From: bibo,mao <bibo.mao@intel.com>
Date: Tue, 30 Jan 2007 03:02:19 +0000 (+0800)
Subject: [IA64] find thread for user rbs address
X-Git-Tag: v2.6.21-rc1~92^2~36^2~17
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=87f76d3aafe5b5e0a1d6d857088a0263b35afa6b;p=pandora-kernel.git

[IA64] find thread for user rbs address

I encountered one problem when running ptrace test case the situation
is this: traced process's syscall parameter needs to be accessed, but
for sys_clone system call with clone_flag (CLONE_VFORK | CLONE_VM |
SIGCHLD) parameter.  This syscall's parameter accessing result is wrong.

The reason is that vforked child process mm point is the same, but
tgid is different. Without this patch find_thread_for_addr will return
vforked process if vforked process is also stopped, but not the thread
which calls vfork syscall.

Signed-off-by: Tony Luck <tony.luck@intel.com>
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