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nds32: Disable local irq before calling cpu_dcache_wb_page in copy_user_highpage 

In order to ensure that all data in source page has been written back
to memory before copy_page, the local irq shall be disabled before
calling cpu_dcache_wb_page(). In addition, removing unneeded page
invalidation for 'to' page.

Signed-off-by: Vincent Chen <vincentc@andestech.com>
Reviewed-by: Greentime Hu <greentime@andestech.com>
Signed-off-by: Greentime Hu <greentime@andestech.com>
This commit is contained in:
Vincent Chen 2018-05-14 18:56:35 +08:00 committed by Greentime Hu
parent 5b9f95699b
commit aaaaba5750
1 changed files with 1 additions and 3 deletions
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4
arch/nds32/mm/cacheflush.c
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@ -175,11 +175,9 @@ void copy_user_highpage(struct page *to, struct page *from,
pto = page_to_phys(to);
pfrom = page_to_phys(from);
local_irq_save(flags);
if (aliasing(vaddr, (unsigned long)kfrom))
cpu_dcache_wb_page((unsigned long)kfrom);
if (aliasing(vaddr, (unsigned long)kto))
cpu_dcache_inval_page((unsigned long)kto);
local_irq_save(flags);
vto = kremap0(vaddr, pto);
vfrom = kremap1(vaddr, pfrom);
copy_page((void *)vto, (void *)vfrom);