From: Ferruh Yigit <ferruh.yigit@intel.com>
To: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>
Cc: Karra Satwik <kaara.satwik@chelsio.com>,
dev@dpdk.org, Raslan Darawsheh <rasland@mellanox.com>,
Xueming Zhang <xuemingx.zhang@intel.com>
Subject: Re: [dpdk-dev] [PATCH] net/cxgbe: fix build with clang 3.4.2
Date: Wed, 18 Mar 2020 14:48:11 +0000 [thread overview]
Message-ID: <f58c1c62-b2bd-b459-79e5-b97db26dc567@intel.com> (raw)
In-Reply-To: <20200318134805.GA25012@chelsio.com>
On 3/18/2020 1:48 PM, Rahul Lakkireddy wrote:
> On Wednesday, March 03/18/20, 2020 at 12:52:36 +0000, Ferruh Yigit wrote:
>> Build error:
>> .../drivers/net/cxgbe/cxgbe_flow.c:315:2:
>> error: implicit truncation from 'int' to bitfield changes value
>> from -1 to 7 [-Werror,-Wbitfield-constant-conversion]
>> CXGBE_FILL_FS(adap->pf, ~0, pf);
>> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> .../drivers/net/cxgbe/cxgbe_flow.c:25:2:
>> note: expanded from macro 'CXGBE_FILL_FS'
>> __CXGBE_FILL_FS(v, m, fs, elem, e)
>> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> .../drivers/net/cxgbe/cxgbe_flow.c:15:18: note:
>> expanded from macro '__CXGBE_FILL_FS'
>> (fs)->mask.elem = (__m); \
>> ^ ~~~~~
>> Commit in fixes line changes 'PF_BITWIDTH' to '3', which makes 'fs->pf'
>> bitfield size '3', changing '~0' to '0x7' to prevent truncation in
>> assignment.
>>
>> Fixes: dcd456abe46f ("net/cxgbe: support flow API for matching all packets on PF")
>>
>> Reported-by: Raslan Darawsheh <rasland@mellanox.com>
>> Reported-by: Xueming Zhang <xuemingx.zhang@intel.com>
>> Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
>
> I've tested CLANG compilation with 9.0.1 without this patch,
> but couldn't hit the above mentioned error.
>
> # clang --version
> clang version 9.0.1 (Fedora 9.0.1-2.fc31)
>
> However, after grabbing CLANG 3.4.2, I could see the error.
>
> # clang --version
> clang version 3.4.2 (tags/RELEASE_34/dot2-final)
>
> This patch fixes it and the fix is correct too.
>
> Thanks for fixing it.
>
> Acked-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>
Squashed into relevant commit in next-net, thanks.
prev parent reply other threads:[~2020-03-18 14:48 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-18 12:52 Ferruh Yigit
2020-03-18 13:09 ` Ferruh Yigit
2020-03-19 7:31 ` Zhang, XuemingX
2020-03-18 13:48 ` Rahul Lakkireddy
2020-03-18 14:46 ` Raslan Darawsheh
2020-03-18 14:48 ` Ferruh Yigit [this message]
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