RE: [PATCH v8 1/6] arm64: hyperv: Add Hyper-V hypercall and register access utilities
From: Sunil Muthuswamy <hidden>
Date: 2021-03-03 20:58:19
Also in:
linux-efi, linux-hyperv, lkml
quoted
+ + /* + * Allocate a power of 2 size so alignment to that size is + * guaranteed, since the hypercall input and output areas + * must not cross a page boundary. + */ + input = kzalloc(roundup_pow_of_two(sizeof(input->header) + + sizeof(input->element[0])), GFP_ATOMIC); + output = kmalloc(roundup_pow_of_two(sizeof(*output)), GFP_ATOMIC); +Check for null from these malloc routines? Here and in other places.
Between, is there a plan to setup a percpu input/output page for hypercall input/output on ARM (like we do for x64)? I didn't check the specific size requirement for this particular call, but, that generally will remove the need for these allocations. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel