AuxXxilium/linux_dsm_epyc7002
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747a70e60b
linux_dsm_epyc7002/arch/arm64/include/asm
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Steve Capper 747a70e60b arm64: Fix copy-on-write referencing in HugeTLB 
set_pte_at(.) will set or unset the PTE_RDONLY hardware bit before
writing the entry to the table.

This can cause problems with the copy-on-write logic in hugetlb_cow:
 *) hugetlb_cow(.) called to handle a write fault on read only pte,
 *) Before the copy-on-write updates the new page table a call is
    made to pte_same(huge_ptep_get(ptep), pte)), to check for a race,
 *) Because set_pte_at(.) changed the pte, *ptep != pte, and the
    hugetlb_cow(.) code erroneously assumes that it lost the race,
 *) The new page is subsequently freed without being used.

On arm64 this problem only becomes apparent when we apply:
67961f9 mm/hugetlb: fix huge page reserve accounting for private
mappings

When one runs the libhugetlbfs test suite, there are allocation errors
and hugetlbfs pages become erroneously locked in memory as reserved.
(There is a high HugePages_Rsvd: count).

In this patch we introduce pte_same which ignores the PTE_RDONLY bit,
allowing for the libhugetlbfs test suite to pass as expected and
without leaking any reserved HugeTLB pages.

