On Mon, Mar 25, 2024 at 03:54:34PM +0000, Puranjay Mohan wrote: > LLVM generates bpf_addr_space_cast instruction while translating > pointers between native (zero) address space and > __attribute__((address_space(N))). The addr_space=0 is reserved as > bpf_arena address space. > > rY = addr_space_cast(rX, 0, 1) is processed by the verifier and > converted to normal 32-bit move: wX = wY > > rY = addr_space_cast(rX, 1, 0) has to be converted by JIT. > > Signed-off-by: Puranjay Mohan <puranjay12@xxxxxxxxx> Doesn't compile for allmodconfig: ../arch/riscv/net/bpf_jit_comp64.c:1086:7: error: call to undeclared function 'insn_is_cast_user'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] Cheers, Conor.
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