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video: tegra: nvmap: Avoid double updation of RSS counter

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The RSS counter is updated during buffer allocation as well as mmap,
which is leading to double updation. Fix this by decrementing the RSS
counter during page fault while increment it back during unmap flow.

Bug 5222690

Change-Id: I77972185f20d9d710571cc07ae1c5188060bfa1f
Signed-off-by: Ketan Patil <ketanp@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3442670
(cherry picked from commit 1c59063ce7)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3453103
Reviewed-by: Amulya Yarlagadda <ayarlagadda@nvidia.com>
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
Tested-by: Amulya Yarlagadda <ayarlagadda@nvidia.com>
This commit is contained in:
Ketan Patil
2025-09-02 08:53:30 +00:00
committed by Amulya Yarlagadda
parent e488812038
commit b27a1a79ee
3 changed files with 22 additions and 2 deletions
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3
drivers/video/tegra/nvmap/nvmap_dmabuf.c
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@@ -1,6 +1,6 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2012-2023, NVIDIA CORPORATION. All rights reserved.
* Copyright (c) 2012-2025, NVIDIA CORPORATION. All rights reserved.
*
* dma_buf exporter for nvmap
*/
@@ -450,6 +450,7 @@ int __nvmap_map(struct nvmap_handle *h, struct vm_area_struct *vma)
nvmap_handle_put(h);
return -ENOMEM;
}
mutex_init(&priv->vma_lock);
priv->handle = h;
#if defined(NV_VM_AREA_STRUCT_HAS_CONST_VM_FLAGS) /* Linux v6.3 */