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Commit a37102dc authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'parisc-4.9-5' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux 

Pull parisc fixes from Helge Deller:
 "Three important fixes for the parisc architecture.

  Dave provided two patches: One which purges the TLB before setting a
  PTE entry and a second one which drops unnecessary TLB flushes. Both
  patches have been tested for one week on the debian buildd servers and
  prevent random segmentation faults.

  The patch from me fixes a crash at boot inside the TLB measuring code
  on SMP machines with PA8000-PA8700 CPUs (specifically A500-44 and
  J5000 servers)"

* 'parisc-4.9-5' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
  parisc: Fix TLB related boot crash on SMP machines
  parisc: Remove unnecessary TLB purges from flush_dcache_page_asm and flush_icache_page_asm
  parisc: Purge TLB before setting PTE
parents b4aafe77 24d0492b

arch/parisc/include/asm/pgtable.h

+4 −4
Original line number Diff line number Diff line
@@ -65,9 +65,9 @@ static inline void purge_tlb_entries(struct mm_struct *mm, unsigned long addr) 
		unsigned long flags;				\

		spin_lock_irqsave(&pa_tlb_lock, flags);		\

		old_pte = *ptep;				\

		set_pte(ptep, pteval);				\

		if (pte_inserted(old_pte))			\

			purge_tlb_entries(mm, addr);		\

		set_pte(ptep, pteval);				\

		spin_unlock_irqrestore(&pa_tlb_lock, flags);	\

	} while (0)
@@ -478,8 +478,8 @@ static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned 
		spin_unlock_irqrestore(&pa_tlb_lock, flags);

		return 0;

	}

	set_pte(ptep, pte_mkold(pte));

	purge_tlb_entries(vma->vm_mm, addr);

	set_pte(ptep, pte_mkold(pte));

	spin_unlock_irqrestore(&pa_tlb_lock, flags);

	return 1;

}
@@ -492,9 +492,9 @@ static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, 


	spin_lock_irqsave(&pa_tlb_lock, flags);

	old_pte = *ptep;

	set_pte(ptep, __pte(0));

	if (pte_inserted(old_pte))

		purge_tlb_entries(mm, addr);

	set_pte(ptep, __pte(0));

	spin_unlock_irqrestore(&pa_tlb_lock, flags);



	return old_pte;
@@ -504,8 +504,8 @@ static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, 
{

	unsigned long flags;

	spin_lock_irqsave(&pa_tlb_lock, flags);

	set_pte(ptep, pte_wrprotect(*ptep));

	purge_tlb_entries(mm, addr);

	set_pte(ptep, pte_wrprotect(*ptep));

	spin_unlock_irqrestore(&pa_tlb_lock, flags);

}

arch/parisc/kernel/cache.c

+11 −0
Original line number Diff line number Diff line
@@ -393,6 +393,15 @@ void __init parisc_setup_cache_timing(void) 


	/* calculate TLB flush threshold */



	/* On SMP machines, skip the TLB measure of kernel text which

	 * has been mapped as huge pages. */

	if (num_online_cpus() > 1 && !parisc_requires_coherency()) {

		threshold = max(cache_info.it_size, cache_info.dt_size);

		threshold *= PAGE_SIZE;

		threshold /= num_online_cpus();

		goto set_tlb_threshold;

	}



	alltime = mfctl(16);

	flush_tlb_all();

	alltime = mfctl(16) - alltime;
@@ -411,6 +420,8 @@ void __init parisc_setup_cache_timing(void) 
		alltime, size, rangetime);



	threshold = PAGE_ALIGN(num_online_cpus() * size * alltime / rangetime);



set_tlb_threshold:

	if (threshold)

		parisc_tlb_flush_threshold = threshold;

	printk(KERN_INFO "TLB flush threshold set to %lu KiB\n",

arch/parisc/kernel/pacache.S

+1 −21
Original line number Diff line number Diff line
@@ -896,15 +896,6 @@ ENTRY_CFI(flush_dcache_page_asm) 
	fdc,m		r31(%r28)



	sync



#ifdef CONFIG_PA20

	pdtlb,l		%r0(%r25)

#else

	tlb_lock	%r20,%r21,%r22

	pdtlb		%r0(%r25)

	tlb_unlock	%r20,%r21,%r22

#endif



	bv		%r0(%r2)

	nop

	.exit
@@ -979,17 +970,6 @@ ENTRY_CFI(flush_icache_page_asm) 
	fic,m		%r31(%sr4,%r28)



	sync



#ifdef CONFIG_PA20

	pdtlb,l		%r0(%r28)

	pitlb,l         %r0(%sr4,%r25)

#else

	tlb_lock        %r20,%r21,%r22

	pdtlb		%r0(%r28)

	pitlb           %r0(%sr4,%r25)

	tlb_unlock      %r20,%r21,%r22

#endif



	bv		%r0(%r2)

	nop

	.exit