r8152: Add __GFP_NOWARN to big allocations

When memory is a little tight on my system, it's pretty easy to see
warnings that look like this.

  ksoftirqd/0: page allocation failure: order:3, mode:0x40a20(GFP_ATOMIC|__GFP_COMP), nodemask=(null),cpuset=/,mems_allowed=0
  ...
  Call trace:
   dump_backtrace+0x0/0x1e8
   show_stack+0x20/0x2c
   dump_stack_lvl+0x60/0x78
   dump_stack+0x18/0x38
   warn_alloc+0x104/0x174
   __alloc_pages+0x588/0x67c
   alloc_rx_agg+0xa0/0x190 [r8152 ...]
   r8152_poll+0x270/0x760 [r8152 ...]
   __napi_poll+0x44/0x1ec
   net_rx_action+0x100/0x300
   __do_softirq+0xec/0x38c
   run_ksoftirqd+0x38/0xec
   smpboot_thread_fn+0xb8/0x248
   kthread+0x134/0x154
   ret_from_fork+0x10/0x20

On a fragmented system it's normal that order 3 allocations will
sometimes fail, especially atomic ones. The driver handles these
failures fine and the WARN just creates spam in the logs for this
case. The __GFP_NOWARN flag is exactly for this situation, so add it
to the allocation.

NOTE: my testing is on a 5.15 system, but there should be no reason
that this would be fundamentally different on a mainline kernel.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Hayes Wang <hayeswang@realtek.com>
Link: https://lore.kernel.org/r/20230406171411.1.I84dbef45786af440fd269b71e9436a96a8e7a152@changeid
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/usb/r8152.c

@@ -1943,7 +1943,7 @@ static struct rx_agg *alloc_rx_agg(struct r8152 *tp, gfp_t mflags)
 	if (!rx_agg)
 		return NULL;
 
-	rx_agg->page = alloc_pages(mflags | __GFP_COMP, order);
+	rx_agg->page = alloc_pages(mflags | __GFP_COMP | __GFP_NOWARN, order);
 	if (!rx_agg->page)
 		goto free_rx;