linux-kernel - [PATCH] [RESEND] drm/nouveau/clk: fix gcc-7 -Wint-in-bool-context warning

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Message-Id: <20170906135628.3513172-1-arnd@arndb.de>
Date:   Wed,  6 Sep 2017 15:56:08 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Ben Skeggs <bskeggs@...hat.com>, David Airlie <airlied@...ux.ie>
Cc:     Arnd Bergmann <arnd@...db.de>, dri-devel@...ts.freedesktop.org,
        nouveau@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH] [RESEND] drm/nouveau/clk: fix gcc-7 -Wint-in-bool-context warning

gcc thinks that interpreting a multiplication result as a bool
is confusing:

drivers/gpu/drm/nouveau/nvkm/subdev/clk/gt215.c: In function 'read_pll':
drivers/gpu/drm/nouveau/nvkm/subdev/clk/gt215.c:133:8: error: '*' in boolean context, suggest '&&' instead [-Werror=int-in-bool-context]

In this instance, I think using multiplication is more intuitive
than '&&', so I'm adding a comparison to zero instead to shut up
the warning. To further improve readability, I also make the
error case indented and leave the normal case as the final 'return'
statement.

Fixes: 7632b30e4b8b ("drm/nouveau/clk: namespace + nvidia gpu names (no binary change)")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
Originally submitted on July 14, but no reply. This is the same
patch again. The warning is currently disabled in mainline, but
I think we can turn it back on in the future, and this change here
seems harmless.
---
 drivers/gpu/drm/nouveau/nvkm/subdev/clk/gt215.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/clk/gt215.c b/drivers/gpu/drm/nouveau/nvkm/subdev/clk/gt215.c
index 96e0941c8edd..04b4f4ccf186 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/clk/gt215.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/clk/gt215.c
@@ -130,10 +130,10 @@ read_pll(struct gt215_clk *clk, int idx, u32 pll)
 		sclk = read_clk(clk, 0x10 + idx, false);
 	}
 
-	if (M * P)
-		return sclk * N / (M * P);
+	if (M * P == 0)
+		return 0;
 
-	return 0;
+	return sclk * N / (M * P);
 }
 
 static int
-- 
2.9.0