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ca8afd4046
linux_dsm_epyc7002/arch/powerpc/include/asm
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Christophe Leroy ca8afd4046 powerpc/hugetlb: fix page rights verification in gup_hugepte() 
gup_hugepte() checks if pages are present and readable, and
when  'write' is set, also checks if the pages are writable.

Initially this was done by checking if _PAGE_PRESENT and
_PAGE_READ were set. In addition, _PAGE_WRITE was verified for write
accesses.

The problem is that we have to handle the three following cases:
1/ The target defines __PAGE_READ and __PAGE_WRITE
2/ The target defines __PAGE_RW
3/ The target defines __PAGE_RO

In case 1/, this is obvious
In case 2/, __PAGE_READ is defined as 0 and __PAGE_WRITE as __PAGE_RW
so it works as well.
But in case 3, __PAGE_RW is defined as 0, which means __PAGE_WRITE is 0
and then the test returns true (page writable) in all cases.

A first correction was attempted in commit 6b8cb66a6a ("powerpc: Fix
usage of _PAGE_RO in hugepage"), but that fix is wrong:
instead of checking that the page is writable when write is requested,
it checks that the page is NOT writable when write is NOT requested.

This patch adds a new pte_read() helper to check whether a page is
readable or not. This avoids handling all possible cases in
gup_hugepte().

Then gup_hugepte() is modified to use pte_present(), pte_read()
and pte_write() instead of the raw flags.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2017-08-15 22:55:58 +10:00
..
book3s powerpc/hugetlb: fix page rights verification in gup_hugepte() 2017-08-15 22:55:58 +10:00
nohash powerpc/hugetlb: fix page rights verification in gup_hugepte() 2017-08-15 22:55:58 +10:00
8xx_immap.h
accounting.h sched/cputime, powerpc: Prepare accounting structure for cputime flush on tick 2017-01-14 09:54:12 +01:00
agp.h
archrandom.h powerpc: Use hardware RNG for arch_get_random_seed_* not arch_get_random_* 2015-07-23 19:52:03 +10:00
asm-compat.h powerpc/ebpf/jit: Implement JIT compiler for extended BPF 2016-06-24 15:17:57 +10:00
asm-offsets.h
asm-prototypes.h powerpc: Fix missing CRCs, add more asm-prototypes.h declarations 2017-03-21 22:09:26 +11:00
async_tx.h
atomic.h powerpc/64: Fix atomic64_inc_not_zero() to return an int 2017-07-12 21:49:55 +10:00
backlight.h
barrier.h powerpc/64: Drop explicit hwsync in context switch 2017-06-15 16:34:39 +10:00
bitops.h powerpc: Remove __ilog2()s and use generic ones 2017-06-02 19:23:56 +10:00
bootx.h
btext.h
bug.h debug: Fix WARN_ON_ONCE() for modules 2017-07-20 12:31:04 +02:00
bugs.h
cache.h powerpc/8xx: Getting rid of remaining use of CONFIG_8xx 2017-08-10 23:32:12 +10:00
cacheflush.h powerpc: Move cpu_has_feature() to a separate file 2016-08-01 11:15:03 +10:00
cell-pmu.h
cell-regs.h
checksum.h powerpc/64: Fix checksum folding in csum_add() 2017-03-04 23:07:17 +11:00
cmpxchg.h powerpc: Fix __cmpxchg() to take a volatile ptr again 2016-11-25 14:07:50 +11:00
code-patching.h powerpc64/elfv1: Only dereference function descriptor for non-text symbols 2017-07-03 23:08:50 +10:00
compat.h take compat_sys_old_getrlimit() to native syscall 2017-05-27 15:38:06 -04:00
