Re: [PATCH v4 RESEND net-next] net: socket: use BIT() for MSG_*

[Guenter Roeck]

Hi,

On Tue, Mar 09, 2021 at 05:51:35PM -0800, menglong8.dong@xxxxxxxxx wrote:
> From: Menglong Dong <dong.menglong@xxxxxxxxxx>
> 
> The bit mask for MSG_* seems a little confused here. Replace it
> with BIT() to make it clear to understand.
> 
> Signed-off-by: Menglong Dong <dong.menglong@xxxxxxxxxx>

I must admit that I am a bit puzzled, but with this patch in the tree
(in next-20210316) several of my qemu network interface tests fail
to get an IP address. So far I have only seen this with mips64
tests, but that may be because I only started running those tests
on various architectures.

The tests do nothing special: With CONFIG_IP_PNP_DHCP=n, run udhcpc
in qemu to get an IP address. With this patch in place, udhcpc fails.
With this patch reverted, udhcpc gets the IP address as expected.
The error reported by udhcpc is:

udhcpc: sending discover
udhcpc: read error: Invalid argument, reopening socket

Reverting this patch fixes the problem.

Guenter

---
bisect log:

# bad: [0f4b0bb396f6f424a7b074d00cb71f5966edcb8a] Add linux-next specific files for 20210316
# good: [1e28eed17697bcf343c6743f0028cc3b5dd88bf0] Linux 5.12-rc3
git bisect start 'HEAD' 'v5.12-rc3'
# bad: [edd84c42baeffe66740143a04f24588fded94241] Merge remote-tracking branch 'drm-misc/for-linux-next'
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# bad: [0bb3262c0248d44aea3be31076f44beb82a7b120] net: socket: use BIT() for MSG_*
git bisect bad 0bb3262c0248d44aea3be31076f44beb82a7b120
# first bad commit: [0bb3262c0248d44aea3be31076f44beb82a7b120] net: socket: use BIT() for MSG_*