Hello:
This series was applied to bpf/bpf-next.git (master)
by Alexei Starovoitov <ast@xxxxxxxxxx>:
On Tue, 23 Jul 2024 09:29:33 -0700 you wrote:
> With latest llvm19, the selftest iters/iter_arr_with_actual_elem_count
> failed with -mcpu=v4.
>
> The following are the details:
> 0: R1=ctx() R10=fp0
> ; int iter_arr_with_actual_elem_count(const void *ctx) @ iters.c:1420
> 0: (b4) w7 = 0 ; R7_w=0
> ; int i, n = loop_data.n, sum = 0; @ iters.c:1422
> 1: (18) r1 = 0xffffc90000191478 ; R1_w=map_value(map=iters.bss,ks=4,vs=1280,off=1144)
> 3: (61) r6 = *(u32 *)(r1 +128) ; R1_w=map_value(map=iters.bss,ks=4,vs=1280,off=1144) R6_w=scalar(smin=0,smax=umax=0xffffffff,var_off=(0x0; 0xffffffff))
> ; if (n > ARRAY_SIZE(loop_data.data)) @ iters.c:1424
> 4: (26) if w6 > 0x20 goto pc+27 ; R6_w=scalar(smin=smin32=0,smax=umax=smax32=umax32=32,var_off=(0x0; 0x3f))
> 5: (bf) r8 = r10 ; R8_w=fp0 R10=fp0
> 6: (07) r8 += -8 ; R8_w=fp-8
> ; bpf_for(i, 0, n) { @ iters.c:1427
> 7: (bf) r1 = r8 ; R1_w=fp-8 R8_w=fp-8
> 8: (b4) w2 = 0 ; R2_w=0
> 9: (bc) w3 = w6 ; R3_w=scalar(id=1,smin=smin32=0,smax=umax=smax32=umax32=32,var_off=(0x0; 0x3f)) R6_w=scalar(id=1,smin=smin32=0,smax=umax=smax32=umax32=32,var_off=(0x0; 0x3f))
> 10: (85) call bpf_iter_num_new#45179 ; R0=scalar() fp-8=iter_num(ref_id=2,state=active,depth=0) refs=2
> 11: (bf) r1 = r8 ; R1=fp-8 R8=fp-8 refs=2
> 12: (85) call bpf_iter_num_next#45181 13: R0=rdonly_mem(id=3,ref_obj_id=2,sz=4) R6=scalar(id=1,smin=smin32=0,smax=umax=smax32=umax32=32,var_off=(0x0; 0x3f)) R7=0 R8=fp-8 R10=fp0 fp-8=iter_num(ref_id=2,state=active,depth=1) refs=2
> ; bpf_for(i, 0, n) { @ iters.c:1427
> 13: (15) if r0 == 0x0 goto pc+2 ; R0=rdonly_mem(id=3,ref_obj_id=2,sz=4) refs=2
> 14: (81) r1 = *(s32 *)(r0 +0) ; R0=rdonly_mem(id=3,ref_obj_id=2,sz=4) R1_w=scalar(smin=0xffffffff80000000,smax=0x7fffffff) refs=2
> 15: (ae) if w1 < w6 goto pc+4 20: R0=rdonly_mem(id=3,ref_obj_id=2,sz=4) R1=scalar(smin=0xffffffff80000000,smax=smax32=umax32=31,umax=0xffffffff0000001f,smin32=0,var_off=(0x0; 0xffffffff0000001f)) R6=scalar(id=1,smin=umin=smin32=umin32=1,smax=umax=smax32=umax32=32,var_off=(0x0; 0x3f)) R7=0 R8=fp-8 R10=fp0 fp-8=iter_num(ref_id=2,state=active,depth=1) refs=2
> ; sum += loop_data.data[i]; @ iters.c:1429
> 20: (67) r1 <<= 2 ; R1_w=scalar(smax=0x7ffffffc0000007c,umax=0xfffffffc0000007c,smin32=0,smax32=umax32=124,var_off=(0x0; 0xfffffffc0000007c)) refs=2
> 21: (18) r2 = 0xffffc90000191478 ; R2_w=map_value(map=iters.bss,ks=4,vs=1280,off=1144) refs=2
> 23: (0f) r2 += r1
> math between map_value pointer and register with unbounded min value is not allowed
>
> [...]
Here is the summary with links:
- [bpf-next,v5,1/2] bpf: Get better reg range with ldsx and 32bit compare
https://git.kernel.org/bpf/bpf-next/c/2e716457a823
- [bpf-next,v5,2/2] selftests/bpf: Add reg_bounds tests for ldsx and subreg compare
https://git.kernel.org/bpf/bpf-next/c/1d6189935f1d
You are awesome, thank you!
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