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| author | Dave Thaler <dthaler@microsoft.com> | 2023-10-17 23:30:20 +0300 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2023-10-19 02:36:12 +0300 |
| commit | 0e133a13370389d3894891eafe54fec2c44ad735 (patch) | |
| tree | 54f3b6815025572d7a5bcf028caf6a37bce626c3 /mm/process_vm_access.c | |
| parent | bb6a88885fde24835afdaa1c5bb976a1bf5c5d71 (diff) | |
| download | linux-0e133a13370389d3894891eafe54fec2c44ad735.tar.xz | |
bpf, docs: Define signed modulo as using truncated division
There's different mathematical definitions (truncated, floored, rounded,
etc.) and different languages have chosen different definitions [0][1].
E.g., languages/libraries that follow Knuth use a different mathematical
definition than C uses. This patch specifies which definition BPF uses,
as verified by Eduard [2] and others.
[0] https://en.wikipedia.org/wiki/Modulo#Variants_of_the_definition
[1] https://torstencurdt.com/tech/posts/modulo-of-negative-numbers/
[2] https://lore.kernel.org/bpf/57e6fefadaf3b2995bb259fa8e711c7220ce5290.camel@gmail.com/
Signed-off-by: Dave Thaler <dthaler@microsoft.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: David Vernet <void@manifault.com>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/bpf/20231017203020.1500-1-dthaler1968@googlemail.com
Diffstat (limited to 'mm/process_vm_access.c')
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