mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2025-01-10 07:00:48 +00:00
b0f5a8f32e
This fixes a regression in commit 4d6501dce079 where I didn't notice that MIPS and OpenRISC were reinitialising p->{set,clear}_child_tid to NULL after our initialisation in copy_process(). We can simply get rid of the arch-specific initialisation here since it is now always done in copy_process() before hitting copy_thread{,_tls}(). Review notes: - As far as I can tell, copy_process() is the only user of copy_thread_tls(), which is the only caller of copy_thread() for architectures that don't implement copy_thread_tls(). - After this patch, there is no arch-specific code touching p->set_child_tid or p->clear_child_tid whatsoever. - It may look like MIPS/OpenRISC wanted to always have these fields be NULL, but that's not true, as copy_process() would unconditionally set them again _after_ calling copy_thread_tls() before commit 4d6501dce079. Fixes: 4d6501dce079c1eb6bf0b1d8f528a5e81770109e ("kthread: Fix use-after-free if kthread fork fails") Reported-by: Guenter Roeck <linux@roeck-us.net> Tested-by: Guenter Roeck <linux@roeck-us.net> # MIPS only Acked-by: Stafford Horne <shorne@gmail.com> Acked-by: Oleg Nesterov <oleg@redhat.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: linux-mips@linux-mips.org Cc: Jonas Bonn <jonas@southpole.se> Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi> Cc: openrisc@lists.librecores.org Cc: Jamie Iles <jamie.iles@oracle.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
OpenRISC Linux ============== This is a port of Linux to the OpenRISC class of microprocessors; the initial target architecture, specifically, is the 32-bit OpenRISC 1000 family (or1k). For information about OpenRISC processors and ongoing development: website http://openrisc.io For more information about Linux on OpenRISC, please contact South Pole AB. email: info@southpole.se website: http://southpole.se http://southpoleconsulting.com --------------------------------------------------------------------- Build instructions for OpenRISC toolchain and Linux =================================================== In order to build and run Linux for OpenRISC, you'll need at least a basic toolchain and, perhaps, the architectural simulator. Steps to get these bits in place are outlined here. 1) The toolchain can be obtained from openrisc.io. Instructions for building a toolchain can be found at: https://github.com/openrisc/tutorials 2) or1ksim (optional) or1ksim is the architectural simulator which will allow you to actually run your OpenRISC Linux kernel if you don't have an OpenRISC processor at hand. git clone https://github.com/openrisc/or1ksim.git cd or1ksim ./configure --prefix=$OPENRISC_PREFIX make make install 3) Linux kernel Build the kernel as usual make ARCH=openrisc defconfig make ARCH=openrisc 4) Run in architectural simulator Grab the or1ksim platform configuration file (from the or1ksim source) and together with your freshly built vmlinux, run your kernel with the following incantation: sim -f arch/openrisc/or1ksim.cfg vmlinux --------------------------------------------------------------------- Terminology =========== In the code, the following particles are used on symbols to limit the scope to more or less specific processor implementations: openrisc: the OpenRISC class of processors or1k: the OpenRISC 1000 family of processors or1200: the OpenRISC 1200 processor --------------------------------------------------------------------- History ======== 18. 11. 2003 Matjaz Breskvar (phoenix@bsemi.com) initial port of linux to OpenRISC/or32 architecture. all the core stuff is implemented and seams usable. 08. 12. 2003 Matjaz Breskvar (phoenix@bsemi.com) complete change of TLB miss handling. rewrite of exceptions handling. fully functional sash-3.6 in default initrd. a much improved version with changes all around. 10. 04. 2004 Matjaz Breskvar (phoenix@bsemi.com) alot of bugfixes all over. ethernet support, functional http and telnet servers. running many standard linux apps. 26. 06. 2004 Matjaz Breskvar (phoenix@bsemi.com) port to 2.6.x 30. 11. 2004 Matjaz Breskvar (phoenix@bsemi.com) lots of bugfixes and enhancments. added opencores framebuffer driver. 09. 10. 2010 Jonas Bonn (jonas@southpole.se) major rewrite to bring up to par with upstream Linux 2.6.36