From mboxrd@z Thu Jan 1 00:00:00 1970 From: Helge Deller Subject: [GIT PULL] parisc fix for v3.12 Date: Sun, 27 Oct 2013 16:53:40 +0100 Message-ID: <20131027155340.GA30470@p100.box> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii To: Linus Torvalds , linux-kernel@vger.kernel.org, linux-parisc@vger.kernel.org, James Bottomley , John David Anglin Return-path: List-ID: List-Id: linux-parisc.vger.kernel.org Hi Linus, Please pull the one important fix for the parisc architecture from git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux.git parisc-3.12 This is a 2-line patch to save the CPU register which holds our task thread info pointer before calling a firmware function and then to restore it again afterwards. This is necessary because on some 64bit machines the high-order 32bits are being clobbered by the firmware call, and thus we failed to bring up secondary CPUs (and instead crashed the kernel) in some situations e.g. if we had more than 4GB RAM. This patch fixes a bug which has been since ever in the parisc linux kernel and which prevented some people to use a 64bit kernel. Thanks, Helge ---------------------------------------------------------------- Helge Deller (1): parisc: Do not crash 64bit SMP kernels on machines with >= 4GB RAM arch/parisc/kernel/head.S | 4 ++++ 1 file changed, 4 insertions(+)