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Fabian-Gruenbichler
35155c0132
fxsave and xsave require the target address to be 16-/64-byte aligned. kmalloc(_node) does not (yet) offer such fine-grained control over alignment[0,1], even though it does "the right thing" most of the time for power-of-2 sizes. unfortunately, alignment is completely off when using certain debugging or hardening features/configs, such as KASAN, slub_debug=Z or the not-yet-upstream SLAB_CANARY. Use alloc_pages_node() instead which allows us to allocate page-aligned memory. Since fpregs_state is padded to a full page anyway, and this code is only relevant for x86 which has 4k pages, this approach should not allocate any unnecessary memory but still guarantee the needed alignment. 0: https://lwn.net/Articles/787740/ 1: https://lore.kernel.org/linux-block/20190826111627.7505-1-vbabka@suse.cz/ Reviewed-by: Tony Hutter <hutter2@llnl.gov> Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #9608 Closes #9674