caf9a82657
Pull x86 PTI preparatory patches from Thomas Gleixner:
"Todays Advent calendar window contains twentyfour easy to digest
patches. The original plan was to have twenty three matching the date,
but a late fixup made that moot.
- Move the cpu_entry_area mapping out of the fixmap into a separate
address space. That's necessary because the fixmap becomes too big
with NRCPUS=8192 and this caused already subtle and hard to
diagnose failures.
The top most patch is fresh from today and cures a brain slip of
that tall grumpy german greybeard, who ignored the intricacies of
32bit wraparounds.
- Limit the number of CPUs on 32bit to 64. That's insane big already,
but at least it's small enough to prevent address space issues with
the cpu_entry_area map, which have been observed and debugged with
the fixmap code
- A few TLB flush fixes in various places plus documentation which of
the TLB functions should be used for what.
- Rename the SYSENTER stack to CPU_ENTRY_AREA stack as it is used for
more than sysenter now and keeping the name makes backtraces
confusing.
- Prevent LDT inheritance on exec() by moving it to arch_dup_mmap(),
which is only invoked on fork().
- Make vysycall more robust.
- A few fixes and cleanups of the debug_pagetables code. Check
PAGE_PRESENT instead of checking the PTE for 0 and a cleanup of the
C89 initialization of the address hint array which already was out
of sync with the index enums.
- Move the ESPFIX init to a different place to prepare for PTI.
- Several code moves with no functional change to make PTI
integration simpler and header files less convoluted.
- Documentation fixes and clarifications"
* 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (24 commits)
x86/cpu_entry_area: Prevent wraparound in setup_cpu_entry_area_ptes() on 32bit
init: Invoke init_espfix_bsp() from mm_init()
x86/cpu_entry_area: Move it out of the fixmap
x86/cpu_entry_area: Move it to a separate unit
x86/mm: Create asm/invpcid.h
x86/mm: Put MMU to hardware ASID translation in one place
x86/mm: Remove hard-coded ASID limit checks
x86/mm: Move the CR3 construction functions to tlbflush.h
x86/mm: Add comments to clarify which TLB-flush functions are supposed to flush what
x86/mm: Remove superfluous barriers
x86/mm: Use __flush_tlb_one() for kernel memory
x86/microcode: Dont abuse the TLB-flush interface
x86/uv: Use the right TLB-flush API
x86/entry: Rename SYSENTER_stack to CPU_ENTRY_AREA_entry_stack
x86/doc: Remove obvious weirdnesses from the x86 MM layout documentation
x86/mm/64: Improve the memory map documentation
x86/ldt: Prevent LDT inheritance on exec
x86/ldt: Rework locking
arch, mm: Allow arch_dup_mmap() to fail
x86/vsyscall/64: Warn and fail vsyscall emulation in NATIVE mode
...
198 lines
6.0 KiB
C
198 lines
6.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_POWERPC_MMU_CONTEXT_H
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#define __ASM_POWERPC_MMU_CONTEXT_H
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#ifdef __KERNEL__
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/sched.h>
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#include <linux/spinlock.h>
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#include <asm/mmu.h>
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#include <asm/cputable.h>
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#include <asm/cputhreads.h>
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/*
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* Most if the context management is out of line
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*/
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extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
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extern void destroy_context(struct mm_struct *mm);
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#ifdef CONFIG_SPAPR_TCE_IOMMU
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struct mm_iommu_table_group_mem_t;
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extern int isolate_lru_page(struct page *page); /* from internal.h */
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extern bool mm_iommu_preregistered(struct mm_struct *mm);
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extern long mm_iommu_get(struct mm_struct *mm,
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unsigned long ua, unsigned long entries,
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struct mm_iommu_table_group_mem_t **pmem);
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extern long mm_iommu_put(struct mm_struct *mm,
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struct mm_iommu_table_group_mem_t *mem);
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extern void mm_iommu_init(struct mm_struct *mm);
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extern void mm_iommu_cleanup(struct mm_struct *mm);
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extern struct mm_iommu_table_group_mem_t *mm_iommu_lookup(struct mm_struct *mm,
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unsigned long ua, unsigned long size);
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extern struct mm_iommu_table_group_mem_t *mm_iommu_lookup_rm(
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struct mm_struct *mm, unsigned long ua, unsigned long size);
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extern struct mm_iommu_table_group_mem_t *mm_iommu_find(struct mm_struct *mm,
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unsigned long ua, unsigned long entries);
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extern long mm_iommu_ua_to_hpa(struct mm_iommu_table_group_mem_t *mem,
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unsigned long ua, unsigned long *hpa);
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extern long mm_iommu_ua_to_hpa_rm(struct mm_iommu_table_group_mem_t *mem,
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unsigned long ua, unsigned long *hpa);
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extern long mm_iommu_mapped_inc(struct mm_iommu_table_group_mem_t *mem);
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extern void mm_iommu_mapped_dec(struct mm_iommu_table_group_mem_t *mem);
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#endif
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extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm);
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extern void set_context(unsigned long id, pgd_t *pgd);
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#ifdef CONFIG_PPC_BOOK3S_64
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extern void radix__switch_mmu_context(struct mm_struct *prev,
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struct mm_struct *next);
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static inline void switch_mmu_context(struct mm_struct *prev,
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struct mm_struct *next,
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struct task_struct *tsk)
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{
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if (radix_enabled())
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return radix__switch_mmu_context(prev, next);
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return switch_slb(tsk, next);
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}
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extern int hash__alloc_context_id(void);
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extern void hash__reserve_context_id(int id);
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extern void __destroy_context(int context_id);
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static inline void mmu_context_init(void) { }
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#else
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extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next,
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struct task_struct *tsk);
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extern unsigned long __init_new_context(void);
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extern void __destroy_context(unsigned long context_id);
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extern void mmu_context_init(void);
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#endif
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#if defined(CONFIG_KVM_BOOK3S_HV_POSSIBLE) && defined(CONFIG_PPC_RADIX_MMU)
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extern void radix_kvm_prefetch_workaround(struct mm_struct *mm);
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#else
