[PATCH 0/2] riscv, bpf: fix reads of thread_info.cpu

[Alexandre Ghiti]

Hi Radim,

On 8/12/25 11:02, Radim Krčmář wrote:
> Hello,
>
> These patches are related to a recently queued series [1] that fixes the
> same bugs in normal code.  That series finishes with a patch that would
> have exposed the BPF bugs, but luckily it won't get merged until v6.18.
>
> I don't know enough about BPF to verify that it emits the correct code
> now, so any pointers are welcome.
>
> 1: https://lore.kernel.org/linux-riscv/20250725165410.2896641-3-rkrcmar@ventanamicro.com/
>
> Radim Krčmář (2):
>    riscv, bpf: use lw when reading int cpu in BPF_MOV64_PERCPU_REG
>    riscv, bpf: use lw when reading int cpu in bpf_get_smp_processor_id
>
>   arch/riscv/net/bpf_jit_comp64.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>

Both patches look good so:

Reviewed-by: Alexandre Ghiti <alexghiti at rivosinc.com>

Since this only touches riscv and I have a bunch of fixes pending, I 
propose to take those patches through the riscv tree, I'll just wait for 
Björn to confirm it is correct.

@Radim: This is the third similar bug, did you check all assembly code 
(and bpf) to make sure we don't have anymore left or should I?

Thanks,

Alex