linux-kernel - [PATCH] drm/i915/mtl: avoid stringop-overflow warning

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Date:   Mon, 16 Oct 2023 22:10:04 +0200
From:   Arnd Bergmann <arnd@...nel.org>
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>,
        Badal Nilawar <badal.nilawar@...el.com>,
        Ashutosh Dixit <ashutosh.dixit@...el.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Matt Roper <matthew.d.roper@...el.com>,
        Vinay Belgaumkar <vinay.belgaumkar@...el.com>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] drm/i915/mtl: avoid stringop-overflow warning

From: Arnd Bergmann <arnd@...db.de>

The newly added memset() causes a warning for some reason I could not figure out:

In file included from arch/x86/include/asm/string.h:3,
                 from drivers/gpu/drm/i915/gt/intel_rc6.c:6:
In function 'rc6_res_reg_init',
    inlined from 'intel_rc6_init' at drivers/gpu/drm/i915/gt/intel_rc6.c:610:2:
arch/x86/include/asm/string_32.h:195:29: error: '__builtin_memset' writing 16 bytes into a region of size 0 overflows the destination [-Werror=stringop-overflow=]
  195 | #define memset(s, c, count) __builtin_memset(s, c, count)
      |                             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/i915/gt/intel_rc6.c:584:9: note: in expansion of macro 'memset'
  584 |         memset(rc6->res_reg, INVALID_MMIO_REG.reg, sizeof(rc6->res_reg));
      |         ^~~~~~
In function 'intel_rc6_init':

Change it to an normal initializer and an added memcpy() that does not have
this problem.

Fixes: 4bb9ca7ee0745 ("drm/i915/mtl: C6 residency and C state type for MTL SAMedia")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/gpu/drm/i915/gt/intel_rc6.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_rc6.c b/drivers/gpu/drm/i915/gt/intel_rc6.c
index 8b67abd720be8..7090e4be29cb6 100644
--- a/drivers/gpu/drm/i915/gt/intel_rc6.c
+++ b/drivers/gpu/drm/i915/gt/intel_rc6.c
@@ -581,19 +581,23 @@ static void __intel_rc6_disable(struct intel_rc6 *rc6)
 
 static void rc6_res_reg_init(struct intel_rc6 *rc6)
 {
-	memset(rc6->res_reg, INVALID_MMIO_REG.reg, sizeof(rc6->res_reg));
+	i915_reg_t res_reg[INTEL_RC6_RES_MAX] = {
+		[0 ... INTEL_RC6_RES_MAX - 1] = INVALID_MMIO_REG,
+	};
 
 	switch (rc6_to_gt(rc6)->type) {
 	case GT_MEDIA:
-		rc6->res_reg[INTEL_RC6_RES_RC6] = MTL_MEDIA_MC6;
+		res_reg[INTEL_RC6_RES_RC6] = MTL_MEDIA_MC6;
 		break;
 	default:
-		rc6->res_reg[INTEL_RC6_RES_RC6_LOCKED] = GEN6_GT_GFX_RC6_LOCKED;
-		rc6->res_reg[INTEL_RC6_RES_RC6] = GEN6_GT_GFX_RC6;
-		rc6->res_reg[INTEL_RC6_RES_RC6p] = GEN6_GT_GFX_RC6p;
-		rc6->res_reg[INTEL_RC6_RES_RC6pp] = GEN6_GT_GFX_RC6pp;
+		res_reg[INTEL_RC6_RES_RC6_LOCKED] = GEN6_GT_GFX_RC6_LOCKED;
+		res_reg[INTEL_RC6_RES_RC6] = GEN6_GT_GFX_RC6;
+		res_reg[INTEL_RC6_RES_RC6p] = GEN6_GT_GFX_RC6p;
+		res_reg[INTEL_RC6_RES_RC6pp] = GEN6_GT_GFX_RC6pp;
 		break;
 	}
+
+	memcpy(rc6->res_reg, res_reg, sizeof(res_reg));
 }
 
 void intel_rc6_init(struct intel_rc6 *rc6)
-- 
2.39.2