/pseries/papr_scm.c |   4 +-
 lib/seq_buf.c                             |  35 +-
 lib/tests/seq_buf_kunit.c                 | 471 +++++++++++++++++++++-
 tools/testing/nvdimm/test/ndtest.c        |   2 +-
 7 files changed, 607 insertions(+), 22 deletions(-)

-- 
2.34.1