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From: Arnd Bergmann <arnd@kernel.org>
To: Rob Clark <robdclark@gmail.com>, Sean Paul <sean@poorly.run>,
	David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>
Cc: Arnd Bergmann <arnd@arndb.de>,
	Nathan Chancellor <nathan@kernel.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
	Abhinav Kumar <abhinavk@codeaurora.org>,
	Jonathan Marek <jonathan@marek.ca>,
	linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org,
	freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org,
	clang-built-linux@googlegroups.com
Subject: [PATCH] drm/msm/dsi: fix 32-bit clang warning
Date: Fri, 14 May 2021 23:30:17 +0200	[thread overview]
Message-ID: <20210514213032.575161-1-arnd@kernel.org> (raw)

From: Arnd Bergmann <arnd@arndb.de>

clang is a little overzealous with warning about a constant conversion
in an untaken branch of a ternary expression:

drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c:975:48: error: implicit conversion from 'unsigned long long' to 'unsigned long' changes value from 5000000000 to 705032704 [-Werror,-Wconstant-conversion]
        .max_pll_rate = (5000000000ULL < ULONG_MAX) ? 5000000000UL : ULONG_MAX,
                                                      ^~~~~~~~~~~~

Rewrite this to use a preprocessor conditional instead to avoid the
warning.

Fixes: 076437c9e360 ("drm/msm/dsi: move min/max PLL rate to phy config")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
As found with another patch, using __builtin_choose_expr() would
likely also work here, but doesn't seem any more readable.
---
 drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
index e76ce40a12ab..accd6b4eb7c2 100644
--- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
+++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
@@ -972,7 +972,11 @@ const struct msm_dsi_phy_cfg dsi_phy_7nm_cfgs = {
 		.restore_pll_state = dsi_7nm_pll_restore_state,
 	},
 	.min_pll_rate = 600000000UL,
-	.max_pll_rate = (5000000000ULL < ULONG_MAX) ? 5000000000ULL : ULONG_MAX,
+#ifdef CONFIG_64BIT
+	.max_pll_rate = 5000000000UL,
+#else
+	.max_pll_rate = ULONG_MAX,
+#endif
 	.io_start = { 0xae94400, 0xae96400 },
 	.num_dsi_phy = 2,
 	.quirks = DSI_PHY_7NM_QUIRK_V4_1,
-- 
2.29.2


WARNING: multiple messages have this Message-ID (diff)
From: Arnd Bergmann <arnd@kernel.org>
To: Rob Clark <robdclark@gmail.com>, Sean Paul <sean@poorly.run>,
	David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>
Cc: Arnd Bergmann <arnd@arndb.de>, Jonathan Marek <jonathan@marek.ca>,
	linux-arm-msm@vger.kernel.org,
	Nick Desaulniers <ndesaulniers@google.com>,
	linux-kernel@vger.kernel.org,
	Abhinav Kumar <abhinavk@codeaurora.org>,
	Nathan Chancellor <nathan@kernel.org>,
	clang-built-linux@googlegroups.com,
	dri-devel@lists.freedesktop.org,
	Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
	freedreno@lists.freedesktop.org
Subject: [PATCH] drm/msm/dsi: fix 32-bit clang warning
Date: Fri, 14 May 2021 23:30:17 +0200	[thread overview]
Message-ID: <20210514213032.575161-1-arnd@kernel.org> (raw)

From: Arnd Bergmann <arnd@arndb.de>

clang is a little overzealous with warning about a constant conversion
in an untaken branch of a ternary expression:

drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c:975:48: error: implicit conversion from 'unsigned long long' to 'unsigned long' changes value from 5000000000 to 705032704 [-Werror,-Wconstant-conversion]
        .max_pll_rate = (5000000000ULL < ULONG_MAX) ? 5000000000UL : ULONG_MAX,
                                                      ^~~~~~~~~~~~

Rewrite this to use a preprocessor conditional instead to avoid the
warning.

Fixes: 076437c9e360 ("drm/msm/dsi: move min/max PLL rate to phy config")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
As found with another patch, using __builtin_choose_expr() would
likely also work here, but doesn't seem any more readable.
---
 drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
index e76ce40a12ab..accd6b4eb7c2 100644
--- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
+++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
@@ -972,7 +972,11 @@ const struct msm_dsi_phy_cfg dsi_phy_7nm_cfgs = {
 		.restore_pll_state = dsi_7nm_pll_restore_state,
 	},
 	.min_pll_rate = 600000000UL,
-	.max_pll_rate = (5000000000ULL < ULONG_MAX) ? 5000000000ULL : ULONG_MAX,
+#ifdef CONFIG_64BIT
+	.max_pll_rate = 5000000000UL,
+#else
+	.max_pll_rate = ULONG_MAX,
+#endif
 	.io_start = { 0xae94400, 0xae96400 },
 	.num_dsi_phy = 2,
 	.quirks = DSI_PHY_7NM_QUIRK_V4_1,
-- 
2.29.2


             reply	other threads:[~2021-05-14 21:31 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-14 21:30 Arnd Bergmann [this message]
2021-05-14 21:30 ` [PATCH] drm/msm/dsi: fix 32-bit clang warning Arnd Bergmann
2021-05-14 21:43 ` Nathan Chancellor
2021-05-14 21:43   ` Nathan Chancellor
2021-05-14 22:07 ` Dmitry Baryshkov
2021-05-14 22:07   ` Dmitry Baryshkov

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