linux-kernel - [PATCH] drm/amdkfd: use vma_lookup() instead of find

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Date:   Thu, 20 Oct 2022 04:20:20 -0400
From:   Deming Wang <wangdeming@...pur.com>
To:     <Felix.Kuehling@....com>, <alexander.deucher@....com>,
        <christian.koenig@....com>, <Xinhui.Pan@....com>,
        <airlied@...il.com>, <daniel@...ll.ch>
CC:     <amd-gfx@...ts.freedesktop.org>, <dri-devel@...ts.freedesktop.org>,
        <linux-kernel@...r.kernel.org>, Deming Wang <wangdeming@...pur.com>
Subject: [PATCH] drm/amdkfd: use vma_lookup() instead of find_vma()

Using vma_lookup() verifies the start address is contained in the found
vma.  This results in easier to read the code.

Signed-off-by: Deming Wang <wangdeming@...pur.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_svm.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
index 64fdf63093a0..0100812478b2 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
@@ -1586,8 +1586,8 @@ static int svm_range_validate_and_map(struct mm_struct *mm,
 		unsigned long npages;
 		bool readonly;
 
-		vma = find_vma(mm, addr);
-		if (!vma || addr < vma->vm_start) {
+		vma = vma_lookup(mm, addr);
+		if (!vma) {
 			r = -EFAULT;
 			goto unreserve_out;
 		}
@@ -2542,8 +2542,8 @@ svm_range_get_range_boundaries(struct kfd_process *p, int64_t addr,
 	struct interval_tree_node *node;
 	unsigned long start_limit, end_limit;
 
-	vma = find_vma(p->mm, addr << PAGE_SHIFT);
-	if (!vma || (addr << PAGE_SHIFT) < vma->vm_start) {
+	vma = vma_lookup(p->mm, addr << PAGE_SHIFT);
+	if (!vma) {
 		pr_debug("VMA does not exist in address [0x%llx]\n", addr);
 		return -EFAULT;
 	}
@@ -2871,8 +2871,8 @@ svm_range_restore_pages(struct amdgpu_device *adev, unsigned int pasid,
 	/* __do_munmap removed VMA, return success as we are handling stale
 	 * retry fault.
 	 */
-	vma = find_vma(mm, addr << PAGE_SHIFT);
-	if (!vma || (addr << PAGE_SHIFT) < vma->vm_start) {
+	vma = vma_lookup(mm, addr << PAGE_SHIFT);
+	if (!vma) {
 		pr_debug("address 0x%llx VMA is removed\n", addr);
 		r = 0;
 		goto out_unlock_range;
@@ -3152,9 +3152,8 @@ svm_range_is_valid(struct kfd_process *p, uint64_t start, uint64_t size)
 	start <<= PAGE_SHIFT;
 	end = start + (size << PAGE_SHIFT);
 	do {
-		vma = find_vma(p->mm, start);
-		if (!vma || start < vma->vm_start ||
-		    (vma->vm_flags & device_vma))
+		vma = vma_lookup(p->mm, start);
+		if (!vma || (vma->vm_flags & device_vma))
 			return -EFAULT;
 		start = min(end, vma->vm_end);
 	} while (start < end);
-- 
2.27.0