9b7dbc7dc0
Alpha implements custom SHIFT_PERCPU_PTR for modules because percpu area can be located far away from the 4G area where the module text is located. The custom SHIFT_PERCPU_PTR forces GOT usage using ldq instruction with literal relocation; however, the relocation can't be used with dynamically allocated percpu variables. Fortunately, similar result can be achieved by using weak percpu variable definitions. This patch makes alpha use weak definitions and switch to dynamic percpu allocator. asm/tlbflush.h was getting linux/sched.h via asm/percpu.h which no longer needs it. Include linux/sched.h directly in asm/tlbflush.h. Compile tested. Generation of litereal relocation verified. This patch is based on Ivan Kokshaysky's alpha percpu patch. [ Impact: use dynamic percpu allocator ] Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Richard Henderson <rth@twiddle.net>
153 lines
3.3 KiB
C
153 lines
3.3 KiB
C
#ifndef _ALPHA_TLBFLUSH_H
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#define _ALPHA_TLBFLUSH_H
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#include <linux/mm.h>
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#include <linux/sched.h>
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#include <asm/compiler.h>
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#include <asm/pgalloc.h>
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#ifndef __EXTERN_INLINE
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#define __EXTERN_INLINE extern inline
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#define __MMU_EXTERN_INLINE
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#endif
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extern void __load_new_mm_context(struct mm_struct *);
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/* Use a few helper functions to hide the ugly broken ASN
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numbers on early Alphas (ev4 and ev45). */
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__EXTERN_INLINE void
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ev4_flush_tlb_current(struct mm_struct *mm)
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{
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__load_new_mm_context(mm);
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tbiap();
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}
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__EXTERN_INLINE void
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ev5_flush_tlb_current(struct mm_struct *mm)
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{
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__load_new_mm_context(mm);
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}
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/* Flush just one page in the current TLB set. We need to be very
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careful about the icache here, there is no way to invalidate a
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specific icache page. */
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__EXTERN_INLINE void
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ev4_flush_tlb_current_page(struct mm_struct * mm,
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struct vm_area_struct *vma,
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unsigned long addr)
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{
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int tbi_flag = 2;
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if (vma->vm_flags & VM_EXEC) {
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__load_new_mm_context(mm);
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tbi_flag = 3;
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}
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tbi(tbi_flag, addr);
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}
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__EXTERN_INLINE void
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ev5_flush_tlb_current_page(struct mm_struct * mm,
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struct vm_area_struct *vma,
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unsigned long addr)
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{
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if (vma->vm_flags & VM_EXEC)
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__load_new_mm_context(mm);
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else
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tbi(2, addr);
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}
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#ifdef CONFIG_ALPHA_GENERIC
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# define flush_tlb_current alpha_mv.mv_flush_tlb_current
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# define flush_tlb_current_page alpha_mv.mv_flush_tlb_current_page
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#else
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# ifdef CONFIG_ALPHA_EV4
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# define flush_tlb_current ev4_flush_tlb_current
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# define flush_tlb_current_page ev4_flush_tlb_current_page
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# else
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# define flush_tlb_current ev5_flush_tlb_current
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# define flush_tlb_current_page ev5_flush_tlb_current_page
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# endif
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#endif
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#ifdef __MMU_EXTERN_INLINE
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#undef __EXTERN_INLINE
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#undef __MMU_EXTERN_INLINE
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#endif
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/* Flush current user mapping. */
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static inline void
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flush_tlb(void)
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{
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flush_tlb_current(current->active_mm);
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}
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/* Flush someone else's user mapping. */
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static inline void
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flush_tlb_other(struct mm_struct *mm)
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{
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unsigned long *mmc = &mm->context[smp_processor_id()];
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/* Check it's not zero first to avoid cacheline ping pong
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when possible. */
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if (*mmc) *mmc = 0;
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}
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#ifndef CONFIG_SMP
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/* Flush everything (kernel mapping may also have changed
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due to vmalloc/vfree). */
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static inline void flush_tlb_all(void)
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{
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tbia();
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}
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/* Flush a specified user mapping. */
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static inline void
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flush_tlb_mm(struct mm_struct *mm)
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{
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if (mm == current->active_mm)
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flush_tlb_current(mm);
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else
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flush_tlb_other(mm);
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}
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/* Page-granular tlb flush. */
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static inline void
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flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
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{
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struct mm_struct *mm = vma->vm_mm;
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if (mm == current->active_mm)
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flush_tlb_current_page(mm, vma, addr);
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else
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flush_tlb_other(mm);
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}
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/* Flush a specified range of user mapping. On the Alpha we flush
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the whole user tlb. */
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static inline void
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flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
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unsigned long end)
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{
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flush_tlb_mm(vma->vm_mm);
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}
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#else /* CONFIG_SMP */
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extern void flush_tlb_all(void);
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extern void flush_tlb_mm(struct mm_struct *);
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extern void flush_tlb_page(struct vm_area_struct *, unsigned long);
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extern void flush_tlb_range(struct vm_area_struct *, unsigned long,
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unsigned long);
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#endif /* CONFIG_SMP */
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static inline void flush_tlb_kernel_range(unsigned long start,
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unsigned long end)
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{
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flush_tlb_all();
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}
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#endif /* _ALPHA_TLBFLUSH_H */
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