context_tracking.h
copro.h powerpc/cell: Make spu_flush_all_slbs() generic 2014-10-08 20:15:37 +11:00
cpm1.h powerpc/8xx: Adding support of IRQ in MPC8xx GPIO 2017-05-02 22:35:00 -05:00
cpm2.h
cpm.h QE: Move QE from arch/powerpc to drivers/soc 2015-12-22 17:12:56 -06:00
cpu_has_feature.h powerpc/64s: Support new device tree binding for discovering CPU features 2017-05-09 23:42:55 +10:00
cpufeature.h powerpc: Add module autoloading based on CPU features 2016-07-21 20:33:57 +10:00
cpuidle.h powerpc/powernv: Save/Restore additional SPRs for stop4 cpuidle 2017-08-01 21:01:20 +10:00
cputable.h powerpc/8xx: Getting rid of remaining use of CONFIG_8xx 2017-08-10 23:32:12 +10:00
cputhreads.h powerpc: cputhreads: Add missing include file 2016-08-22 11:09:33 +10:00
cputime.h sched/cputime: Remove generic asm headers 2017-02-01 09:14:07 +01:00
current.h
dbdma.h powerpc: Move Power Macintosh drivers to generic byteswappers 2015-03-23 14:29:40 +11:00
dbell.h powerpc/64s: msgclr when handling doorbell exceptions from system reset 2017-06-19 19:46:27 +10:00
dcr-generic.h
dcr-mmio.h
dcr-native.h powerpc: Move cpu_has_feature() to a separate file 2016-08-01 11:15:03 +10:00
dcr-regs.h
dcr.h
debug.h powerpc: Create asm/debugfs.h and move powerpc_debugfs_root there 2017-04-11 07:46:03 +10:00
debugfs.h powerpc: Create asm/debugfs.h and move powerpc_debugfs_root there 2017-04-11 07:46:03 +10:00
delay.h powerpc: use spin loop primitives in some functions 2017-07-02 20:40:24 +10:00
device.h treewide: Move dma_ops from struct dev_archdata into struct device 2017-01-24 12:23:35 -05:00
disassemble.h KVM: PPC: Book3S: Add MMIO emulation for FP and VSX instructions 2017-04-20 11:36:41 +10:00
dma-mapping.h powerpc: merge __dma_set_mask into dma_set_mask 2017-06-28 06:54:55 -07:00
dma.h
dt_cpu_ftrs.h powerpc/64s: Support new device tree binding for discovering CPU features 2017-05-09 23:42:55 +10:00
edac.h EDAC: Cleanup atomic_scrub mess 2015-05-28 15:31:53 +02:00
eeh_event.h
eeh.h powerpc/pci: Delay populating pdn 2016-06-21 15:30:56 +10:00
ehv_pic.h
elf.h powerpc: move ELF_ET_DYN_BASE to 4GB / 4MB 2017-07-10 16:32:36 -07:00
emergency-restart.h
emulated_ops.h
epapr_hcalls.h
exception-64e.h powerpc/e6500: hw tablewalk: make sure we invalidate and write to the same tlb entry 2015-10-27 18:14:40 -05:00
exception-64s.h powerpc/64s/paca: EX_CTR is not used with RELOCATABLE=n, remove it 2017-06-20 22:22:02 +10:00
exec.h
extable.h powerpc: switch to extable.h 2017-03-28 18:23:54 -04:00
fadump.h powerpc/fadump: avoid holes in boot memory area when fadump is registered 2017-06-28 13:08:09 +10:00
fb.h
feature-fixups.h powerpc/64s: Simplify POWER9 DD1 idle workaround code 2017-04-23 20:32:23 +10:00
firmware.h powerpc/pseries: Add hypercall wrappers for hash page table resizing 2017-02-09 21:45:48 +11:00
fixmap.h powerpc/mm: Simplify __set_fixmap() 2017-08-15 22:55:58 +10:00
floppy.h
fs_pd.h powerpc/8xx: Getting rid of remaining use of CONFIG_8xx 2017-08-10 23:32:12 +10:00
fsl_85xx_cache_sram.h
fsl_gtm.h
fsl_hcalls.h scripts/spelling.txt: add "partiton" pattern and fix typo instances 2017-02-27 18:43:46 -08:00
