The recent thread [1] inspired me to look into guaranteeing alignment for kmalloc() for power-of-two sizes. Turns out it's not difficult and in most configuration nothing really changes as it happens implicitly. More details in the first patch. If we agree we want to do this, I will see where to update documentation and perhaps if there are any workarounds in the tree that can be converted to plain kmalloc() afterwards. The second patch is quick and dirty selftest for the alignment. Suggestions welcome whether and how to include this kind of selftest that has to be in-kernel. [1] https://lore.kernel.org/linux-fsdevel/20190225040904.5557-1-ming.lei@xxxxxxxxxx/T/#u Vlastimil Babka (2): mm, sl[aou]b: guarantee natural alignment for kmalloc(power-of-two) mm, sl[aou]b: test whether kmalloc() alignment works as expected mm/slab_common.c | 30 +++++++++++++++++++++++++++++- mm/slob.c | 42 +++++++++++++++++++++++++++++++----------- 2 files changed, 60 insertions(+), 12 deletions(-) -- 2.21.0
