[tip:x86/cleanups] x86/insn-eval: Mark expected switch-case fall-through

From: tip-bot for Gustavo A. R. Silva
Date: Sat Jan 26 2019 - 05:16:23 EST

Commit-ID: 89da3446294a8b811b28a4807e74e7ee7044d49f
Gitweb: https://git.kernel.org/tip/89da3446294a8b811b28a4807e74e7ee7044d49f
Author: Gustavo A. R. Silva <gustavo@xxxxxxxxxxxxxx>
AuthorDate: Fri, 25 Jan 2019 14:55:20 -0600
Committer: Borislav Petkov <bp@xxxxxxx>
CommitDate: Sat, 26 Jan 2019 10:46:42 +0100

x86/insn-eval: Mark expected switch-case fall-through

In preparation to enable -Wimplicit-fallthrough by default, mark
switch-case statements where fall-through is intentional, explicitly.

Thus fix the following warning:

arch/x86/lib/insn-eval.c: In function âresolve_default_segâ:
arch/x86/lib/insn-eval.c:179:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
if (insn->addr_bytes == 2)
arch/x86/lib/insn-eval.c:182:2: note: here
case -EDOM:

Warning level 3 was used: -Wimplicit-fallthrough=3

This is part of the ongoing efforts to enable -Wimplicit-fallthrough by

[ bp: Massage commit message. ]

Signed-off-by: Gustavo A. R. Silva <gustavo@xxxxxxxxxxxxxx>
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: x86-ml <x86@xxxxxxxxxx>
Link: 20190125205520.GA9602@embeddedor">https://lkml.kernel.org/r/20190125205520.GA9602@embeddedor
arch/x86/lib/insn-eval.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/arch/x86/lib/insn-eval.c b/arch/x86/lib/insn-eval.c
index 9119d8e41f1f..cf00ab6c6621 100644
--- a/arch/x86/lib/insn-eval.c
+++ b/arch/x86/lib/insn-eval.c
@@ -179,6 +179,8 @@ static int resolve_default_seg(struct insn *insn, struct pt_regs *regs, int off)
if (insn->addr_bytes == 2)
return -EINVAL;

+ /* fall through */
case -EDOM:
case offsetof(struct pt_regs, bx):
case offsetof(struct pt_regs, si):