a1ea1c032b
asm-generic/mm_hooks.h provides some generic fillers for the 90% of architectures that do not need to hook some mmap-manipulation functions. A comment inside says: > Define generic no-op hooks for arch_dup_mmap and > arch_exit_mmap, to be included in asm-FOO/mmu_context.h > for any arch FOO which doesn't need to hook these. So, does x86 need to hook these? It depends on CONFIG_PARAVIRT. We *conditionally* include this generic header if we have CONFIG_PARAVIRT=n. That's madness. With this patch, x86 stops using asm-generic/mmu_hooks.h entirely. We use our own copies of the functions. The paravirt code provides some stubs if it is disabled, and we always call those stubs in our x86-private versions of arch_exit_mmap() and arch_dup_mmap(). Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Cc: Dave Hansen <dave@sr71.net> Cc: x86@kernel.org Link: http://lkml.kernel.org/r/20141118182349.14567FA5@viggo.jf.intel.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
128 lines
3.1 KiB
C
128 lines
3.1 KiB
C
#ifndef _ASM_X86_MMU_CONTEXT_H
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#define _ASM_X86_MMU_CONTEXT_H
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#include <asm/desc.h>
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#include <linux/atomic.h>
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#include <linux/mm_types.h>
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#include <trace/events/tlb.h>
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#include <asm/pgalloc.h>
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#include <asm/tlbflush.h>
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#include <asm/paravirt.h>
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#include <asm/mpx.h>
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#ifndef CONFIG_PARAVIRT
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static inline void paravirt_activate_mm(struct mm_struct *prev,
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struct mm_struct *next)
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{
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}
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#endif /* !CONFIG_PARAVIRT */
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/*
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* Used for LDT copy/destruction.
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*/
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int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
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void destroy_context(struct mm_struct *mm);
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static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
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{
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#ifdef CONFIG_SMP
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if (this_cpu_read(cpu_tlbstate.state) == TLBSTATE_OK)
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this_cpu_write(cpu_tlbstate.state, TLBSTATE_LAZY);
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#endif
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}
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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 cpu = smp_processor_id();
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if (likely(prev != next)) {
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#ifdef CONFIG_SMP
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this_cpu_write(cpu_tlbstate.state, TLBSTATE_OK);
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this_cpu_write(cpu_tlbstate.active_mm, next);
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#endif
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cpumask_set_cpu(cpu, mm_cpumask(next));
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/* Re-load page tables */
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load_cr3(next->pgd);
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trace_tlb_flush(TLB_FLUSH_ON_TASK_SWITCH, TLB_FLUSH_ALL);
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/* Stop flush ipis for the previous mm */
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cpumask_clear_cpu(cpu, mm_cpumask(prev));
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/* Load the LDT, if the LDT is different: */
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if (unlikely(prev->context.ldt != next->context.ldt))
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load_LDT_nolock(&next->context);
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}
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#ifdef CONFIG_SMP
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else {
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this_cpu_write(cpu_tlbstate.state, TLBSTATE_OK);
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BUG_ON(this_cpu_read(cpu_tlbstate.active_mm) != next);
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if (!cpumask_test_cpu(cpu, mm_cpumask(next))) {
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/*
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* On established mms, the mm_cpumask is only changed
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* from irq context, from ptep_clear_flush() while in
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* lazy tlb mode, and here. Irqs are blocked during
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* schedule, protecting us from simultaneous changes.
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*/
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cpumask_set_cpu(cpu, mm_cpumask(next));
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/*
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* We were in lazy tlb mode and leave_mm disabled
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* tlb flush IPI delivery. We must reload CR3
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* to make sure to use no freed page tables.
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*/
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load_cr3(next->pgd);
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trace_tlb_flush(TLB_FLUSH_ON_TASK_SWITCH, TLB_FLUSH_ALL);
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load_LDT_nolock(&next->context);
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}
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}
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#endif
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}
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#define activate_mm(prev, next) \
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do { \
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paravirt_activate_mm((prev), (next)); \
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switch_mm((prev), (next), NULL); \
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} while (0);
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#ifdef CONFIG_X86_32
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#define deactivate_mm(tsk, mm) \
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do { \
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lazy_load_gs(0); \
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} while (0)
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#else
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#define deactivate_mm(tsk, mm) \
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do { \
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load_gs_index(0); \
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loadsegment(fs, 0); \
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} while (0)
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#endif
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static inline void arch_dup_mmap(struct mm_struct *oldmm,
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struct mm_struct *mm)
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{
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paravirt_arch_dup_mmap(oldmm, mm);
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}
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static inline void arch_exit_mmap(struct mm_struct *mm)
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{
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paravirt_arch_exit_mmap(mm);
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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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mpx_mm_init(mm);
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}
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static inline void arch_unmap(struct mm_struct *mm, struct vm_area_struct *vma,
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unsigned long start, unsigned long end)
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{
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mpx_notify_unmap(mm, vma, start, end);
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}
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#endif /* _ASM_X86_MMU_CONTEXT_H */
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