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authorJason A. Donenfeld <Jason@zx2c4.com>2022-10-19 23:19:35 -0600
committerJason A. Donenfeld <Jason@zx2c4.com>2022-11-18 02:15:12 +0100
commit7f576b2593a978451416424e75f69ad1e3ae4efe (patch)
treeaec27836d4be841b9aa495e2fb577b06d1f964fb /net/sched/act_sample.c
parente9a688bcb19348862afe30d7c85bc37c4c293471 (diff)
downloadlinux-next-7f576b2593a978451416424e75f69ad1e3ae4efe.tar.gz
random: add helpers for random numbers with given floor or range
Now that we have get_random_u32_below(), it's nearly trivial to make inline helpers to compute get_random_u32_above() and get_random_u32_inclusive(), which will help clean up open coded loops and manual computations throughout the tree. One snag is that in order to make get_random_u32_inclusive() operate on closed intervals, we have to do some (unlikely) special case handling if get_random_u32_inclusive(0, U32_MAX) is called. The least expensive way of doing this is actually to adjust the slowpath of get_random_u32_below() to have its undefined 0 result just return the output of get_random_u32(). We can make this basically free by calling get_random_u32() before the branch, so that the branch latency gets interleaved. Cc: stable@vger.kernel.org # to ease future backports that use this api Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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