Re: [PATCH bpf-next v3 6/9] arm32, bpf: add support for 64 bit division instruction

On Thu, Sep 07, 2023 at 11:05:47PM +0000, Puranjay Mohan wrote:

ARM32 doesn't have instructions to do 64-bit/64-bit divisions. So, to implement the following instructions: BPF_ALU64 | BPF_DIV BPF_ALU64 | BPF_MOD BPF_ALU64 | BPF_SDIV BPF_ALU64 | BPF_SMOD

We implement the above instructions by doing function calls to div64_u64() and div64_u64_rem() for unsigned division/mod and calls to div64_s64() for signed division/mod.

Signed-off-by: Puranjay Mohan puranjay12@gmail.com

Reviewed-by: Russell King (Oracle) rmk+kernel@armlinux.org.uk

Thanks!