This is a note to let you know that I've just added the patch titled MIPS: smp-cps: Fix retrieval of VPE mask on big endian CPUs to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: mips-smp-cps-fix-retrieval-of-vpe-mask-on-big-endian-cpus.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From foo@baz Thu Oct 5 10:28:31 CEST 2017 From: Matt Redfearn <matt.redfearn@xxxxxxxxxx> Date: Tue, 21 Mar 2017 14:39:19 +0000 Subject: MIPS: smp-cps: Fix retrieval of VPE mask on big endian CPUs From: Matt Redfearn <matt.redfearn@xxxxxxxxxx> [ Upstream commit fb2155e3c30dc2043b52020e26965067a3e7779c ] The vpe_mask member of struct core_boot_config is of type atomic_t, which is a 32bit type. In cps-vec.S this member was being retrieved by a PTR_L macro, which on 64bit systems is a 64bit load. On little endian systems this is OK, since the double word that is retrieved will have the required less significant word in the correct position. However, on big endian systems the less significant word of the load is retrieved from address+4, and the more significant from address+0. The destination register therefore ends up with the required word in the more significant word e.g. when starting the second VP of a big endian 64bit system, the load PTR_L ta2, COREBOOTCFG_VPEMASK(a0) ends up setting register ta2 to 0x0000000300000000 When this value is written to the CPC it is ignored, since it is invalid to write anything larger than 4 bits. This results in any VP other than VP0 in a core failing to start in 64bit big endian systems. Change the load to a 32bit load word instruction to fix the bug. Fixes: f12401d7219f ("MIPS: smp-cps: Pull boot config retrieval out of mips_cps_boot_vpes") Signed-off-by: Matt Redfearn <matt.redfearn@xxxxxxxxxx> Cc: Paul Burton <paul.burton@xxxxxxxxxx> Cc: linux-mips@xxxxxxxxxxxxxx Cc: linux-kernel@xxxxxxxxxxxxxxx Patchwork: https://patchwork.linux-mips.org/patch/15787/ Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/mips/kernel/cps-vec.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/mips/kernel/cps-vec.S +++ b/arch/mips/kernel/cps-vec.S @@ -361,7 +361,7 @@ LEAF(mips_cps_get_bootcfg) END(mips_cps_get_bootcfg) LEAF(mips_cps_boot_vpes) - PTR_L ta2, COREBOOTCFG_VPEMASK(a0) + lw ta2, COREBOOTCFG_VPEMASK(a0) PTR_L ta3, COREBOOTCFG_VPECONFIG(a0) #if defined(CONFIG_CPU_MIPSR6) Patches currently in stable-queue which might be from matt.redfearn@xxxxxxxxxx are queue-4.9/mips-irq-stack-unwind-irq-stack-onto-task-stack.patch queue-4.9/mips-smp-cps-fix-retrieval-of-vpe-mask-on-big-endian-cpus.patch