linux.git/arch/powerpc/mm, branch master

powerpc/mm/radix: Update ERAT flushes when invalidating TLB

2017-02-09T03:54:33+00:00

Three tiny changes to the ERAT flushing logic: First don't make it depend on DD1. It hasn't been decided yet but we might run DD2 in a mode that also requires explicit flushes for performance reasons so make it unconditional. We also add a missing isync, and finally remove the flush from _tlbiel_va as it is only necessary for congruence-class invalidations (PID, LPID and full TLB), not targetted invalidations. Fixes: 96ed1fe511a8 ("powerpc/mm/radix: Invalidate ERAT on tlbiel for POWER9 DD1") Cc: stable@vger.kernel.org # v4.9+ Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Michael Ellerman

powerpc/mm: Fix spurrious segfaults on radix with autonuma

2017-02-08T12:36:29+00:00

When autonuma (Automatic NUMA balancing) marks a PTE inaccessible it clears all the protection bits but leave the PTE valid. With the Radix MMU, an attempt at executing from such a PTE will take a fault with bit 35 of SRR1 set "SRR1_ISI_N_OR_G". It is thus incorrect to treat all such faults as errors. We should pass them to handle_mm_fault() for autonuma to deal with. The case of pages that are really not executable is handled by the existing test for VM_EXEC further down. That leaves us with catching the kernel attempts at executing user pages. We can catch that earlier, even before we do find_vma. It is never valid on powerpc for the kernel to take an exec fault to begin with. So fold that test with the existing test for the kernel faulting on kernel addresses to bail out early. Fixes: 1d18ad026844 ("powerpc/mm: Detect instruction fetch denied and report") Signed-off-by: Benjamin Herrenschmidt Reviewed-by: Aneesh Kumar K.V Acked-by: Balbir Singh Signed-off-by: Michael Ellerman

powerpc/mm: Use the correct pointer when setting a 2MB pte

2017-01-30T04:35:13+00:00

When setting a 2MB pte, radix__map_kernel_page() is using the address ptep = (pte_t *)pudp; Fix this conversion to use pmdp instead. Use pmdp_ptep() to do this instead of casting the pointer. Fixes: 2bfd65e45e87 ("powerpc/mm/radix: Add radix callbacks for early init routines") Cc: stable@vger.kernel.org # v4.7+ Reviewed-by: Aneesh Kumar K.V Signed-off-by: Reza Arbab Signed-off-by: Michael Ellerman

powerpc/mm: Fix little-endian 4K hugetlb

2017-01-18T00:58:50+00:00

When we switched to big endian page table, we never updated the hugepd format such that it can work for both big endian and little endian config. This patch series update hugepd format such that it is looked at as __be64 value in big endian page table config. This patch also switch hugepd_t.pd from signed long to unsigned long. I did update the FSL hugepd_ok check to check for the top bit instead of checking > 0. Fixes: 5dc1ef858c12 ("powerpc/mm: Use big endian Linux page tables for book3s 64") Cc: stable@vger.kernel.org # v4.7+ Signed-off-by: Aneesh Kumar K.V Signed-off-by: Michael Ellerman

powerpc/mm/hugetlb: Don't panic when we don't find the default huge page size

2017-01-18T00:58:50+00:00

The generic hugetlbfs code can handle not finding the default huge page size correctly. With HPAGE_SHIFT = 0 we see in dmesg: hugetlbfs: disabling because there are no supported hugepage sizes bash-4.2# echo 30 > /proc/sys/vm/nr_hugepages bash: echo: write error: Operation not supported Fixes: 03bb2d65900c ("powerpc: get hugetlbpage handling more generic") Reported-by: Chris Smart Signed-off-by: Aneesh Kumar K.V Acked-by: Michael Neuling Signed-off-by: Michael Ellerman

powerpc: Fix pgtable pmd cache init

2017-01-18T00:58:30+00:00

Commit 9b081e10805cd ("powerpc: port 64 bits pgtable_cache to 32 bits") mixed up PMD_INDEX_SIZE and PMD_CACHE_INDEX a couple of times. This resulted in 64s/hash/4k configs to panic at boot with a false positive error check. Fix that and simplify error handling by moving the check to the caller. Fixes: 9b081e10805cd ("powerpc: port 64 bits pgtable_cache to 32 bits") Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman

powerpc/mm: Fix memory hotplug BUG() on radix

2017-01-16T23:05:43+00:00

Memory hotplug is leading to hash page table calls, even on radix: arch_add_memory create_section_mapping htab_bolt_mapping BUG_ON(!ppc_md.hpte_insert); To fix, refactor {create,remove}_section_mapping() into hash__ and radix__ variants. Leave the radix versions stubbed for now. Reviewed-by: Aneesh Kumar K.V Acked-by: Balbir Singh Signed-off-by: Reza Arbab Signed-off-by: Michael Ellerman

Merge branch 'smp-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2016-12-25T22:05:56+00:00

Pull SMP hotplug notifier removal from Thomas Gleixner: "This is the final cleanup of the hotplug notifier infrastructure. The series has been reintgrated in the last two days because there came a new driver using the old infrastructure via the SCSI tree. Summary: - convert the last leftover drivers utilizing notifiers - fixup for a completely broken hotplug user - prevent setup of already used states - removal of the notifiers - treewide cleanup of hotplug state names - consolidation of state space There is a sphinx based documentation pending, but that needs review from the documentation folks" * 'smp-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: irqchip/armada-xp: Consolidate hotplug state space irqchip/gic: Consolidate hotplug state space coresight/etm3/4x: Consolidate hotplug state space cpu/hotplug: Cleanup state names cpu/hotplug: Remove obsolete cpu hotplug register/unregister functions staging/lustre/libcfs: Convert to hotplug state machine scsi/bnx2i: Convert to hotplug state machine scsi/bnx2fc: Convert to hotplug state machine cpu/hotplug: Prevent overwriting of callbacks x86/msr: Remove bogus cleanup from the error path bus: arm-ccn: Prevent hotplug callback leak perf/x86/intel/cstate: Prevent hotplug callback leak ARM/imx/mmcd: Fix broken cpu hotplug handling scsi: qedi: Convert to hotplug state machine

cpu/hotplug: Cleanup state names

2016-12-25T09:47:44+00:00

When the state names got added a script was used to add the extra argument to the calls. The script basically converted the state constant to a string, but the cleanup to convert these strings into meaningful ones did not happen. Replace all the useless strings with 'subsys/xxx/yyy:state' strings which are used in all the other places already. Signed-off-by: Thomas Gleixner Cc: Peter Zijlstra Cc: Sebastian Siewior Link: http://lkml.kernel.org/r/20161221192112.085444152@linutronix.de Signed-off-by: Thomas Gleixner

Replace with globally

2016-12-24T19:46:01+00:00

This was entirely automated, using the script by Al: PATT='^[[:blank:]]*#[[:blank:]]*include[[:blank:]]*' sed -i -e "s!$PATT!#include !" \ $(git grep -l "$PATT"|grep -v ^include/linux/uaccess.h) to do the replacement at the end of the merge window. Requested-by: Al Viro Signed-off-by: Linus Torvalds