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From: Jakub Kicinski <kuba@kernel.org>
To: davem@davemloft.net
Cc: netdev@vger.kernel.org, edumazet@google.com, pabeni@redhat.com,
	Jakub Kicinski <kuba@kernel.org>
Subject: [PATCH net-next v2 3/3] eth: tg3: silence the GCC 12 array-bounds warning
Date: Fri, 20 May 2022 12:56:05 -0700	[thread overview]
Message-ID: <20220520195605.2358489-4-kuba@kernel.org> (raw)
In-Reply-To: <20220520195605.2358489-1-kuba@kernel.org>

GCC 12 currently generates a rather inconsistent warning:

drivers/net/ethernet/broadcom/tg3.c:17795:51: warning: array subscript 5 is above array bounds of ‘struct tg3_napi[5]’ [-Warray-bounds]
17795 |                 struct tg3_napi *tnapi = &tp->napi[i];
      |                                           ~~~~~~~~^~~

i is guaranteed < tp->irq_max which in turn is either 1 or 5.
There are more loops like this one in the driver, but strangely
GCC 12 dislikes only this single one.

Silence this silliness for now.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
---
 drivers/net/ethernet/broadcom/Makefile | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/Makefile b/drivers/net/ethernet/broadcom/Makefile
index 0ddfb5b5d53c..2e6c5f258a1f 100644
--- a/drivers/net/ethernet/broadcom/Makefile
+++ b/drivers/net/ethernet/broadcom/Makefile
@@ -17,3 +17,8 @@ obj-$(CONFIG_BGMAC_BCMA) += bgmac-bcma.o bgmac-bcma-mdio.o
 obj-$(CONFIG_BGMAC_PLATFORM) += bgmac-platform.o
 obj-$(CONFIG_SYSTEMPORT) += bcmsysport.o
 obj-$(CONFIG_BNXT) += bnxt/
+
+# FIXME: temporarily silence -Warray-bounds on non W=1+ builds
+ifndef KBUILD_EXTRA_WARN
+CFLAGS_tg3.o += -Wno-array-bounds
+endif
-- 
2.34.3


  parent reply	other threads:[~2022-05-20 19:56 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-20 19:56 [PATCH net-next v2 0/3] eth: silence the GCC 12 array-bounds warnings Jakub Kicinski
2022-05-20 19:56 ` [PATCH net-next v2 1/3] eth: mtk_eth_soc: silence the GCC 12 array-bounds warning Jakub Kicinski
2022-05-20 19:56 ` [PATCH net-next v2 2/3] eth: ice: " Jakub Kicinski
2022-05-20 19:56 ` Jakub Kicinski [this message]
2022-05-22 21:30 ` [PATCH net-next v2 0/3] eth: silence the GCC 12 array-bounds warnings patchwork-bot+netdevbpf

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