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ARM: pgtable: consolidate set_pte_ext(TOP_PTE,...) + tlb flush

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A number of places establish a PTE in our top page table and
immediately flush the TLB.  Rather than having this at every callsite,
provide an inline function for this purpose.

This changes some global tlb flushes to be local; each time we setup
one of these mappings, we always do it with preemption disabled which
would prevent us migrating to another CPU.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King
2011-07-02 15:20:44 +01:00
parent 6e78df1761
commit 67ece14431
6 changed files with 20 additions and 25 deletions
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10
arch/arm/mm/copypage-v6.c
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@@ -90,11 +90,8 @@ static void v6_copy_user_highpage_aliasing(struct page *to,
kfrom = COPYPAGE_V6_FROM + (offset << PAGE_SHIFT);
kto = COPYPAGE_V6_TO + (offset << PAGE_SHIFT);
set_pte_ext(TOP_PTE(kfrom), mk_pte(from, PAGE_KERNEL), 0);
set_pte_ext(TOP_PTE(kto), mk_pte(to, PAGE_KERNEL), 0);
flush_tlb_kernel_page(kfrom);
flush_tlb_kernel_page(kto);
set_top_pte(kfrom, mk_pte(from, PAGE_KERNEL));
set_top_pte(kto, mk_pte(to, PAGE_KERNEL));
copy_page((void *)kto, (void *)kfrom);
@@ -119,8 +116,7 @@ static void v6_clear_user_highpage_aliasing(struct page *page, unsigned long vad
*/
raw_spin_lock(&v6_lock);
set_pte_ext(TOP_PTE(to), mk_pte(page, PAGE_KERNEL), 0);
flush_tlb_kernel_page(to);
set_top_pte(to, mk_pte(page, PAGE_KERNEL));
clear_page((void *)to);
raw_spin_unlock(&v6_lock);