fsl_lbc.h uio: uio_fsl_elbc_gpcm: new driver 2015-01-12 05:04:13 -08:00
fsl_pamu_stash.h iommu/fsl: Various cleanups 2015-02-03 18:47:18 +01:00
fsl_pm.h powerpc/rcpm: add RCPM driver 2016-03-04 23:50:27 -06:00
ftrace.h powerpc: Define and use PPC64_ELF_ABI_v2/v1 2016-06-14 13:58:27 +10:00
futex.h powerpc: EX_TABLE macro for exception tables 2016-11-14 11:11:51 +11:00
grackle.h
hardirq.h powerpc: Add irq accounting for watchdog interrupts 2017-08-10 22:30:02 +10:00
head-64.h powerpc/64s: Add EX_SIZE definition for paca exception save areas 2017-06-20 22:22:00 +10:00
heathrow.h
highmem.h kmap_atomic_to_page() has no users, remove it 2015-11-09 15:11:24 -08:00
hmi.h powerpc: move hmi.c to arch/powerpc/kvm/ 2016-09-09 16:18:07 +10:00
hugetlb.h powerpc/mm: Fix little-endian 4K hugetlb 2017-01-18 11:58:50 +11:00
hvcall.h ibmvnic: Client-initiated failover 2017-06-13 12:53:35 -04:00
hvconsole.h
hvcserver.h
hvsi.h
hw_breakpoint.h
hw_irq.h powerpc/64s/idle: Process interrupts from system reset wakeup 2017-06-19 19:46:27 +10:00
hydra.h powerpc: Fix misspellings in comments. 2016-03-01 19:27:20 +11:00
i8259.h
ibmebus.h
icswx.h crypto: nx-842 - Mask XERS0 bit in return value 2015-12-17 16:42:12 +08:00
ide.h
ima.h powerpc: ima: send the kexec buffer to the next kernel 2016-12-20 09:48:44 -08:00
imc-pmu.h powerpc/powernv: Detect and create IMC device 2017-07-25 22:55:27 +10:00
immap_cpm2.h
io_event_irq.h
io-defs.h
io-workarounds.h
io.h powerpc/mm: Wire up ioremap_cache() 2017-04-21 21:08:47 +10:00
iommu.h powerpc: implement ->mapping_error 2017-06-28 06:54:33 -07:00
ipic.h
irq_work.h powerpc: Re-enable dynticks 2015-02-23 14:52:04 +11:00
irq.h powerpc: Remove stale function prototypes 2014-09-25 23:14:43 +10:00
irqflags.h
isa-bridge.h powerpc: Add support for non-PCI ISA bridges 2017-01-31 13:54:17 +11:00
jump_label.h powerpc updates for 4.8 #2 2016-08-05 09:00:54 -04:00
Kbuild powerpc: allow compiling with GENERIC_MSI_IRQ_DOMAIN 2017-07-24 21:19:32 +10:00
kdebug.h
kdump.h
kexec.h powerpc: ima: send the kexec buffer to the next kernel 2016-12-20 09:48:44 -08:00
keylargo.h
kgdb.h
kmap_types.h
kprobes.h powerpc/kprobes: Skip livepatch_handler() for jprobes 2017-06-16 19:49:43 +10:00
kvm_asm.h KVM: PPC: Book3S HV: Enable hypervisor virtualization interrupts while in guest 2016-11-24 09:24:23 +11:00
kvm_book3s_32.h
kvm_book3s_64.h powerpc/pseries: Skip using reserved virtual address range 2017-04-01 21:12:27 +11:00
kvm_book3s_asm.h KVM: PPC: Book3S HV: Simplify dynamic micro-threading code 2017-07-01 18:59:01 +10:00
kvm_book3s.h KVM: PPC: Book3S HV: Simplify dynamic micro-threading code 2017-07-01 18:59:01 +10:00
kvm_booke_hv_asm.h
kvm_booke.h KVM: PPC: Book3S: correct width in XER handling 2015-08-22 11:16:19 +02:00
kvm_fpu.h
kvm_host.h Merge branch 'kvm-ppc-next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc into HEAD 2017-07-03 10:41:59 +02:00
kvm_para.h
kvm_ppc.h KVM: PPC: Book3S HV: Allow userspace to set the desired SMT mode 2017-06-19 14:34:20 +10:00
libata-portmap.h libata: remove unused definitions from <asm/libata-portmap.h> 2016-09-22 11:50:19 -04:00
