From: Richard Weinberger <richard@nod.at>
Date: Sat, 17 Aug 2013 16:46:00 +0000 (+0200)
Subject: um: Implement probe_kernel_read()
X-Git-Tag: v3.12-rc1~94^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f75b1b1bedfb498cc43a992ce4d7ed8df3b1e770;p=pandora-kernel.git

um: Implement probe_kernel_read()

UML needs it's own probe_kernel_read() to handle kernel
mode faults correctly.
The implementation uses mincore() on the host side to detect
whether a page is owned by the UML kernel process.

This fixes also a possible crash when sysrq-t is used.
Starting with 3.10 sysrq-t calls probe_kernel_read() to
read details from the kernel workers. As kernel worker are
completely async pointers may turn NULL while reading them.

Cc: <stian@nixia.no>
Cc: <tj@kernel.org>
Cc: <stable@vger.kernel.org> # 3.10.x
Signed-off-by: Richard Weinberger <richard@nod.at>
---

Reading git-diff-tree failed