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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-07-23 23:15:28 (GMT)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-08-20 00:24:56 (GMT)
commitc7cc58a1ad8dfe3c199d3b6ce50412b86dd3edaf (patch)
tree1d1ded72de81743ddd1306677d64757136972402 /arch/powerpc/mm/tlb_nohash.c
parentcf54dc7cd4f9aab55cd3e1794b0b74c3c88cd1a0 (diff)
downloadlinux-c7cc58a1ad8dfe3c199d3b6ce50412b86dd3edaf.tar.xz
powerpc/mm: Rework & cleanup page table freeing code path
That patch used to just add a hook to page table flushing but pulling that string brought out a whole bunch of issues, so it now does that and more: - We now make the RCU batching of page freeing SMP only, as I believe it was intended initially. We make a few more things compile to nothing on !CONFIG_SMP - Some macros are turned into functions, though that forced me to out of line a few stuffs due to unsolvable include depenencies, however it's probably better that way anyway, it's not -that- critical code path. - 32-bit didn't call pte_free_finish() on tlb_flush() which means that it wouldn't push out the batch to RCU for delayed freeing when a bunch of page tables have been freed, they would just stay in there until the batch gets full. 64-bit BookE will use that hook to maintain the virtually linear page tables or the indirect entries in the TLB when using the HW loader. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/mm/tlb_nohash.c')
-rw-r--r--arch/powerpc/mm/tlb_nohash.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/powerpc/mm/tlb_nohash.c b/arch/powerpc/mm/tlb_nohash.c
index 761e888..6b43fc4 100644
--- a/arch/powerpc/mm/tlb_nohash.c
+++ b/arch/powerpc/mm/tlb_nohash.c
@@ -233,3 +233,11 @@ void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
flush_tlb_mm(vma->vm_mm);
}
EXPORT_SYMBOL(flush_tlb_range);
+
+void tlb_flush(struct mmu_gather *tlb)
+{
+ flush_tlb_mm(tlb->mm);
+
+ /* Push out batch of freed page tables */
+ pte_free_finish();
+}