linkage.h powerpc: Define and use PPC64_ELF_ABI_v2/v1 2016-06-14 13:58:27 +10:00
livepatch.h powerpc/livepatch: Remove klp_write_module_reloc() stub 2016-12-19 11:15:25 +01:00
local.h
lppaca.h
lv1call.h
machdep.h powerpc/64s/idle: Move soft interrupt mask logic into C code 2017-06-19 19:46:26 +10:00
macio.h
mc146818rtc.h
mce.h powerpc/64s: Machine check handle ifetch from foreign real address for POWER9 2017-06-06 21:17:15 +10:00
mediabay.h
mm-arch-hooks.h powerpc/mm: tracking vDSO remap 2015-06-24 17:49:41 -07:00
mman.h powerpc updates for 4.8 #2 2016-08-05 09:00:54 -04:00
mmu_context.h powerpc: Remove old unused icswx based coprocessor support 2017-08-03 16:06:52 +10:00
mmu-8xx.h powerpc/8xx: Implement support of hugepages 2016-12-09 22:49:07 -06:00
mmu-40x.h
mmu-44x.h
mmu-book3e.h powerpc/mm/nohash: MM_SLICE is only used by book3s 64 2017-03-31 23:09:47 +11:00
mmu.h powerpc/mm/hash: Support 68 bit VA 2017-03-31 23:10:00 +11:00
mmzone.h powerpc: implement arch_reserved_kernel_pages 2016-10-07 18:46:28 -07:00
module.h powerpc/modules: If mprofile-kernel is enabled add it to vermagic 2017-05-15 19:31:38 +10:00
mpc5xxx.h
mpc6xx.h
mpc52xx_psc.h powerpc: mpc512x: drop bogus and unused psc register bit definitions 2015-10-22 16:06:08 +02:00
mpc52xx.h powerpc: Make ppc_md.{halt, restart} __noreturn 2016-07-14 21:12:06 +10:00
mpc85xx.h powerpc/fsl-booke: Add T4080 SVR value 2015-03-31 22:23:17 -05:00
mpc5121.h powerpc/512x: add LocalPlus Bus FIFO device driver 2015-10-22 15:19:40 +02:00
mpc8260.h
mpic_msgr.h powerpc: Remove all usages of NO_IRQ 2016-09-20 20:57:12 +10:00
mpic_timer.h
mpic.h powerpc/mpic: Add get_version API both for internal and external use 2015-03-23 19:51:17 -05:00
msi_bitmap.h powerpc/msi: Free the bitmap if it was slab allocated 2015-10-05 21:32:50 +11:00
nmi.h powerpc/64s: implement arch-specific hardlockup watchdog 2017-07-12 16:26:02 -07:00
nvram.h powerpc/nvram: Move generic code for nvram and pstore 2015-03-23 14:05:49 +11:00
ohare.h
opal-api.h powerpc/powernv: Add support to clear sensor groups data 2017-08-10 22:40:05 +10:00
opal.h powerpc/powernv: Add support to clear sensor groups data 2017-08-10 22:40:05 +10:00
oprofile_impl.h
paca.h powerpc/powernv: Save/Restore additional SPRs for stop4 cpuidle 2017-08-01 21:01:20 +10:00
page_32.h powerpc32: Remove clear_pages() and define clear_page() inline 2016-03-11 17:20:11 -06:00
page_64.h powerpc/mm/slice: Move slice_mask struct definition to slice.c 2017-03-31 23:09:56 +11:00
page.h powerpc/mm: Fix virt_addr_valid() etc. on 64-bit hash 2017-05-19 13:04:35 +10:00
parport.h powerpc: Remove all usages of NO_IRQ 2016-09-20 20:57:12 +10:00
pasemi_dma.h
pci-bridge.h powerpc: Move isa bridge definitions to separate include 2017-01-31 13:54:17 +11:00
pci.h PCI: Add arch_can_pci_mmap_io() on architectures which can mmap() I/O space 2017-04-18 13:02:26 -05:00
percpu.h
perf_event_fsl_emb.h
perf_event_server.h powerpc/perf: Support to export MMCRA[TEC*] field to userspace 2017-04-19 20:00:22 +10:00
perf_event.h powerpc: Rename __get_SP() to current_stack_pointer() 2014-10-15 11:23:20 +11:00