Reported-by: Huang Shijie <shijie.huang@arm.com>
Signed-off-by: Steve Capper <steve.capper@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2016-08-04 13:41:18 +01:00
..
xen xen/events: Support event channel rebind on ARM 2015-08-20 12:24:15 +01:00
acenv.h
acpi.h arm64: kernel: implement ACPI parking protocol 2016-02-16 15:12:32 +00:00
alternative.h arm64: fix "dc cvau" cache operation on errata-affected core 2016-07-01 11:26:20 +01:00
arch_gicv3.h irqchip/gic-v3: Make sure read from ICC_IAR1_EL1 is visible on redestributor 2016-02-11 10:20:02 +00:00
arch_timer.h
arm-cci.h
asm-offsets.h
assembler.h arm64: include alternative handling in dcache_by_line_op 2016-07-01 11:28:16 +01:00
atomic_ll_sc.h arm64: cmpxchg_dbl: fix return value type 2015-11-05 17:29:40 +00:00
atomic_lse.h arm64: lse: deal with clobbered IP registers after branch via PLT 2016-02-26 18:35:02 +00:00
atomic.h arm64 updates for 4.4: 2015-11-04 14:47:13 -08:00
barrier.h arm64: define __smp_xxx 2016-01-12 20:46:53 +02:00
bitops.h
bitrev.h
boot.h arm64: allow kernel Image to be loaded anywhere in physical memory 2016-02-18 18:16:53 +00:00
brk-imm.h arm64: move brk immediate argument definitions to separate header 2016-02-23 17:43:25 +00:00
bug.h arm64: move brk immediate argument definitions to separate header 2016-02-23 17:43:25 +00:00
cache.h arm64: Increase the max granular size 2015-10-28 19:09:17 +00:00
cacheflush.h 2nd set of arm64 updates for 4.6: 2016-03-24 19:13:59 -07:00
cachetype.h arm64: cachetype: fix definitions of ICACHEF_* flags 2015-10-28 18:32:12 +00:00
checksum.h arm64: Implement optimised IP checksum helpers 2016-06-21 15:09:11 +01:00
cmpxchg.h arm64: cmpxchg: Don't incldue linux/mmdebug.h 2015-12-10 17:36:09 +00:00
compat.h arm64: do not include ptrace.h from compat.h 2015-11-17 13:24:36 +00:00
compiler.h
cpu_ops.h
cpu.h arm64: cpuinfo: Expose MIDR_EL1 and REVIDR_EL1 to sysfs 2016-07-12 16:09:37 +01:00
cpufeature.h arm64: errata: Calling enable functions for CPU errata too 2016-07-01 11:30:28 +01:00
cpuidle.h
cputype.h ARM: SoC 64-bit changes for v4.6 2016-03-20 15:08:45 -07:00
dcc.h ARM64: TTY: hvc_dcc: Add support for ARM64 dcc 2015-10-04 17:49:27 +01:00
debug-monitors.h arm64: Kprobes with single stepping support 2016-07-19 15:03:20 +01:00
device.h
dma-mapping.h iommu: of: enforce const-ness of struct iommu_ops 2016-05-09 15:33:29 +02:00
dmi.h
efi.h arm64: efi: always map runtime services code and data regions down to pages 2016-07-01 11:56:26 +01:00
elf.h arm64: Define AT_VECTOR_SIZE_ARCH for ARCH_DLINFO 2016-07-29 10:45:58 +01:00
esr.h arm64: add macro to extract ESR_ELx.EC 2016-06-21 17:07:09 +01:00
exception.h arch, ftrace: for KASAN put hard/soft IRQ entries into separate sections 2016-03-25 16:37:42 -07:00
exec.h
fb.h
fixmap.h arm64: Remove fixmap include fragility 2016-02-26 15:22:53 +00:00
fpsimd.h
fpsimdmacros.h
ftrace.h arm64: Fix misspellings in comments. 2016-03-04 18:19:17 +00:00
futex.h arm64: switch to relative exception tables 2016-02-24 14:57:26 +00:00
hardirq.h arm64: kernel: implement ACPI parking protocol 2016-02-16 15:12:32 +00:00
hugetlb.h arm64: hugetlb: add support for PTE contiguous bit 2015-12-21 17:26:00 +00:00
hw_breakpoint.h arm64: hw_breakpoint: Allow EL2 breakpoints if running in HYP 2016-02-29 18:34:18 +00:00
hwcap.h arm64/HWCAP: Use system wide safe values 2015-10-21 15:35:58 +01:00
hypervisor.h
insn.h arm64: Kprobes with single stepping support 2016-07-19 15:03:20 +01:00
io.h Revert "arm64: ioremap: add ioremap_cache macro" 2015-10-13 16:18:17 +01:00
irq_work.h arm64: force CONFIG_SMP=y and remove redundant #ifdefs 2015-07-27 11:08:40 +01:00
irq.h arm64: remove irq_count and do_softirq_own_stack() 2015-12-21 17:26:01 +00:00
irqflags.h arm64: debug: remove unused local_dbg_{enable, disable} macros 2016-07-19 16:59:40 +01:00
jump_label.h locking/static_keys: Add a new static_key interface 2015-08-03 11:34:15 +02:00
kasan.h arm64: move kernel image to base of vmalloc area 2016-02-18 18:16:44 +00:00
Kbuild arm64: Implement optimised IP checksum helpers 2016-06-21 15:09:11 +01:00
kernel-pgtable.h arm64: choose memstart_addr based on minimum sparsemem section alignment 2016-04-14 16:15:08 +01:00
kexec.h arm64/kexec: Add core kexec support 2016-06-27 16:31:25 +01:00
kgdb.h arm64: kgdb: Match pstate size with gdbserver protocol 2016-06-16 19:20:51 +01:00
kprobes.h arm64: Add trampoline code for kretprobes 2016-07-19 15:03:22 +01:00
kvm_arm.h Small release overall. 2016-05-19 11:27:09 -07:00
kvm_asm.h arm64 updates for 4.7: 2016-05-16 17:17:24 -07:00
kvm_coproc.h
kvm_emulate.h arm64/kvm: use ESR_ELx_EC to extract EC 2016-06-21 17:07:38 +01:00
