linux-kernel - QUestion on x86_64 and i386 for settings of SS segment register

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Message-ID: <CA+ekxPVXJjRzGFtN6_csAgXcsaSwWU_id7JWYbDQ32vjBj5LgA@mail.gmail.com>
Date:	Sat, 24 Oct 2015 15:26:32 -0600
From:	Jeffrey Merkey <jeffmerkey@...il.com>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: QUestion on x86_64 and i386 for settings of SS segment register

I am updating the mdb kernel debugger on 4.2.4 and I noticed that
user_mode_vm has been removed from the kernel sources for detecting
user space memory addresses for purposes of loading the SS pointer.  I
am using __KERNEL_DS presently.

old code:

if (user_mode_vm(regs))
{
    sf->tSS = regs->ss;
    sf->tSP = regs->sp;
} else {
      sf->tSS = __KERNEL_DS;
      sf->tSP = kernel_stack_pointer(regs);
}

is SS always assumed to be __KERNEL_DS in 4.2.4 for userspace stack
addresses passed by pt_regs?

Thanks

Jeff
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