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Commit 849c4987 authored by David S. Miller's avatar David S. Miller
Browse files

sparc64: Handle extremely large kernel TSB range flushes sanely. 



If the number of pages we are flushing is more than twice the number
of entries in the TSB, just scan the TSB table for matches rather
than probing each and every page in the range.

Based upon a patch and report by James Clarke.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 9d9fa230

arch/sparc/mm/tsb.c

+17 −0
Original line number Diff line number Diff line
@@ -27,6 +27,20 @@ static inline int tag_compare(unsigned long tag, unsigned long vaddr) 
	return (tag == (vaddr >> 22));

}



static void flush_tsb_kernel_range_scan(unsigned long start, unsigned long end)

{

	unsigned long idx;



	for (idx = 0; idx < KERNEL_TSB_NENTRIES; idx++) {

		struct tsb *ent = &swapper_tsb[idx];

		unsigned long match = idx << 13;



		match |= (ent->tag << 22);

		if (match >= start && match < end)

			ent->tag = (1UL << TSB_TAG_INVALID_BIT);

	}

}



/* TSB flushes need only occur on the processor initiating the address

 * space modification, not on each cpu the address space has run on.

 * Only the TLB flush needs that treatment.
@@ -36,6 +50,9 @@ void flush_tsb_kernel_range(unsigned long start, unsigned long end) 
{

	unsigned long v;



	if ((end - start) >> PAGE_SHIFT >= 2 * KERNEL_TSB_NENTRIES)

		return flush_tsb_kernel_range_scan(start, end);



	for (v = start; v < end; v += PAGE_SIZE) {

		unsigned long hash = tsb_hash(v, PAGE_SHIFT,

					      KERNEL_TSB_NENTRIES);