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From 369e454ee90ce57ac17c4a1fedef248cab9dfbca Mon Sep 17 00:00:00 2001
From: Felix Kuehling <Felix.Kuehling@amd.com>
Date: Thu, 12 Oct 2017 15:05:52 -0400
Subject: [PATCH 2119/4131] drm/amdkfd: Fix compiler warning
Change-Id: Iaa8fb79ac1accedcc49d416e568ed296c31a6a12
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
---
drivers/gpu/drm/amd/amdkfd/kfd_events.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_events.c b/drivers/gpu/drm/amd/amdkfd/kfd_events.c
index 835e045..69c3728 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_events.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_events.c
@@ -176,8 +176,14 @@ static int create_signal_event(struct file *devkfd,
static int create_other_event(struct kfd_process *p, struct kfd_event *ev)
{
+ /* Cast KFD_LAST_NONSIGNAL_EVENT to uint32_t. This allows an
+ * intentional integer overflow to -1 without a compiler
+ * warning. idr_alloc treats a negative value as "maximum
+ * signed integer".
+ */
int id = idr_alloc(&p->event_idr, ev, KFD_FIRST_NONSIGNAL_EVENT_ID,
- KFD_LAST_NONSIGNAL_EVENT_ID + 1, GFP_KERNEL);
+ (uint32_t)KFD_LAST_NONSIGNAL_EVENT_ID + 1,
+ GFP_KERNEL);
if (id < 0)
return id;
--
2.7.4
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