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Date:   Tue, 29 Jan 2019 17:56:59 -0600
From:   "Gustavo A. R. Silva" <garsilva@embeddedor.com>
To:     Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        "H. Peter Anvin" <hpa@zytor.com>, x86@kernel.org
Cc:     linux-kernel@vger.kernel.org,
        Dominik Brodowski <linux@dominikbrodowski.net>,
        Andy Lutomirski <luto@kernel.org>,
        Kees Cook <keescook@chromium.org>
Subject: [PATCH] x86/syscalls: Mark expected switch fall-throughs
Message-ID: <20190129235659.GA8556@embeddedor>
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Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
User-Agent: Mutt/1.9.4 (2018-02-28)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

In preparation to enable -Wimplicit-fallthrough by default, mark
switch-case statements where fall-through is intentional, explicitly in
order to fix a bunch of -Wimplicit-fallthrough warnings.

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

Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
---
 arch/x86/include/asm/syscall.h | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/arch/x86/include/asm/syscall.h b/arch/x86/include/asm/syscall.h
index d653139857af..04fc5c120558 100644
--- a/arch/x86/include/asm/syscall.h
+++ b/arch/x86/include/asm/syscall.h
@@ -125,23 +125,30 @@ static inline void syscall_get_arguments(struct task_struct *task,
 		case 0:
 			if (!n--) break;
 			*args++ = regs->bx;
+			/* fall through */
 		case 1:
 			if (!n--) break;
 			*args++ = regs->cx;
+			/* fall through */
 		case 2:
 			if (!n--) break;
 			*args++ = regs->dx;
+			/* fall through */
 		case 3:
 			if (!n--) break;
 			*args++ = regs->si;
+			/* fall through */
 		case 4:
 			if (!n--) break;
 			*args++ = regs->di;
+			/* fall through */
 		case 5:
 			if (!n--) break;
 			*args++ = regs->bp;
+			/* fall through */
 		case 6:
 			if (!n--) break;
+			/* fall through */
 		default:
 			BUG();
 			break;
@@ -152,23 +159,30 @@ static inline void syscall_get_arguments(struct task_struct *task,
 		case 0:
 			if (!n--) break;
 			*args++ = regs->di;
+			/* fall through */
 		case 1:
 			if (!n--) break;
 			*args++ = regs->si;
+			/* fall through */
 		case 2:
 			if (!n--) break;
 			*args++ = regs->dx;
+			/* fall through */
 		case 3:
 			if (!n--) break;
 			*args++ = regs->r10;
+			/* fall through */
 		case 4:
 			if (!n--) break;
 			*args++ = regs->r8;
+			/* fall through */
 		case 5:
 			if (!n--) break;
 			*args++ = regs->r9;
+			/* fall through */
 		case 6:
 			if (!n--) break;
+			/* fall through */
 		default:
 			BUG();
 			break;
@@ -186,23 +200,30 @@ static inline void syscall_set_arguments(struct task_struct *task,
 		case 0:
 			if (!n--) break;
 			regs->bx = *args++;
+			/* fall through */
 		case 1:
 			if (!n--) break;
 			regs->cx = *args++;
+			/* fall through */
 		case 2:
 			if (!n--) break;
 			regs->dx = *args++;
+			/* fall through */
 		case 3:
 			if (!n--) break;
 			regs->si = *args++;
+			/* fall through */
 		case 4:
 			if (!n--) break;
 			regs->di = *args++;
+			/* fall through */
 		case 5:
 			if (!n--) break;
 			regs->bp = *args++;
+			/* fall through */
 		case 6:
 			if (!n--) break;
+			/* fall through */
 		default:
 			BUG();
 			break;
@@ -213,23 +234,30 @@ static inline void syscall_set_arguments(struct task_struct *task,
 		case 0:
 			if (!n--) break;
 			regs->di = *args++;
+			/* fall through */
 		case 1:
 			if (!n--) break;
 			regs->si = *args++;
+			/* fall through */
 		case 2:
 			if (!n--) break;
 			regs->dx = *args++;
+			/* fall through */
 		case 3:
 			if (!n--) break;
 			regs->r10 = *args++;
+			/* fall through */
 		case 4:
 			if (!n--) break;
 			regs->r8 = *args++;
+			/* fall through */
 		case 5:
 			if (!n--) break;
 			regs->r9 = *args++;
+			/* fall through */
 		case 6:
 			if (!n--) break;
+			/* fall through */
 		default:
 			BUG();
 			break;
-- 
2.20.1