From: Fenghua Yu <fenghua.yu@intel.com>
To: linux-ia64@vger.kernel.org
Subject: Re: [RFC patch] use thread.on_ustack to determine if on user stack
Date: Mon, 15 Oct 2007 23:26:52 +0000 [thread overview]
Message-ID: <20071015232652.GA32544@linux-os.sc.intel.com> (raw)
In-Reply-To: <3877989d0709290053s7b4e80b6t9e7127b9ccac522b@mail.gmail.com>
On Mon, Oct 15, 2007 at 12:28:05PM +0800, Luming Yu wrote:
> So my problem is I don't know if it is true that pUStk =
> thread.on_ustack in fsys mode. And I didn't locate the code that the
> thread.on_ustack is cleared to 0 during fsys mode.
> So please help.
In fsys call, pUStk is never equal to thread.on_ustack. Here is the code in
fsys_bubble_down() in fsys.S.
....
st1 [r16]=r0 // M2|3 clear current->thread.on_ustack flag
....
cmp.ne pKStk,pUStk=r0,r0 // A set pKStk <- 0, pUStk <- 1
....
The code shows that thread.on_ustack=0 and pUStk=1 during fsys setup phase. The
two should be equal in other cases than fsys. Seems the two similar names cause
confusion.
Thanks.
-Fenghua
next prev parent reply other threads:[~2007-10-15 23:26 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-29 7:53 [RFC patch] use thread.on_ustack to determine if on user stack Luming Yu
2007-10-12 22:15 ` Fenghua Yu
2007-10-15 4:28 ` Luming Yu
2007-10-15 23:26 ` Fenghua Yu [this message]
2007-10-16 1:14 ` Luming Yu
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