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static inline void radix_kvm_prefetch_workaround(struct mm_struct *mm) { }
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#endif
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extern void switch_cop(struct mm_struct *next);
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extern int use_cop(unsigned long acop, struct mm_struct *mm);
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extern void drop_cop(unsigned long acop, struct mm_struct *mm);
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#ifdef CONFIG_PPC_BOOK3S_64
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static inline void inc_mm_active_cpus(struct mm_struct *mm)
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{
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atomic_inc(&mm->context.active_cpus);
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}
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static inline void dec_mm_active_cpus(struct mm_struct *mm)
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{
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atomic_dec(&mm->context.active_cpus);
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}
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static inline void mm_context_add_copro(struct mm_struct *mm)
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{
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/*
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* On hash, should only be called once over the lifetime of
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* the context, as we can't decrement the active cpus count
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* and flush properly for the time being.
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*/
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inc_mm_active_cpus(mm);
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}
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static inline void mm_context_remove_copro(struct mm_struct *mm)
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{
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/*
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* Need to broadcast a global flush of the full mm before
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* decrementing active_cpus count, as the next TLBI may be
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* local and the nMMU and/or PSL need to be cleaned up.
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* Should be rare enough so that it's acceptable.
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*
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* Skip on hash, as we don't know how to do the proper flush
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* for the time being. Invalidations will remain global if
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* used on hash.
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*/
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if (radix_enabled()) {
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flush_all_mm(mm);
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dec_mm_active_cpus(mm);
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}
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}
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#else
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static inline void inc_mm_active_cpus(struct mm_struct *mm) { }
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static inline void dec_mm_active_cpus(struct mm_struct *mm) { }
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static inline void mm_context_add_copro(struct mm_struct *mm) { }
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static inline void mm_context_remove_copro(struct mm_struct *mm) { }
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#endif
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extern void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next,
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struct task_struct *tsk);
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static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
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struct task_struct *tsk)
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{
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unsigned long flags;
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local_irq_save(flags);
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switch_mm_irqs_off(prev, next, tsk);
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local_irq_restore(flags);
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}
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#define switch_mm_irqs_off switch_mm_irqs_off
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#define deactivate_mm(tsk,mm) do { } while (0)
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/*
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* After we have set current->mm to a new value, this activates
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* the context for the new mm so we see the new mappings.
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*/
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static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
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{
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switch_mm(prev, next, current);
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}
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/* We don't currently use enter_lazy_tlb() for anything */
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static inline void enter_lazy_tlb(struct mm_struct *mm,
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struct task_struct *tsk)
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{
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/* 64-bit Book3E keeps track of current PGD in the PACA */
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#ifdef CONFIG_PPC_BOOK3E_64
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get_paca()->pgd = NULL;
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#endif
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}
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static inline int arch_dup_mmap(struct mm_struct *oldmm,
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struct mm_struct *mm)
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{
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return 0;
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}
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#ifndef CONFIG_PPC_BOOK3S_64
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static inline void arch_exit_mmap(struct mm_struct *mm)
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{
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}
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#else
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extern void arch_exit_mmap(struct mm_struct *mm);
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#endif
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static inline void arch_unmap(struct mm_struct *mm,
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struct vm_area_struct *vma,
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unsigned long start, unsigned long end)
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{
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if (start <= mm->context.vdso_base && mm->context.vdso_base < end)
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mm->context.vdso_base = 0;
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}
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static inline void arch_bprm_mm_init(struct mm_struct *mm,
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struct vm_area_struct *vma)
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{
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}
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static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
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bool write, bool execute, bool foreign)
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{
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/* by default, allow everything */
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return true;
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}
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#endif /* __KERNEL__ */
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#endif /* __ASM_POWERPC_MMU_CONTEXT_H */
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