Re: [PATCH bpf-next v2 5/8] arm32, bpf: add support for 32-bit signed division

On Wed, Sep 06, 2023 at 06:33:17PM +0000, Puranjay Mohan wrote:

The cpuv4 added a new BPF_SDIV instruction that does signed division. The encoding is similar to BPF_DIV but BPF_SDIV sets offset=1.

ARM32 already supports 32-bit BPF_DIV which can be easily extended to support BPF_SDIV as ARM32 has the SDIV instruction. When the CPU is not ARM-v7, we implement that SDIV/SMOD with the function call similar to the implementation of DIV/MOD.

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

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

Thanks, this is a lot more clear!