[PATCH] powerpc: net: bpf_jit_comp: Fix misuse of fallthrough

[PATCH] powerpc: net: bpf_jit_comp: Fix misuse of fallthrough

[zhe.he]

From: He Zhe <zhe.he@windriver.com>

The user defined label following "fallthrough" is not considered by GCC
and causes build failure.

kernel-source/include/linux/compiler_attributes.h:208:41: error: attribute
'fallthrough' not preceding a case label or default label [-Werror]
 208   define fallthrough _attribute((fallthrough_))
                          ^~~~~~~~~~~~~

Signed-off-by: He Zhe <zhe.he@windriver.com>
---
 arch/powerpc/net/bpf_jit_comp.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c
index 78d61f97371e..e809cb5a1631 100644
--- a/arch/powerpc/net/bpf_jit_comp.c
+++ b/arch/powerpc/net/bpf_jit_comp.c
@@ -475,7 +475,6 @@ static int bpf_jit_build_body(struct bpf_prog *fp, u32 *image,
 		case BPF_JMP | BPF_JSET | BPF_K:
 		case BPF_JMP | BPF_JSET | BPF_X:
 			true_cond = COND_NE;
-			fallthrough;
 		cond_branch:
 			/* same targets, can avoid doing the test :) */
 			if (filter[i].jt == filter[i].jf) {
-- 
2.26.2

Re: [PATCH] powerpc: net: bpf_jit_comp: Fix misuse of fallthrough

[Daniel Borkmann]

On 9/28/20 11:00 AM, zhe.he@windriver.com wrote:
> From: He Zhe <zhe.he@windriver.com>
> 
> The user defined label following "fallthrough" is not considered by GCC
> and causes build failure.
> 
> kernel-source/include/linux/compiler_attributes.h:208:41: error: attribute
> 'fallthrough' not preceding a case label or default label [-Werror]
>   208   define fallthrough _attribute((fallthrough_))
>                            ^~~~~~~~~~~~~
> 
> Signed-off-by: He Zhe <zhe.he@windriver.com>

Applied, thanks! I've also added Fixes tag with df561f6688fe ("treewide: Use fallthrough pseudo-keyword")
which added the bug.