2020-08-16 07:18:24

by Miaohe Lin

Subject: [PATCH v2] bpf: Convert to use the preferred fallthrough macro

Since commit 294f69e662d1 ("compiler_attributes.h: Add 'fallthrough' pseudo
keyword for switch/case use") introduce fallthrough pseudo keyword, then we
should convert the uses of fallthrough comments to it.

Signed-off-by: Miaohe Lin <[email protected]>
---
kernel/bpf/cgroup.c | 1 -
kernel/bpf/cpumap.c | 2 +-
kernel/bpf/syscall.c | 2 +-
kernel/bpf/verifier.c | 6 +++---
4 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/kernel/bpf/cgroup.c b/kernel/bpf/cgroup.c
index 83ff127ef7ae..daeafd5b6ced 100644
--- a/kernel/bpf/cgroup.c
+++ b/kernel/bpf/cgroup.c
@@ -1794,7 +1794,6 @@ static bool cg_sockopt_is_valid_access(int off, int size,
return prog->expected_attach_type ==
BPF_CGROUP_GETSOCKOPT;
case offsetof(struct bpf_sockopt, optname):
- /* fallthrough */
case offsetof(struct bpf_sockopt, level):
if (size != size_default)
return false;
diff --git a/kernel/bpf/cpumap.c b/kernel/bpf/cpumap.c
index f1c46529929b..6386b7bb98f2 100644
--- a/kernel/bpf/cpumap.c
+++ b/kernel/bpf/cpumap.c
@@ -279,7 +279,7 @@ static int cpu_map_bpf_prog_run_xdp(struct bpf_cpu_map_entry *rcpu,
break;
default:
bpf_warn_invalid_xdp_action(act);
- /* fallthrough */
+ fallthrough;
case XDP_DROP:
xdp_return_frame(xdpf);
stats->drop++;
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 86299a292214..1bf960aa615c 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -2029,7 +2029,7 @@ bpf_prog_load_check_attach(enum bpf_prog_type prog_type,
case BPF_PROG_TYPE_EXT:
if (expected_attach_type)
return -EINVAL;
- /* fallthrough */
+ fallthrough;
default:
return 0;
}
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index ef938f17b944..1e7f34663f86 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -2639,7 +2639,7 @@ static bool may_access_direct_pkt_data(struct bpf_verifier_env *env,
case BPF_PROG_TYPE_CGROUP_SKB:
if (t == BPF_WRITE)
return false;
- /* fallthrough */
+ fallthrough;

/* Program types with direct read + write access go here! */
case BPF_PROG_TYPE_SCHED_CLS:
@@ -5236,7 +5236,7 @@ static int adjust_ptr_min_max_vals(struct bpf_verifier_env *env,
off_reg == dst_reg ? dst : src);
return -EACCES;
}
- /* fall-through */
+ fallthrough;
default:
break;
}
@@ -10988,7 +10988,7 @@ static int check_attach_btf_id(struct bpf_verifier_env *env)
default:
if (!prog_extension)
return -EINVAL;
- /* fallthrough */
+ fallthrough;
case BPF_MODIFY_RETURN:
case BPF_LSM_MAC:
case BPF_TRACE_FENTRY:
--
2.19.1

2020-08-16 08:05:34

by Yonghong Song

Subject: Re: [PATCH v2] bpf: Convert to use the preferred fallthrough macro

On 8/15/20 1:47 AM, Miaohe Lin wrote:
> Since commit 294f69e662d1 ("compiler_attributes.h: Add 'fallthrough' pseudo
> keyword for switch/case use") introduce fallthrough pseudo keyword, then we
> should convert the uses of fallthrough comments to it.
>
> Signed-off-by: Miaohe Lin <[email protected]>

Acked-by: Yonghong Song <[email protected]>