From: Christoph Hellwig <hch@lst.de>
Date: Thu, 11 Jun 2020 17:34:58 -0700
Subject: amdgpu: a NULL ->mm does not mean a thread is a kthread
Git-commit: 8449d150e66c43fd9bfd77691a56327dfdccedd7
Patch-mainline: v5.8-rc1
References: git-fixes

Use the proper API instead.

Fixes: 70539bd795002 ("drm/amd: Update MEC HQD loading code for KFD")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Tested-by: Jens Axboe <axboe@kernel.dk>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Cc: Zhi Wang <zhi.a.wang@intel.com>
Cc: Felipe Balbi <balbi@kernel.org>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: http://lkml.kernel.org/r/20200404094101.672954-1-hch@lst.de
Link: http://lkml.kernel.org/r/20200404094101.672954-2-hch@lst.de
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
@@ -152,7 +152,7 @@ uint64_t amdgpu_amdkfd_get_vram_usage(st
 		if ((mmptr) && (wptr)) {				\
 			if ((mmptr) == current->mm) {			\
 				valid = !get_user((dst), (wptr));	\
-			} else if (current->mm == NULL) {		\
+			} else if (current->flags & PF_KTHREAD) {	\
 				use_mm(mmptr);				\
 				valid = !get_user((dst), (wptr));	\
 				unuse_mm(mmptr);			\