linux-kernel - [PATCH 6/7] i915: Convert to verify_page

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Date:   Mon, 12 Apr 2021 10:00:18 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     akpm@...ux-foundation.org
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org,
        boris.ostrovsky@...cle.com, jgross@...e.com,
        sstabellini@...nel.org, x86@...nel.org,
        jani.nikula@...ux.intel.com, joonas.lahtinen@...ux.intel.com,
        rodrigo.vivi@...el.com, chris@...is-wilson.co.uk,
        intel-gfx@...ts.freedesktop.org, linux-mm@...ck.org,
        keescook@...omium.org, hch@....de
Subject: [PATCH 6/7] i915: Convert to verify_page_range()

check_{present,absent}() only need R/O access, use verify_page_range()
instead to remove modular use of apply_to_page_range().

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c |   16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c
@@ -1225,9 +1225,9 @@ static int igt_mmap_gpu(void *arg)
 	return 0;
 }
 
-static int check_present_pte(pte_t *pte, unsigned long addr, void *data)
+static int check_present_pte(pte_t pte, unsigned long addr, void *data)
 {
-	if (!pte_present(*pte) || pte_none(*pte)) {
+	if (!pte_present(pte) || pte_none(pte)) {
 		pr_err("missing PTE:%lx\n",
 		       (addr - (unsigned long)data) >> PAGE_SHIFT);
 		return -EINVAL;
@@ -1236,9 +1236,9 @@ static int check_present_pte(pte_t *pte,
 	return 0;
 }
 
-static int check_absent_pte(pte_t *pte, unsigned long addr, void *data)
+static int check_absent_pte(pte_t pte, unsigned long addr, void *data)
 {
-	if (pte_present(*pte) && !pte_none(*pte)) {
+	if (pte_present(pte) && !pte_none(pte)) {
 		pr_err("present PTE:%lx; expected to be revoked\n",
 		       (addr - (unsigned long)data) >> PAGE_SHIFT);
 		return -EINVAL;
@@ -1249,14 +1249,14 @@ static int check_absent_pte(pte_t *pte,
 
 static int check_present(unsigned long addr, unsigned long len)
 {
-	return apply_to_page_range(current->mm, addr, len,
-				   check_present_pte, (void *)addr);
+	return verify_page_range(current->mm, addr, len,
+				 check_present_pte, (void *)addr);
 }
 
 static int check_absent(unsigned long addr, unsigned long len)
 {
-	return apply_to_page_range(current->mm, addr, len,
-				   check_absent_pte, (void *)addr);
+	return verify_page_range(current->mm, addr, len,
+				 check_absent_pte, (void *)addr);
 }
 
 static int prefault_range(u64 start, u64 len)