[PATCH 1/2] drm/xe: Silence allocation warnings for sync arrays

[Shuicheng Lin <shuicheng.lin@intel.com>]

args->num_syncs comes from userspace and may be large or fuzzed.
When kcalloc() attempts a large allocation, the allocator may emit
warning like below, even though the driver already returns -ENOMEM
safely.

Suppress it by using __GFP_NOWARN when allocating the sync array.

"
WARNING: CPU: 0 PID: 1217 at mm/page_alloc.c:5124 __alloc_frozen_pages_noprof+0x2f8/0x2180 mm/page_alloc.c:5124
...
Call Trace:
 <TASK>
 alloc_pages_mpol+0xe4/0x330 mm/mempolicy.c:2416
 ___kmalloc_large_node+0xd8/0x110 mm/slub.c:4317
 __kmalloc_large_node_noprof+0x18/0xe0 mm/slub.c:4348
 __do_kmalloc_node mm/slub.c:4364 [inline]
 __kmalloc_noprof+0x3d4/0x4b0 mm/slub.c:4388
 kmalloc_noprof include/linux/slab.h:909 [inline]
 kmalloc_array_noprof include/linux/slab.h:948 [inline]
 xe_exec_ioctl+0xa47/0x1e70 drivers/gpu/drm/xe/xe_exec.c:158
 drm_ioctl_kernel+0x1f1/0x3e0 drivers/gpu/drm/drm_ioctl.c:797
 drm_ioctl+0x5e7/0xc50 drivers/gpu/drm/drm_ioctl.c:894
 xe_drm_ioctl+0x10b/0x170 drivers/gpu/drm/xe/xe_device.c:224
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:598 [inline]
 __se_sys_ioctl fs/ioctl.c:584 [inline]
 __x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:584
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xbb/0x380 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
...
"

Reported-by: Koen Koning <koen.koning@intel.com>
Reported-by: Peter Senna Tschudin <peter.senna@linux.intel.com>
Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/6450
Fixes: dd08ebf6c352 ("drm/xe: Introduce a new DRM driver for Intel GPUs")
Cc: <stable@vger.kernel.org> # v6.12+
Cc: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Shuicheng Lin <shuicheng.lin@intel.com>
---
 drivers/gpu/drm/xe/xe_exec.c | 3 ++-
 drivers/gpu/drm/xe/xe_vm.c   | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_exec.c b/drivers/gpu/drm/xe/xe_exec.c
index 4d81210e41f5..7ef78a94e168 100644
--- a/drivers/gpu/drm/xe/xe_exec.c
+++ b/drivers/gpu/drm/xe/xe_exec.c
@@ -162,7 +162,8 @@ int xe_exec_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
 	}
 
 	if (args->num_syncs) {
-		syncs = kcalloc(args->num_syncs, sizeof(*syncs), GFP_KERNEL);
+		syncs = kcalloc(args->num_syncs, sizeof(*syncs),
+				GFP_KERNEL | __GFP_NOWARN);
 		if (!syncs) {
 			err = -ENOMEM;
 			goto err_exec_queue;
diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c
index f9989a7a710c..8cebf7285640 100644
--- a/drivers/gpu/drm/xe/xe_vm.c
+++ b/drivers/gpu/drm/xe/xe_vm.c
@@ -3640,7 +3640,8 @@ int xe_vm_bind_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
 	}
 
 	if (args->num_syncs) {
-		syncs = kcalloc(args->num_syncs, sizeof(*syncs), GFP_KERNEL);
+		syncs = kcalloc(args->num_syncs, sizeof(*syncs),
+				GFP_KERNEL | __GFP_NOWARN);
 		if (!syncs) {
 			err = -ENOMEM;
 			goto put_obj;
-- 
2.49.0