linux-hardening - [PATCH][next] drm/i915/display: Use fallthrough pseudo-keyword

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Message-ID: <20201008221842.GA9463@embeddedor>
Date:   Thu, 8 Oct 2020 17:18:42 -0500
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        linux-hardening@...r.kernel.org
Subject: [PATCH][next] drm/i915/display: Use fallthrough pseudo-keyword

In order to enable -Wimplicit-fallthrough for Clang[1], replace the
existing /* fall through */ comments with the new pseudo-keyword
macro fallthrough[2].

[1] https://git.kernel.org/linus/e2079e93f562c7f7a030eb7642017ee5eabaaa10
[2] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through

Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 drivers/gpu/drm/i915/display/intel_ddi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 4d06178cd76c..2941051ac3e1 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -1090,7 +1090,7 @@ ehl_get_combo_buf_trans(struct intel_encoder *encoder, int type, int rate,
 				return icl_combo_phy_ddi_translations_edp_hbr2;
 			}
 		}
-		/* fall through */
+		fallthrough;
 	default:
 		/* All combo DP and eDP ports that do not support low_vswing */
 		*n_entries = ARRAY_SIZE(ehl_combo_phy_ddi_translations_dp);
@@ -1126,7 +1126,7 @@ tgl_get_combo_buf_trans(struct intel_encoder *encoder, int type, int rate,
 			*n_entries = ARRAY_SIZE(icl_combo_phy_ddi_translations_edp_hbr2);
 			return icl_combo_phy_ddi_translations_edp_hbr2;
 		}
-		/* fall through */
+		fallthrough;
 	default:
 		/* All combo DP and eDP ports that do not support low_vswing */
 		if (rate > 270000) {
-- 
2.27.0