linux-kernel - [PATCH 2/6] i915/gvt/kvm: a NULL ->mm does not mean a thread is a kthread

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Date:   Sat,  4 Apr 2020 11:40:57 +0200
From:   Christoph Hellwig <hch@....de>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Al Viro <viro@...iv.linux.org.uk>,
        Felix Kuehling <Felix.Kuehling@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>,
        Zhi Wang <zhi.a.wang@...el.com>,
        Felipe Balbi <balbi@...nel.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>, Jens Axboe <axboe@...nel.dk>,
        linux-kernel@...r.kernel.org, amd-gfx@...ts.freedesktop.org,
        intel-gvt-dev@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org, linux-usb@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        linux-fsdevel@...r.kernel.org, io-uring@...r.kernel.org,
        linux-mm@...ck.org
Subject: [PATCH 2/6] i915/gvt/kvm: a NULL ->mm does not mean a thread is a kthread

Use the proper API instead.

Fixes: f440c8a572d7 ("drm/i915/gvt/kvmgt: read/write GPA via KVM API")
Signed-off-by: Christoph Hellwig <hch@....de>
---
 drivers/gpu/drm/i915/gvt/kvmgt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index 074c4efb58eb..5848400620b4 100644
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -2037,7 +2037,7 @@ static int kvmgt_rw_gpa(unsigned long handle, unsigned long gpa,
 	struct kvmgt_guest_info *info;
 	struct kvm *kvm;
 	int idx, ret;
-	bool kthread = current->mm == NULL;
+	bool kthread = (current->flags & PF_KTHREAD);
 
 	if (!handle_valid(handle))
 		return -ESRCH;
-- 
2.25.1