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authorMax Filippov <jcmvbkbc@gmail.com>2014-02-14 14:08:48 +0400
committerMax Filippov <jcmvbkbc@gmail.com>2014-04-06 21:29:17 +0400
commit04c6b3e2b5e5c1dbd99ad7620033eafd05ff4c26 (patch)
treea6f93ad79be6262819a5bc6b73f2646c4f4985dd /arch/xtensa/mm/tlb.c
parent8585b316bbed9339412d267c1fd8839dd059d69f (diff)
downloadlinux-04c6b3e2b5e5c1dbd99ad7620033eafd05ff4c26.tar.gz
xtensa: optimize local_flush_tlb_kernel_range
Don't flush whole TLB if only a small kernel range is requested. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa/mm/tlb.c')
-rw-r--r--arch/xtensa/mm/tlb.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/xtensa/mm/tlb.c b/arch/xtensa/mm/tlb.c
index ade623826788..5ece856c5725 100644
--- a/arch/xtensa/mm/tlb.c
+++ b/arch/xtensa/mm/tlb.c
@@ -149,6 +149,21 @@ void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
local_irq_restore(flags);
}
+void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
+{
+ if (end > start && start >= TASK_SIZE && end <= PAGE_OFFSET &&
+ end - start < _TLB_ENTRIES << PAGE_SHIFT) {
+ start &= PAGE_MASK;
+ while (start < end) {
+ invalidate_itlb_mapping(start);
+ invalidate_dtlb_mapping(start);
+ start += PAGE_SIZE;
+ }
+ } else {
+ local_flush_tlb_all();
+ }
+}
+
#ifdef CONFIG_DEBUG_TLB_SANITY
static unsigned get_pte_for_vaddr(unsigned vaddr)