From fe52e597fdbfd1098d47bdf314a1974dac003227 Mon Sep 17 00:00:00 2001
From: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Date: Wed, 13 Sep 2017 14:52:54 +0300
Subject: [PATCH] drm/i915: Introduce INTEL_GEN_MASK
Git-commit: fe52e597fdbfd1098d47bdf314a1974dac003227
Patch-mainline: v4.15-rc1
References: FATE#322643 bsc#1055900

Split INTEL_GEN_MASK out of IS_GEN macro, and make it usable
within static declarations (unlike compound statements).

V2: 
- s/combound/compound/ (Tvrtko)
- Fix whitespace (yes, we need automatic checkpatch.pl)

Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170913115255.13851-1-joonas.lahtinen@linux.intel.com
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/i915/i915_drv.h |   22 ++++++++++------------
 1 file changed, 10 insertions(+), 12 deletions(-)

--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2880,23 +2880,21 @@ intel_info(const struct drm_i915_private
 #define INTEL_REVID(dev_priv)	((dev_priv)->drm.pdev->revision)
 
 #define GEN_FOREVER (0)
+
+#define INTEL_GEN_MASK(s, e) ( \
+	BUILD_BUG_ON_ZERO(!__builtin_constant_p(s)) + \
+	BUILD_BUG_ON_ZERO(!__builtin_constant_p(e)) + \
+	GENMASK((e) != GEN_FOREVER ? (e) - 1 : BITS_PER_LONG - 1, \
+		(s) != GEN_FOREVER ? (s) - 1 : 0) \
+)
+
 /*
  * Returns true if Gen is in inclusive range [Start, End].
  *
  * Use GEN_FOREVER for unbound start and or end.
  */
-#define IS_GEN(dev_priv, s, e) ({ \
-	unsigned int __s = (s), __e = (e); \
-	BUILD_BUG_ON(!__builtin_constant_p(s)); \
-	BUILD_BUG_ON(!__builtin_constant_p(e)); \
-	if ((__s) != GEN_FOREVER) \
-		__s = (s) - 1; \
-	if ((__e) == GEN_FOREVER) \
-		__e = BITS_PER_LONG - 1; \
-	else \
-		__e = (e) - 1; \
-	!!((dev_priv)->info.gen_mask & GENMASK((__e), (__s))); \
-})
+#define IS_GEN(dev_priv, s, e) \
+	(!!((dev_priv)->info.gen_mask & INTEL_GEN_MASK((s), (e))))
 
 /*
  * Return true if revision is in range [since,until] inclusive.