[PATCH] drm/i915: Call page_address() on page acquired with GFP_KERNEL flag

From: Sumitra Sharma <sumitraartsy@gmail.com>
To: Jani Nikula <jani.nikula@linux.intel.com>,
	Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
	Rodrigo Vivi <rodrigo.vivi@intel.com>,
	Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>,
	David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>,
	intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
	linux-kernel@vger.kernel.org
Cc: Deepak R Varma <drv@mailo.com>, Fabio <fmdefrancesco@gmail.com>,
	Ira Weiny <ira.weiny@intel.com>,
	Sumitra Sharma <sumitraartsy@gmail.com>
Subject: [PATCH] drm/i915: Call page_address() on page acquired with GFP_KERNEL flag
Date: Wed, 14 Jun 2023 05:35:56 -0700	[thread overview]
Message-ID: <20230614123556.GA381200@sumitra.com> (raw)

Pages allocated with GFP_KERNEL cannot come from Highmem.
That is why there is no need to call kmap() on them.

Therefore, don't call kmap() on the page coming from
vma_res->bi.pages using for_each_sgt_page() in
i915_vma_coredump_create().

Use a plain page_address() to get the kernel address instead.

Signed-off-by: Sumitra Sharma <sumitraartsy@gmail.com>
---
 drivers/gpu/drm/i915/i915_gpu_error.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index f020c0086fbc..6f51cb4fc55c 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -1164,9 +1164,8 @@ i915_vma_coredump_create(const struct intel_gt *gt,
 
 			drm_clflush_pages(&page, 1);
 
-			s = kmap(page);
+			s = page_address(page);
 			ret = compress_page(compress, s, dst, false);
-			kunmap(page);
 
 			drm_clflush_pages(&page, 1);
 
-- 
2.25.1

