Merge Linaro linux 4.9.62 into linux-4.9

Signed-off-by: Xiaobo Xie <xiaobo.xie@nxp.com>

1 files changed, 16 insertions, 23 deletions

diff --git a/arch/parisc/kernel/cache.c b/arch/parisc/kernel/cache.c
index 53ec75f..df757c9 100644
--- a/arch/parisc/kernel/cache.c
+++ b/arch/parisc/kernel/cache.c
@@ -452,8 +452,8 @@ void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
 	  before it can be accessed through the kernel mapping. */
 	preempt_disable();
 	flush_dcache_page_asm(__pa(vfrom), vaddr);
-	preempt_enable();
 	copy_page_asm(vto, vfrom);
+	preempt_enable();
 }
 EXPORT_SYMBOL(copy_user_page);
 
@@ -538,6 +538,10 @@ void flush_cache_mm(struct mm_struct *mm)
 	struct vm_area_struct *vma;
 	pgd_t *pgd;
 
+	/* Flush the TLB to avoid speculation if coherency is required. */
+	if (parisc_requires_coherency())
+		flush_tlb_all();
+
 	/* Flushing the whole cache on each cpu takes forever on
 	   rp3440, etc.  So, avoid it if the mm isn't too big.  */
 	if (mm_total_size(mm) >= parisc_cache_flush_threshold) {
@@ -594,33 +598,21 @@ flush_user_icache_range(unsigned long start, unsigned long end)
 void flush_cache_range(struct vm_area_struct *vma,
 		unsigned long start, unsigned long end)
 {
-	unsigned long addr;
-	pgd_t *pgd;
-
 	BUG_ON(!vma->vm_mm->context);
 
-	if ((end - start) >= parisc_cache_flush_threshold) {
-		flush_cache_all();
-		return;
-	}
+	/* Flush the TLB to avoid speculation if coherency is required. */
+	if (parisc_requires_coherency())
+		flush_tlb_range(vma, start, end);
 
-	if (vma->vm_mm->context == mfsp(3)) {
-		flush_user_dcache_range_asm(start, end);
-		if (vma->vm_flags & VM_EXEC)
-			flush_user_icache_range_asm(start, end);
+	if ((end - start) >= parisc_cache_flush_threshold
+	    || vma->vm_mm->context != mfsp(3)) {
+		flush_cache_all();
 		return;
 	}
 
-	pgd = vma->vm_mm->pgd;
-	for (addr = start & PAGE_MASK; addr < end; addr += PAGE_SIZE) {
-		unsigned long pfn;
-		pte_t *ptep = get_ptep(pgd, addr);
-		if (!ptep)
-			continue;
-		pfn = pte_pfn(*ptep);
-		if (pfn_valid(pfn))
-			__flush_cache_page(vma, addr, PFN_PHYS(pfn));
-	}
+	flush_user_dcache_range_asm(start, end);
+	if (vma->vm_flags & VM_EXEC)
+		flush_user_icache_range_asm(start, end);
 }
 
 void
@@ -629,7 +621,8 @@ flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr, unsigned long
 	BUG_ON(!vma->vm_mm->context);
 
 	if (pfn_valid(pfn)) {
-		flush_tlb_page(vma, vmaddr);
+		if (parisc_requires_coherency())
+			flush_tlb_page(vma, vmaddr);
 		__flush_cache_page(vma, vmaddr, PFN_PHYS(pfn));
 	}
 }