kvm_host.h - move kvm_stat tool from QEMU repo into tools/kvm/kvm_stat 2016-05-27 13:41:54 -07:00
kvm_hyp.h arm64: perf: Move PMU register related defines to asm/perf_event.h 2016-03-29 16:04:57 +01:00
kvm_mmio.h KVM: arm/arm64: Export mmio_read/write_bus 2016-05-20 15:39:42 +02:00
kvm_mmu.h Small release overall. 2016-05-19 11:27:09 -07:00
kvm_psci.h
linkage.h
lse.h arm64: lse: deal with clobbered IP registers after branch via PLT 2016-02-26 18:35:02 +00:00
memblock.h
memory.h arm64: update stale PAGE_OFFSET comment 2016-06-03 10:16:21 +01:00
mmu_context.h arm64: Ensure the secondary CPUs have safe ASIDBits size 2016-02-25 10:33:06 +00:00
mmu.h arm64: mm: add param to force create_pgd_mapping() to use page mappings 2016-07-01 11:56:26 +01:00
mmzone.h arm64, numa: Add NUMA support for arm64 platforms. 2016-04-15 18:06:09 +01:00
module.h arm64: add support for kernel ASLR 2016-02-24 14:57:27 +00:00
neon.h
numa.h arm64, numa: Add NUMA support for arm64 platforms. 2016-04-15 18:06:09 +01:00
opcodes.h arm64: opcodes.h: Add arm big-endian config options before including arm header 2016-03-29 16:04:57 +01:00
page.h arm64: move {PAGE,CONT}_SHIFT into Kconfig 2016-06-03 10:57:18 +01:00
paravirt.h arm64: introduce CONFIG_PARAVIRT, PARAVIRT_TIME_ACCOUNTING and pv_time_ops 2015-12-21 14:40:54 +00:00
pci.h PCI: Move pci_dma_* helpers to common code 2016-03-07 10:40:02 -06:00
percpu.h arm64: force CONFIG_SMP=y and remove redundant #ifdefs 2015-07-27 11:08:40 +01:00
perf_event.h arm64: perf: Move PMU register related defines to asm/perf_event.h 2016-03-29 16:04:57 +01:00
pgalloc.h arm64: mm: add __{pud,pgd}_populate 2016-02-16 15:10:46 +00:00
pgtable-hwdef.h Small release overall. 2016-05-19 11:27:09 -07:00
pgtable-prot.h arm64: Remove fixmap include fragility 2016-02-26 15:22:53 +00:00
pgtable-types.h arm64: always use STRICT_MM_TYPECHECKS 2016-05-03 09:58:38 +01:00
pgtable.h arm64: Fix copy-on-write referencing in HugeTLB 2016-08-04 13:41:18 +01:00
probes.h arm64: kprobes instruction simulation support 2016-07-19 15:03:21 +01:00
proc-fns.h
processor.h arm64: trap userspace "dc cvau" cache operation on errata-affected core 2016-07-01 11:46:00 +01:00
ptdump.h arm64: mm: dump: make page table dumping reusable 2016-06-21 15:09:11 +01:00
ptrace.h arm64: arm: Fix-up the removal of the arm64 regs_query_register_name() prototype 2016-07-27 08:15:42 +01:00
seccomp.h
shmparam.h arm64: fix COMPAT_SHMLBA definition for large pages 2015-12-02 14:00:10 +00:00
signal32.h
smp_plat.h arm64: remove dead-code depending on CONFIG_UP_LATE_INIT 2015-07-29 18:32:09 +01:00
smp.h arm64: smp: Add function to determine if cpus are stuck in the kernel 2016-06-27 16:24:51 +01:00
sparsemem.h
spinlock_types.h arm64: include linux/types.h in asm/spinlock_types.h 2015-07-27 11:09:34 +01:00
spinlock.h arm64: spinlock: Ensure forward-progress in spin_unlock_wait 2016-06-15 11:23:14 +01:00
stackprotector.h
stacktrace.h arm64: ftrace: fix a stack tracer's output under function graph tracer 2015-12-21 17:26:02 +00:00
stage2_pgtable-nopmd.h kvm: arm64: Get rid of fake page table levels 2016-04-21 14:58:21 +02:00
stage2_pgtable-nopud.h kvm: arm64: Get rid of fake page table levels 2016-04-21 14:58:21 +02:00
stage2_pgtable.h kvm: arm64: Get rid of fake page table levels 2016-04-21 14:58:21 +02:00
stat.h
string.h arm64: add KASAN support 2015-10-12 17:46:36 +01:00
suspend.h arm64: kernel: Add support for hibernate/suspend-to-disk 2016-04-28 13:36:22 +01:00
sync_bitops.h
syscall.h
sysreg.h arm64: trap userspace "dc cvau" cache operation on errata-affected core 2016-07-01 11:46:00 +01:00
system_misc.h arm64: use private ratelimit state along with show_unhandled_signals 2015-06-19 16:26:15 +01:00
thread_info.h arm64: Remove the get_thread_info() function 2016-02-18 17:27:05 +00:00
timex.h
tlb.h arm64: tlbflush: avoid flushing when fullmm == 1 2015-10-07 11:56:21 +01:00
tlbflush.h arm64: tlb: remove redundant barrier from __flush_tlb_pgtable 2015-10-07 11:56:33 +01:00
topology.h arm64, numa: Add NUMA support for arm64 platforms. 2016-04-15 18:06:09 +01:00
traps.h arm64: consolidate signal injection on emulation errors 2016-07-01 11:43:30 +01:00
uaccess.h arm64: kasan: instrument user memory access API 2016-06-21 15:37:18 +01:00
unistd32.h arm64: unistd32.h: wire up missing syscalls for compat tasks 2016-06-01 18:48:20 +01:00
unistd.h arm64: unistd32.h: wire up missing syscalls for compat tasks 2016-06-01 18:48:20 +01:00
vdso_datapage.h arm64: Add support for CLOCK_MONOTONIC_RAW in clock_gettime() vDSO 2016-07-12 16:06:32 +01:00
vdso.h
virt.h arm64: Add back cpu reset routines 2016-06-27 16:31:25 +01:00
word-at-a-time.h arm64: switch to relative exception tables 2016-02-24 14:57:26 +00:00