linux-kernel - [tip:perf/urgent] perf/x86/intel: Mark expected switch fall-throughs

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Date:   Thu, 25 Jul 2019 09:27:10 -0700
From:   "tip-bot for Gustavo A. R. Silva" <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kan.liang@...ux.intel.com,
        namhyung@...nel.org, jolsa@...hat.com, peterz@...radead.org,
        alexander.shishkin@...ux.intel.com, keescook@...omium.org,
        hpa@...or.com, bp@...en8.de, tglx@...utronix.de,
        torvalds@...ux-foundation.org, acme@...nel.org, mingo@...nel.org,
        gustavo@...eddedor.com
Subject: [tip:perf/urgent] perf/x86/intel: Mark expected switch
 fall-throughs

Commit-ID:  289a2d22b5b611d85030795802a710e9f520df29
Gitweb:     https://git.kernel.org/tip/289a2d22b5b611d85030795802a710e9f520df29
Author:     Gustavo A. R. Silva <gustavo@...eddedor.com>
AuthorDate: Mon, 24 Jun 2019 11:19:13 -0500
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 25 Jul 2019 15:57:03 +0200

perf/x86/intel: Mark expected switch fall-throughs

In preparation to enabling -Wimplicit-fallthrough, mark switch
cases where we are expecting to fall through.

This patch fixes the following warnings:

  arch/x86/events/intel/core.c: In function ‘intel_pmu_init’:
  arch/x86/events/intel/core.c:4959:8: warning: this statement may fall through [-Wimplicit-fallthrough=]
  arch/x86/events/intel/core.c:5008:8: warning: this statement may fall through [-Wimplicit-fallthrough=]

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

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

Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Kan Liang <kan.liang@...ux.intel.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: https://lkml.kernel.org/r/20190624161913.GA32270@embeddedor
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/events/intel/core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index c9075fc75cb6..648260b5f367 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -4954,6 +4954,7 @@ __init int intel_pmu_init(void)
 
 	case INTEL_FAM6_SKYLAKE_X:
 		pmem = true;
+		/* fall through */
 	case INTEL_FAM6_SKYLAKE_MOBILE:
 	case INTEL_FAM6_SKYLAKE_DESKTOP:
 	case INTEL_FAM6_KABYLAKE_MOBILE:
@@ -5003,6 +5004,7 @@ __init int intel_pmu_init(void)
 	case INTEL_FAM6_ICELAKE_X:
 	case INTEL_FAM6_ICELAKE_XEON_D:
 		pmem = true;
+		/* fall through */
 	case INTEL_FAM6_ICELAKE_MOBILE:
 	case INTEL_FAM6_ICELAKE_DESKTOP:
 		x86_pmu.late_ack = true;