linux-kernel - RE: [PATCH] infiniband hfi1: fix misuse of %x in ipoib

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Message-ID: <CH0PR01MB71536ECA05AA44C4FAD83502F2A29@CH0PR01MB7153.prod.exchangelabs.com>
Date:   Wed, 22 Sep 2021 17:51:08 +0000
From:   "Marciniszyn, Mike" <mike.marciniszyn@...nelisnetworks.com>
To:     Guo Zhi <qtxuning1999@...u.edu.cn>,
        "Dalessandro, Dennis" <dennis.dalessandro@...nelisnetworks.com>,
        "dledford@...hat.com" <dledford@...hat.com>
CC:     "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] infiniband hfi1: fix misuse of %x in ipoib_tx.c

> Subject: [PATCH] infiniband hfi1: fix misuse of %x in ipoib_tx.c
> 
> Pointers should be printed with %p or %px rather than cast to (unsigned long
> long) and printed with %llx.
> Change %llx to %p to print the pointer.
> 
> Signed-off-by: Guo Zhi <qtxuning1999@...u.edu.cn>

The unsigned long long was originally used to insure the entire accurate pointer as emitted.

This is to ensure the pointers in prints and event traces match values in stacks and register dumps.

I think the %p will obfuscate the pointer so %px is correct for our use case.

Mike