Re: [PATCH] tcp: avoid bogus warning in tcp_clean_rtx_queue

From: David Miller
Date: Tue Sep 19 2017 - 18:02:05 EST


From: Arnd Bergmann <arnd@xxxxxxxx>
Date: Tue, 19 Sep 2017 23:32:33 +0200

> On Tue, Sep 19, 2017 at 11:02 PM, David Miller <davem@xxxxxxxxxxxxx> wrote:
>> What cpu did you test the object code generation upon and does that
>> cpu have branch prediction hints in the target you are building for?
>
> This was a randconfig build targetting ARMv5. I'm pretty sure that has
> no such hint instructions.

I just tested on sparc64 and it changed the branch prediction:

.L2157:
- brz,pn %i3, .L1898 ! first_ackt,
+ brz,pt %i2, .L1898 ! first_ackt,
mov -1, %o2 !, seq_rtt_us