netdev - [PATCH] r8152: Add __GFP_NOWARN to big allocations

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Message-Id: <20230406171411.1.I84dbef45786af440fd269b71e9436a96a8e7a152@changeid>
Date:   Thu,  6 Apr 2023 17:14:26 -0700
From:   Douglas Anderson <dianders@...omium.org>
To:     "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     Douglas Anderson <dianders@...omium.org>,
        André Apitzsch <git@...tzsch.eu>,
        Bjørn Mork <bjorn@...k.no>,
        David Ober <dober6023@...il.com>,
        Hayes Wang <hayeswang@...ltek.com>,
        Jean-Francois Le Fillatre <jflf_kernel@....com>,
        Sven van Ashbrook <svenva@...omium.org>,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        netdev@...r.kernel.org
Subject: [PATCH] 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@...omium.org>
---

 drivers/net/usb/r8152.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index decb5ba56a25..0fc4b959edc1 100644
--- a/drivers/net/usb/r8152.c
+++ b/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;

-- 
2.40.0.577.gac1e443424-goog