lib: fix _parse_integer_limit() to handle overflow

Patch series "lib and lib/cmdline enhancements", v11.

This series is a merge of the recently posted [1] and [2].  The first one
is intended to adjust '_parse_integer_limit()' and 'memparse()' to not
ignore overflows, extend string to 64-bit integer conversion tests, add
KUnit-based test for 'memparse()' and fix kernel-doc glitches found in
lib/cmdline.c.  The second one was originated from RISCV-specific build
fixes needed to integrate the former and now aims to provide
platform-specific double-word shifts and corresponding KUnit test.

Getting feedback from RISCV core maintainers would be very helpful.

Special thanks to Andy Shevchenko, Charlie Jenkins, and Andrew Morton.


This patch (of 8):

In '_parse_integer_limit()', adjust native integer arithmetic with
near-to-overflow branch where 'check_mul_overflow()' and
'check_add_overflow()' are used to check whether an intermediate result
goes out of range, and denote such a case with ULLONG_MAX, thus making the
function more similar to standard C library's 'strtoull()'.  Adjust
comment to kernel-doc style as well.

Link: https://lore.kernel.org/20260519172259.908980-1-dmantipov@yandex.ru
Link: https://lore.kernel.org/20260519172259.908980-2-dmantipov@yandex.ru
Link: https://lore.kernel.org/linux-riscv/20260403103338.1122415-1-dmantipov@yandex.ru [1]
Link: https://lore.kernel.org/linux-riscv/20260427090105.705529-1-dmantipov@yandex.ru [2]
Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Alexandre Ghiti <alex@ghiti.fr>
Cc: Andriy Shevchenko <andriy.shevchenko@intel.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Charlie Jenkins <thecharlesjenkins@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

0 files changed, 0 insertions, 0 deletions