FAILED: patch "[PATCH] drm/amdkfd: Migrate in CPU page fault use current mm" failed to apply to 5.15-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

Possible dependencies:

3a876060892b ("drm/amdkfd: Migrate in CPU page fault use current mm")
acac270d0982 ("drm/amdkfd: Add migration SMI event")
e0f1e65b836c ("drm/amdkfd: Add GPU recoverable fault SMI event")
9527b9caf82b ("drm/amdkfd: evict svm bo worker handle error")
7ad153db5859 ("drm/amdkfd: handle VMA remove race")
740a451b0797 ("drm/amdkfd: Handle incomplete migration to system memory")
33c6bd989d5e ("drm/amdkfd: debug message to count successfully migrated pages")
75fa98d6e458 ("drm/amdkfd: clarify the origin of cpages returned by migration functions")
ca432dcc27a1 ("drm/amdkfd: handle svm partial migration cpages 0")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 3a876060892ba52dd67d197c78b955e62657d906 Mon Sep 17 00:00:00 2001
From: Philip Yang <Philip.Yang@amd.com>
Date: Thu, 8 Sep 2022 17:56:09 -0400
Subject: [PATCH] drm/amdkfd: Migrate in CPU page fault use current mm

migrate_vma_setup shows below warning because we don't hold another
process mm mmap_lock. We should use current vmf->vma->vm_mm instead, the
caller already hold current mmap lock inside CPU page fault handler.

 WARNING: CPU: 10 PID: 3054 at include/linux/mmap_lock.h:155 find_vma
 Call Trace:
  walk_page_range+0x76/0x150
  migrate_vma_setup+0x18a/0x640
  svm_migrate_vram_to_ram+0x245/0xa10 [amdgpu]
  svm_migrate_to_ram+0x36f/0x470 [amdgpu]
  do_swap_page+0xcfe/0xec0
  __handle_mm_fault+0x96b/0x15e0
  handle_mm_fault+0x13f/0x3e0
  do_user_addr_fault+0x1e7/0x690

Fixes: e1f84eef313f ("drm/amdkfd: handle CPU fault on COW mapping")
Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
index 929dec1da0e4..7522bf2d2f57 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
@@ -949,7 +949,8 @@ static vm_fault_t svm_migrate_to_ram(struct vm_fault *vmf)
 		goto out_unlock_prange;
 	}
 
-	r = svm_migrate_vram_to_ram(prange, mm, KFD_MIGRATE_TRIGGER_PAGEFAULT_CPU);
+	r = svm_migrate_vram_to_ram(prange, vmf->vma->vm_mm,
+				    KFD_MIGRATE_TRIGGER_PAGEFAULT_CPU);
 	if (r)
 		pr_debug("failed %d migrate svms 0x%p range 0x%p [0x%lx 0x%lx]\n",
 			 r, prange->svms, prange, prange->start, prange->last);