[PATCH v3 0/3] kbuild: remove gcc's -Wtype-limits

Vincent Mailhol
2025-12-20T11:03:08Z

I often read on the mailing list people saying "who cares about W=2
builds anyway?". At least I do. Not that I want to fix all of them,
but on some occasions, such as new driver submissions, I have often
found a couple valid diagnostics in the W=2 output.

That said, the annoying thing is that W=2 is heavily polluted by one
warning: -Wtype-limits. Try a gcc W=2 build on any file and see the
results for yourself. I suspect this to be the reason why so few
people are using W=2.

This series removes gcc's -Wtype-limits in an attempt to make W=2 more
useful. Those who do not use W=2 can continue to not use it if they
want. Those who, like me, use it for time to time will get an improved
experience from the reduced spam.

Patch #1 deactivates -Wtype-limits. Extra details on statistics, past
attempts and alternatives are given in the description.

Patch #2 clean-ups the local kbuild -Wno-type-limits exceptions, while
patch #3 undoes a local workaround which silenced that warning by
uglifying the code.

Signed-off-by: Vincent Mailhol <mailhol@kernel.org>
---
Changes in v3:

- Remove patch #4.

Link to v2: https://lore.kernel.org/r/20251219-remove_wtype-limits-v2-0-2e92b3f566c5@kernel.org

Changes in v2:

- Add two more patches to clean up some -Wtype-limits workarounds
- Collect the Reviewed-by tags.

Link to v1: https://lore.kernel.org/r/20251218-remove_wtype-limits-v1-0-735417536787@kernel.org

---
Vincent Mailhol (3):
kbuild: remove gcc's -Wtype-limits
kbuild: cleanup local -Wno-type-limits exceptions
overflow: Remove is_non_negative() and is_negative()

drivers/gpu/drm/Makefile | 1 -
fs/btrfs/Makefile | 1 -
include/linux/overflow.h | 10 ++--------
scripts/Makefile.warn | 4 +++-
4 files changed, 5 insertions(+), 11 deletions(-)
---
base-commit: 3e7f562e20ee87a25e104ef4fce557d39d62fa85
change-id: 20251205-remove_wtype-limits-c77eb46d09c2

Best regards,
--
Vincent Mailhol <mailhol@kernel.org>