From: "David S. Miller" <davem@redhat.com>
To: Manfred Spraul <manfred@colorfullife.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: flush_page_to_ram() question in kernel/ptrace.c
Date: Thu, 8 Mar 2001 13:08:45 -0800 (PST) [thread overview]
Message-ID: <15015.62685.775963.665349@pizda.ninka.net> (raw)
In-Reply-To: <3AA7E4E8.5EACF817@colorfullife.com>
In-Reply-To: <3AA7E4E8.5EACF817@colorfullife.com>
Manfred Spraul writes:
> > memcpy(buf, maddr + (addr & ~PAGE_MASK), len);
> > flush_page_to_ram(page);
> ^^^^^^^^^^^^^^^^^^^^^^
> Is this flush required?
>
> The memcpy read from the mapping, it didn't write.
You have to kick it out of the cache so that future reads on the
kernel side don't get stale data with caching setups that allow
illegal aliases to form.
Later,
David S. Miller
davem@redhat.com
prev parent reply other threads:[~2001-03-08 21:09 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-03-08 20:00 Manfred Spraul
2001-03-08 21:08 ` David S. Miller [this message]
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