linux-kernel - [PATCH] drm/i915: fix build for CONFIG

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Message-Id: <1421070331-29650-1-git-send-email-jani.nikula@intel.com>
Date:	Mon, 12 Jan 2015 15:45:31 +0200
From:	Jani Nikula <jani.nikula@...el.com>
To:	intel-gfx@...ts.freedesktop.org
Cc:	Rob Clark <robdclark@...il.com>, Jim Davis <jim.epost@...il.com>,
	jani.nikula@...el.com, Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next <linux-next@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	daniel.vetter@...el.com, David Airlie <airlied@...ux.ie>,
	dri-devel <dri-devel@...ts.freedesktop.org>
Subject: [PATCH] drm/i915: fix build for CONFIG_BUG=n

If CONFIG_BUG=n __WARN_printf won't be defined leading to the below
build failure. The double underscores should have told us to steer clear
of it anyway.

drivers/gpu/drm/i915/intel_display.c: In function ‘assert_pll’:
drivers/gpu/drm/i915/intel_display.c:1027:2: error: implicit declaration
of function ‘__WARN_printf’ [-Werror=implicit-function-declaration]
  I915_STATE_WARN(cur_state != state,

Use WARN(1, ...) instead. It handles CONFIG_BUG=n gracefully and, with
the constant condition, a sane compiler should reduce it to
__WARN_printf.

This is a regression introduced by

commit e2c719b75c8c186deb86570d8466df9e9eff919b
Author: Rob Clark <robdclark@...il.com>
Date:   Mon Dec 15 13:56:32 2014 -0500

    drm/i915: tame the chattermouth (v2)

Reported-by: Jim Davis <jim.epost@...il.com>
Reference: http://mid.gmane.org/CA+r1ZhgHTi7bS2irhtuSUs9aO=Br1dumN8=oAOeaMJDZ_ZhwBw@mail.gmail.com
Cc: Rob Clark <robdclark@...il.com>
Signed-off-by: Jani Nikula <jani.nikula@...el.com>
---
 drivers/gpu/drm/i915/i915_drv.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index e008fa0c58da..66f0c607dbef 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -83,7 +83,7 @@
 	int __ret_warn_on = !!(condition);				\
 	if (unlikely(__ret_warn_on)) {					\
 		if (i915.verbose_state_checks)				\
-			__WARN_printf(format);				\
+			WARN(1, format);				\
 		else 							\
 			DRM_ERROR(format);				\
 	}								\
@@ -94,7 +94,7 @@
 	int __ret_warn_on = !!(condition);				\
 	if (unlikely(__ret_warn_on)) {					\
 		if (i915.verbose_state_checks)				\
-			__WARN_printf("WARN_ON(" #condition ")\n");	\
+			WARN(1, "WARN_ON(" #condition ")\n");		\
 		else 							\
 			DRM_ERROR("WARN_ON(" #condition ")\n");		\
 	}								\
-- 
2.1.4

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