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Groups > linux.kernel > #1703448
| From | Andrew Morton <akpm@linux-foundation.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v2] bitops: Avoid integer overflow in GENMASK(_ULL) |
| Date | 2017-08-03 23:50 +0200 |
| Message-ID | <uawad-5UG-13@gated-at.bofh.it> (permalink) |
| References | <uavQR-5Ka-7@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Thu, 3 Aug 2017 14:20:20 -0700 Matthias Kaehlcke <mka@chromium.org> wrote: > GENMASK(_ULL) performs a left-shift of ~0UL(L), which technically > results in an integer overflow. clang raises a warning if the overflow > occurs in a preprocessor expression. That's just irritaing. > Clear the low-order bits through > a substraction instead of the left-shift to avoid the overflow. There's no change in .text size for a few files I tested so guess we can live with it.
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[PATCH v2] bitops: Avoid integer overflow in GENMASK(_ULL) Matthias Kaehlcke <mka@chromium.org> - 2017-08-03 23:30 +0200 Re: [PATCH v2] bitops: Avoid integer overflow in GENMASK(_ULL) Andrew Morton <akpm@linux-foundation.org> - 2017-08-03 23:50 +0200
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