linux-kernel - [PATCH] drm/i915/gmch: fix build error var set but not used

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Date:   Thu, 10 Aug 2023 21:56:39 +0800
From:   Wang Jinchao <wangjinchao@...sion.com>
To:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        <intel-gfx@...ts.freedesktop.org>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
CC:     <stone.xulei@...sion.com>
Subject: [PATCH] drm/i915/gmch: fix build error var set but not used

When CONFIG_PNP is not defined, i915 will fail to compile with error bellow:
	drivers/gpu/drm/i915/soc/intel_gmch.c:43:13: error: variable ‘mchbar_addr’ set but not used
Fix it by surrounding variable declaration and assignment with ifdef

Signed-off-by: Wang Jinchao <wangjinchao@...sion.com>
---
 drivers/gpu/drm/i915/soc/intel_gmch.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/soc/intel_gmch.c b/drivers/gpu/drm/i915/soc/intel_gmch.c
index 6d0204942f7a..d2c442b0b4eb 100644
--- a/drivers/gpu/drm/i915/soc/intel_gmch.c
+++ b/drivers/gpu/drm/i915/soc/intel_gmch.c
@@ -38,16 +38,17 @@ intel_alloc_mchbar_resource(struct drm_i915_private *i915)
 {
 	int reg = GRAPHICS_VER(i915) >= 4 ? MCHBAR_I965 : MCHBAR_I915;
 	u32 temp_lo, temp_hi = 0;
-	u64 mchbar_addr;
 	int ret;
-
+#ifdef CONFIG_PNP
+	u64 mchbar_addr;
+#endif
 	if (GRAPHICS_VER(i915) >= 4)
 		pci_read_config_dword(i915->gmch.pdev, reg + 4, &temp_hi);
 	pci_read_config_dword(i915->gmch.pdev, reg, &temp_lo);
-	mchbar_addr = ((u64)temp_hi << 32) | temp_lo;
 
 	/* If ACPI doesn't have it, assume we need to allocate it ourselves */
 #ifdef CONFIG_PNP
+	mchbar_addr = ((u64)temp_hi << 32) | temp_lo;
 	if (mchbar_addr &&
 	    pnp_range_reserved(mchbar_addr, mchbar_addr + MCHBAR_SIZE))
 		return 0;
-- 
2.40.0