pgalloc.h powerpc/mm/nohash: Move definition of PGALLOC_GFP to fix build errors 2017-08-15 20:02:56 +10:00
pgtable-be-types.h powerpc/mm: Fix little-endian 4K hugetlb 2017-01-18 11:58:50 +11:00
pgtable-types.h powerpc/mm: Fix little-endian 4K hugetlb 2017-01-18 11:58:50 +11:00
pgtable.h powerpc/mm: Fix kernel RAM protection after freeing unused memory on PPC32 2017-08-15 22:55:56 +10:00
plpar_wrappers.h powerpc/pseries: Add hypercall wrappers for hash page table resizing 2017-02-09 21:45:48 +11:00
pmac_feature.h powerpc: Various typo fixes 2016-06-14 13:58:26 +10:00
pmac_low_i2c.h
pmac_pfunc.h
pmc.h
pmi.h
pnv-pci.h powerpc/powernv: Enable PCI peer-to-peer 2017-08-08 11:27:30 +10:00
powernv.h powerpc/powernv: Introduce address translation services for Nvlink2 2017-04-04 13:27:26 +10:00
ppc4xx_ocm.h
ppc4xx.h powerpc: Make ppc_md.{halt, restart} __noreturn 2016-07-14 21:12:06 +10:00
ppc_asm.h powerpc/8xx: Getting rid of remaining use of CONFIG_8xx 2017-08-10 23:32:12 +10:00
ppc-opcode.h powerpc/powernv: Use darn instruction for get_random_seed() on Power9 2017-08-08 19:37:03 +10:00
ppc-pci.h powerpc/eeh: Refactor EEH PE reset functions 2016-11-22 11:57:08 +11:00
probes.h
processor.h powerpc updates for 4.13 2017-07-07 13:55:45 -07:00
prom.h powerpc: Update to new option-vector-5 format for CAS 2017-03-06 21:44:09 +11:00
ps3.h treewide: Consolidate get_dma_ops() implementations 2017-01-24 12:23:35 -05:00
ps3av.h powerpc: Various typo fixes 2016-06-14 13:58:26 +10:00
ps3gpu.h
ps3stor.h
pte-common.h powerpc: Various typo fixes 2016-06-14 13:58:26 +10:00
ptrace.h powerpc: Define and use PPC64_ELF_ABI_v2/v1 2016-06-14 13:58:27 +10:00
reg_8xx.h powerpc/8xx: Perf events on PPC 8xx 2017-01-26 17:49:34 -06:00
reg_a2.h
reg_booke.h powerpc: Remove old unused icswx based coprocessor support 2017-08-03 16:06:52 +10:00
reg_fsl_emb.h
reg.h powerpc/8xx: Use symbolic PVR value 2017-08-10 23:32:18 +10:00
rheap.h
rio.h powerpc: Remove stale function prototypes 2014-09-25 23:14:43 +10:00
rtas.h powerpc/pseries: Implement indexed-count hotplug memory add 2017-02-17 17:57:30 +11:00
runlatch.h
scom.h
seccomp.h powerpc: switch to using asm-generic for seccomp.h 2015-04-17 09:04:10 -04:00
sections.h powerpc/kprobes: Blacklist exception handlers 2017-04-23 20:32:25 +10:00
serial.h
setjmp.h
setup.h powerpc: Put exception configuration in a common place 2016-07-21 18:56:31 +10:00
sfp-machine.h
shmparam.h
signal.h powerpc: signals: Stop using current in signal code 2016-10-04 16:43:07 +11:00
smp.h powerpc/64s: implement arch-specific hardlockup watchdog 2017-07-12 16:26:02 -07:00
smu.h powerpc/pmac: Remove early allocation of the SMU command buffer 2016-07-21 18:56:38 +10:00
sparsemem.h powerpc/mm: Fix build break with BOOK3S_64=n and MEMORY_HOTPLUG=y 2017-02-15 19:58:39 +11:00
spinlock_types.h
spinlock.h locking/core, powerpc: Implement vcpu_is_preempted(cpu) 2016-11-22 12:48:06 +01:00
spu_csa.h powerpc/cell: Drop support for 64K local store on 4K kernels 2015-08-18 19:29:49 +10:00
spu_info.h
spu_priv1.h
spu.h powerpc/cell: Move spu_handle_mm_fault() out of cell platform 2014-10-08 20:14:54 +11:00
sstep.h powerpc: Emulate icbi, mcrf and conditional-trap instructions 2014-09-25 23:14:51 +10:00
