linux-kernel - Re: [RFC] vsprintf: compile error on %09pK

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Message-ID: <20230403121820.GD12892@google.com>
Date:   Mon, 3 Apr 2023 21:18:20 +0900
From:   Sergey Senozhatsky <senozhatsky@...omium.org>
To:     Jaewon Kim <jaewon31.kim@...sung.com>
Cc:     "pmladek@...e.com" <pmladek@...e.com>,
        "senozhatsky@...omium.org" <senozhatsky@...omium.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jaewon31.kim@...il.com" <jaewon31.kim@...il.com>,
        GyeongHwan Hong <gh21.hong@...sung.com>
Subject: Re: [RFC] vsprintf: compile error on %09pK

On (23/04/03 19:46), Jaewon Kim wrote:
> I've just changed %09lx to %09pK on my driver code to hide the address, but I
> faced compiler error. The %9pK without 0 worked.
> 
> Is there restriction on %pK which does now allow %0 ? I've wondered whether I
> did wrong or it is a printk problem.

I don't think this is %pK limitation. %p should not take modification flags.
E.g. %3p doesn't make sense, we still should print the entire pointer.