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From: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
To: Russell King <linux@armlinux.org.uk>
Cc: linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org,
	"Gustavo A. R. Silva" <gustavo@embeddedor.com>,
	Stephen Rothwell <sfr@canb.auug.org.au>,
	Kees Cook <keescook@chromium.org>
Subject: [PATCH] ARM: alignment: Mark expected switch fall-throughs
Date: Sun, 28 Jul 2019 18:19:20 -0500	[thread overview]
Message-ID: <20190728231920.GA22247@embeddedor> (raw)

Mark switch cases where we are expecting to fall through.

This patch fixes the following warnings:

arch/arm/mm/alignment.c: In function 'thumb2arm':
arch/arm/mm/alignment.c:688:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
   if ((tinstr & (3 << 9)) == 0x0400) {
      ^
arch/arm/mm/alignment.c:700:2: note: here
  default:
  ^~~~~~~
arch/arm/mm/alignment.c: In function 'do_alignment_t32_to_handler':
arch/arm/mm/alignment.c:753:15: warning: this statement may fall through [-Wimplicit-fallthrough=]
   poffset->un = (tinst2 & 0xff) << 2;
   ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
arch/arm/mm/alignment.c:754:2: note: here
  case 0xe940:
  ^~~~

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
 arch/arm/mm/alignment.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mm/alignment.c b/arch/arm/mm/alignment.c
index 8cdb78642e93..04b36436cbc0 100644
--- a/arch/arm/mm/alignment.c
+++ b/arch/arm/mm/alignment.c
@@ -695,7 +695,7 @@ thumb2arm(u16 tinstr)
 			return subset[(L<<1) | ((tinstr & (1<<8)) >> 8)] |
 			    (tinstr & 255);		/* register_list */
 		}
-		/* Else fall through for illegal instruction case */
+		/* Else, fall through - for illegal instruction case */
 
 	default:
 		return BAD_INSTR;
@@ -751,6 +751,8 @@ do_alignment_t32_to_handler(unsigned long *pinstr, struct pt_regs *regs,
 	case 0xe8e0:
 	case 0xe9e0:
 		poffset->un = (tinst2 & 0xff) << 2;
+		/* Fall through */
+
 	case 0xe940:
 	case 0xe9c0:
 		return do_alignment_ldrdstrd;
-- 
2.22.0


WARNING: multiple messages have this Message-ID (diff)
From: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
To: Russell King <linux@armlinux.org.uk>
Cc: Kees Cook <keescook@chromium.org>,
	Stephen Rothwell <sfr@canb.auug.org.au>,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	"Gustavo A. R. Silva" <gustavo@embeddedor.com>
Subject: [PATCH] ARM: alignment: Mark expected switch fall-throughs
Date: Sun, 28 Jul 2019 18:19:20 -0500	[thread overview]
Message-ID: <20190728231920.GA22247@embeddedor> (raw)

Mark switch cases where we are expecting to fall through.

This patch fixes the following warnings:

arch/arm/mm/alignment.c: In function 'thumb2arm':
arch/arm/mm/alignment.c:688:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
   if ((tinstr & (3 << 9)) == 0x0400) {
      ^
arch/arm/mm/alignment.c:700:2: note: here
  default:
  ^~~~~~~
arch/arm/mm/alignment.c: In function 'do_alignment_t32_to_handler':
arch/arm/mm/alignment.c:753:15: warning: this statement may fall through [-Wimplicit-fallthrough=]
   poffset->un = (tinst2 & 0xff) << 2;
   ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
arch/arm/mm/alignment.c:754:2: note: here
  case 0xe940:
  ^~~~

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
 arch/arm/mm/alignment.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mm/alignment.c b/arch/arm/mm/alignment.c
index 8cdb78642e93..04b36436cbc0 100644
--- a/arch/arm/mm/alignment.c
+++ b/arch/arm/mm/alignment.c
@@ -695,7 +695,7 @@ thumb2arm(u16 tinstr)
 			return subset[(L<<1) | ((tinstr & (1<<8)) >> 8)] |
 			    (tinstr & 255);		/* register_list */
 		}
-		/* Else fall through for illegal instruction case */
+		/* Else, fall through - for illegal instruction case */
 
 	default:
 		return BAD_INSTR;
@@ -751,6 +751,8 @@ do_alignment_t32_to_handler(unsigned long *pinstr, struct pt_regs *regs,
 	case 0xe8e0:
 	case 0xe9e0:
 		poffset->un = (tinst2 & 0xff) << 2;
+		/* Fall through */
+
 	case 0xe940:
 	case 0xe9c0:
 		return do_alignment_ldrdstrd;
-- 
2.22.0


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             reply	other threads:[~2019-07-28 23:43 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-28 23:19 Gustavo A. R. Silva [this message]
2019-07-28 23:19 ` [PATCH] ARM: alignment: Mark expected switch fall-throughs Gustavo A. R. Silva
2019-07-29 16:34 ` Kees Cook
2019-07-29 16:34   ` Kees Cook

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