string.h powerpc: Remove assembly versions of strcpy, strcat, strlen and strcmp 2016-06-14 13:58:25 +10:00
swab.h powerpc: Remove unused st_le*() and ld_le* functions 2015-03-24 13:33:52 +11:00
swiotlb.h treewide: Constify most dma_map_ops structures 2017-01-24 12:23:35 -05:00
switch_to.h powerpc/ptrace: Fix coredump since ptrace TM changes 2016-08-10 16:34:20 +10:00
synch.h powerpc: Factor do_feature_fixup calls 2016-07-21 18:51:42 +10:00
syscall.h powerpc: Change syscall_get_nr() to return int 2015-07-29 11:56:13 +10:00
syscalls.h powerpc/tracing: Allow tracing of mmap syscalls 2017-04-12 22:32:43 +10:00
systbl.h powerpc: Wire up statx() syscall 2017-03-16 20:45:53 +11:00
tce.h powerpc/powernv/pci: Remove SWINV constants and obsolete TCE code 2016-07-17 16:42:47 +10:00
termios.h
thread_info.h powerpc updates for 4.12 part 1. 2017-05-05 11:36:44 -07:00
time.h powerpc: Move cpu_has_feature() to a separate file 2016-08-01 11:15:03 +10:00
timex.h powerpc/8xx: Getting rid of remaining use of CONFIG_8xx 2017-08-10 23:32:12 +10:00
tlb.h mm: add tlb_remove_check_page_size_change to track page size change 2016-12-12 18:55:07 -08:00
tlbflush.h powerpc/mm: remove flush_tlb_page_nohash 2016-08-01 11:15:13 +10:00
tm.h powerpc: Remove do_load_up_transact_{fpu,altivec} 2016-10-04 20:33:16 +11:00
topology.h Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-07-03 18:08:06 -07:00
trace_clock.h powerpc/ftrace: add powerpc timebase as a trace clock source 2015-08-06 16:36:23 +10:00
trace.h powerpc/mm: Trace tlbie(l) instructions 2017-06-23 21:14:49 +10:00
tsi108_irq.h
tsi108_pci.h genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
tsi108.h powerpc: Various typo fixes 2016-06-14 13:58:26 +10:00
types.h powerpc: Define and use PPC64_ELF_ABI_v2/v1 2016-06-14 13:58:27 +10:00
uaccess.h Merge branch 'work.uaccess-unaligned' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2017-07-15 11:17:52 -07:00
udbg.h powerpc: Remove stale function prototypes 2014-09-25 23:14:43 +10:00
uic.h
unaligned.h
uninorth.h powerpc: Fix misspellings in comments. 2016-03-01 19:27:20 +11:00
unistd.h powerpc: Wire up statx() syscall 2017-03-16 20:45:53 +11:00
uprobes.h
user.h
vdso_datapage.h powerpc: Standardise on NR_syscalls rather than __NR_syscalls. 2015-11-26 22:11:17 +11:00
vdso.h
vga.h powerpc: Move Power Macintosh drivers to generic byteswappers 2015-03-23 14:29:40 +11:00
vio.h remove <asm/scatterlist.h> 2015-05-05 13:35:39 -06:00
word-at-a-time.h powerpc: EX_TABLE macro for exception tables 2016-11-14 11:11:51 +11:00
xics.h powerpc: Change the doorbell IPI calling convention 2017-04-13 23:34:33 +10:00
xilinx_intc.h powerpc/virtex: Use generic xilinx irqchip driver 2016-11-29 09:14:50 +00:00
xilinx_pci.h
xive-regs.h powerpc/xive: Native exploitation of the XIVE interrupt controller 2017-04-10 21:41:34 +10:00
xive.h powerpc/xive: Fix offset for store EOI MMIOs 2017-06-15 23:29:39 +10:00
xmon.h powerpc/xive: Native exploitation of the XIVE interrupt controller 2017-04-10 21:41:34 +10:00
xor.h powerpc: Move cpu_has_feature() to a separate file 2016-08-01 11:15:03 +10:00