* [PATCH] bpf: Remove unused but set variables
@ 2016-11-08 15:40 Tobias Klauser
2016-11-08 21:45 ` Alexei Starovoitov
2016-11-10 2:15 ` David Miller
0 siblings, 2 replies; 3+ messages in thread
From: Tobias Klauser @ 2016-11-08 15:40 UTC (permalink / raw)
To: Alexei Starovoitov; +Cc: netdev, Josef Bacik
Remove the unused but set variables min_set and max_set in
adjust_reg_min_max_vals to fix the following warning when building with
'W=1':
kernel/bpf/verifier.c:1483:7: warning: variable ‘min_set’ set but not used [-Wunused-but-set-variable]
There is no warning about max_set being unused, but since it is only
used in the assignment of min_set it can be removed as well.
They were introduced in commit 484611357c19 ("bpf: allow access into map
value arrays") but seem to have never been used.
Cc: Josef Bacik <jbacik@fb.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
---
kernel/bpf/verifier.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 846d7ceaf202..14345be4a2d2 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -1480,7 +1480,6 @@ static void adjust_reg_min_max_vals(struct bpf_verifier_env *env,
{
struct bpf_reg_state *regs = env->cur_state.regs, *dst_reg;
u64 min_val = BPF_REGISTER_MIN_RANGE, max_val = BPF_REGISTER_MAX_RANGE;
- bool min_set = false, max_set = false;
u8 opcode = BPF_OP(insn->code);
dst_reg = ®s[insn->dst_reg];
@@ -1503,7 +1502,6 @@ static void adjust_reg_min_max_vals(struct bpf_verifier_env *env,
} else if (insn->imm < BPF_REGISTER_MAX_RANGE &&
(s64)insn->imm > BPF_REGISTER_MIN_RANGE) {
min_val = max_val = insn->imm;
- min_set = max_set = true;
}
/* We don't know anything about what was done to this register, mark it
--
2.9.0
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] bpf: Remove unused but set variables
2016-11-08 15:40 [PATCH] bpf: Remove unused but set variables Tobias Klauser
@ 2016-11-08 21:45 ` Alexei Starovoitov
2016-11-10 2:15 ` David Miller
1 sibling, 0 replies; 3+ messages in thread
From: Alexei Starovoitov @ 2016-11-08 21:45 UTC (permalink / raw)
To: Tobias Klauser; +Cc: Alexei Starovoitov, netdev, Josef Bacik
On Tue, Nov 08, 2016 at 04:40:28PM +0100, Tobias Klauser wrote:
> Remove the unused but set variables min_set and max_set in
> adjust_reg_min_max_vals to fix the following warning when building with
> 'W=1':
>
> kernel/bpf/verifier.c:1483:7: warning: variable ‘min_set’ set but not used [-Wunused-but-set-variable]
>
> There is no warning about max_set being unused, but since it is only
> used in the assignment of min_set it can be removed as well.
>
> They were introduced in commit 484611357c19 ("bpf: allow access into map
> value arrays") but seem to have never been used.
>
> Cc: Josef Bacik <jbacik@fb.com>
> Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
> ---
Acked-by: Alexei Starovoitov <ast@kernel.org>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] bpf: Remove unused but set variables
2016-11-08 15:40 [PATCH] bpf: Remove unused but set variables Tobias Klauser
2016-11-08 21:45 ` Alexei Starovoitov
@ 2016-11-10 2:15 ` David Miller
1 sibling, 0 replies; 3+ messages in thread
From: David Miller @ 2016-11-10 2:15 UTC (permalink / raw)
To: tklauser; +Cc: ast, netdev, jbacik
From: Tobias Klauser <tklauser@distanz.ch>
Date: Tue, 8 Nov 2016 16:40:28 +0100
> Remove the unused but set variables min_set and max_set in
> adjust_reg_min_max_vals to fix the following warning when building with
> 'W=1':
>
> kernel/bpf/verifier.c:1483:7: warning: variable ‘min_set’ set but not used [-Wunused-but-set-variable]
>
> There is no warning about max_set being unused, but since it is only
> used in the assignment of min_set it can be removed as well.
>
> They were introduced in commit 484611357c19 ("bpf: allow access into map
> value arrays") but seem to have never been used.
>
> Cc: Josef Bacik <jbacik@fb.com>
> Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Applied to net-next, thanks.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2016-11-08 15:40 [PATCH] bpf: Remove unused but set variables Tobias Klauser
2016-11-08 21:45 ` Alexei Starovoitov
2016-11-10 2:15 ` David Miller
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