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Message-ID: <20201204175745.1cd433f7@kicinski-fedora-pc1c0hjn.DHCP.thefacebook.com>
Date: Fri, 4 Dec 2020 17:57:45 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Arnd Bergmann <arnd@...nel.org>
Cc: Ayush Sawal <ayush.sawal@...lsio.com>,
Vinay Kumar Yadav <vinay.yadav@...lsio.com>,
Rohit Maheshwari <rohitm@...lsio.com>,
"David S. Miller" <davem@...emloft.net>,
Arnd Bergmann <arnd@...db.de>,
Nathan Chancellor <natechancellor@...il.com>,
Nick Desaulniers <ndesaulniers@...gle.com>,
YueHaibing <yuehaibing@...wei.com>, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: Re: [PATCH] ch_ktls: fix build warning for ipv4-only config
On Thu, 3 Dec 2020 23:26:16 +0100 Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
>
> When CONFIG_IPV6 is disabled, clang complains that a variable
> is uninitialized for non-IPv4 data:
>
> drivers/net/ethernet/chelsio/inline_crypto/ch_ktls/chcr_ktls.c:1046:6: error: variable 'cntrl1' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized]
> if (tx_info->ip_family == AF_INET) {
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/net/ethernet/chelsio/inline_crypto/ch_ktls/chcr_ktls.c:1059:2: note: uninitialized use occurs here
> cntrl1 |= T6_TXPKT_ETHHDR_LEN_V(maclen - ETH_HLEN) |
> ^~~~~~
>
> Replace the preprocessor conditional with the corresponding C version,
> and make the ipv4 case unconditional in this configuration to improve
> readability and avoid the warning.
>
> Fixes: 86716b51d14f ("ch_ktls: Update cheksum information")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
This is for evrey clang build or just W=1+? Would be annoying if clang
produced this on every build with 5.10 (we need to decide fix vs -next).
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