From: David Laight <David.Laight@ACULAB.COM>
To: 'xuesong Chen' <xuesong1977@gmail.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: Question about output of kmalloc()
Date: Tue, 14 Jan 2020 10:36:55 +0000 [thread overview]
Message-ID: <22e494d8f2c7448dbf75a70a949d1280@AcuMS.aculab.com> (raw)
In-Reply-To: <CAJKSTDwPX3D956yMaNakgjbHSd7hyyU7YbGN-nM=LmR3qXMtxQ@mail.gmail.com>
From: xuesong Chen
> Sent: 14 January 2020 07:21
> Below code snippet in the .ko:
>
> unsigned long *p = (unsigned long *)kmalloc(sizeof(*p), GFP_KERNEL);
> printk("Addr of p = 0x%p\n", p);
>
> The output is:
> Addr of p = 0x0000000018606ce7
>
> In my mind, during the early day, the p should be 0xfffff...., can
> anybody give some tips why the output looks like it's a physical
> address?
The printed value is hashed to avoid leaking info.
David
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next prev parent reply other threads:[~2020-01-14 10:37 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-14 7:20 xuesong Chen
2020-01-14 10:36 ` David Laight [this message]
2020-01-14 11:50 ` xuesong Chen
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