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authorAlexander Alemayhu <alexander@alemayhu.com>2017-02-14 00:02:35 +0100
committerDavid S. Miller <davem@davemloft.net>2017-02-14 14:32:12 -0500
commit7e57fbb2a341b5d44d30e71a6d782c5e6dbc429c (patch)
treeb65b177a07d1807791e49b9cfed419b8a173fca8 /kernel
parent2be4cb973f0cfaf051224fa5bc969c71c9fc3d5b (diff)
downloadlinux-7e57fbb2a341b5d44d30e71a6d782c5e6dbc429c.tar.bz2
bpf: reduce compiler warnings by adding fallthrough comments
Fixes the following warnings: kernel/bpf/verifier.c: In function ‘may_access_direct_pkt_data’: kernel/bpf/verifier.c:702:6: warning: this statement may fall through [-Wimplicit-fallthrough=] if (t == BPF_WRITE) ^ kernel/bpf/verifier.c:704:2: note: here case BPF_PROG_TYPE_SCHED_CLS: ^~~~ kernel/bpf/verifier.c: In function ‘reg_set_min_max_inv’: kernel/bpf/verifier.c:2057:23: warning: this statement may fall through [-Wimplicit-fallthrough=] true_reg->min_value = 0; ~~~~~~~~~~~~~~~~~~~~^~~ kernel/bpf/verifier.c:2058:2: note: here case BPF_JSGT: ^~~~ kernel/bpf/verifier.c:2068:23: warning: this statement may fall through [-Wimplicit-fallthrough=] true_reg->min_value = 0; ~~~~~~~~~~~~~~~~~~~~^~~ kernel/bpf/verifier.c:2069:2: note: here case BPF_JSGE: ^~~~ kernel/bpf/verifier.c: In function ‘reg_set_min_max’: kernel/bpf/verifier.c:2009:24: warning: this statement may fall through [-Wimplicit-fallthrough=] false_reg->min_value = 0; ~~~~~~~~~~~~~~~~~~~~~^~~ kernel/bpf/verifier.c:2010:2: note: here case BPF_JSGT: ^~~~ kernel/bpf/verifier.c:2019:24: warning: this statement may fall through [-Wimplicit-fallthrough=] false_reg->min_value = 0; ~~~~~~~~~~~~~~~~~~~~~^~~ kernel/bpf/verifier.c:2020:2: note: here case BPF_JSGE: ^~~~ Reported-by: David Binderman <dcb314@hotmail.com> Signed-off-by: Alexander Alemayhu <alexander@alemayhu.com> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/bpf/verifier.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 1a754e5d2695..d2bded2b250c 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -701,6 +701,7 @@ static bool may_access_direct_pkt_data(struct bpf_verifier_env *env,
/* dst_input() and dst_output() can't write for now */
if (t == BPF_WRITE)
return false;
+ /* fallthrough */
case BPF_PROG_TYPE_SCHED_CLS:
case BPF_PROG_TYPE_SCHED_ACT:
case BPF_PROG_TYPE_XDP:
@@ -2007,6 +2008,7 @@ static void reg_set_min_max(struct bpf_reg_state *true_reg,
case BPF_JGT:
/* Unsigned comparison, the minimum value is 0. */
false_reg->min_value = 0;
+ /* fallthrough */
case BPF_JSGT:
/* If this is false then we know the maximum val is val,
* otherwise we know the min val is val+1.
@@ -2017,6 +2019,7 @@ static void reg_set_min_max(struct bpf_reg_state *true_reg,
case BPF_JGE:
/* Unsigned comparison, the minimum value is 0. */
false_reg->min_value = 0;
+ /* fallthrough */
case BPF_JSGE:
/* If this is false then we know the maximum value is val - 1,
* otherwise we know the mimimum value is val.
@@ -2055,6 +2058,7 @@ static void reg_set_min_max_inv(struct bpf_reg_state *true_reg,
case BPF_JGT:
/* Unsigned comparison, the minimum value is 0. */
true_reg->min_value = 0;
+ /* fallthrough */
case BPF_JSGT:
/*
* If this is false, then the val is <= the register, if it is
@@ -2066,6 +2070,7 @@ static void reg_set_min_max_inv(struct bpf_reg_state *true_reg,
case BPF_JGE:
/* Unsigned comparison, the minimum value is 0. */
true_reg->min_value = 0;
+ /* fallthrough */
case BPF_JSGE:
/* If this is false then constant < register, if it is true then
* the register < constant.