quoted

diff --git a/arch/sparc/mm/tsb.c b/arch/sparc/mm/tsb.c
index 9eb10b4..24dcd29 100644
--- a/arch/sparc/mm/tsb.c
+++ b/arch/sparc/mm/tsb.c

@@ -6,6 +6,7 @@
 #include <linux/kernel.h>
 #include <linux/preempt.h>
 #include <linux/slab.h>
+#include <linux/locallock.h>
 #include <asm/page.h>
 #include <asm/pgtable.h>
 #include <asm/mmu_context.h>

@@ -14,6 +15,7 @@
 #include <asm/oplib.h>

 extern struct tsb swapper_tsb[KERNEL_TSB_NENTRIES];
+static DEFINE_LOCAL_IRQ_LOCK(tsb_lock);

 static inline unsigned long tsb_hash(unsigned long vaddr, unsigned long hash_sh
 {

@@ -71,9 +73,9 @@ static void __flush_tsb_one(struct tlb_batch *tb, unsigned lon
 void flush_tsb_user(struct tlb_batch *tb)
 {
        struct mm_struct *mm = tb->mm;
-       unsigned long nentries, base, flags;
+       unsigned long nentries, base;

-       raw_spin_lock_irqsave(&mm->context.lock, flags);
+       local_lock(tsb_lock);

        base = (unsigned long) mm->context.tsb_block[MM_TSB_BASE].tsb;
        nentries = mm->context.tsb_block[MM_TSB_BASE].tsb_nentries;

@@ -90,7 +92,7 @@ void flush_tsb_user(struct tlb_batch *tb)
                __flush_tsb_one(tb, HPAGE_SHIFT, base, nentries);
        }
 #endif
-       raw_spin_unlock_irqrestore(&mm->context.lock, flags);
+       local_unlock(tsb_lock);

It seems to be not good for me. Tsb setup is in tsb_grow() and it must
be synchronized with flushing. Flushing is also being made in flush_tsb_user_page()..

Which last stack stack has you received with tb->active, permanently set to zero?

I agree with you point about flushing in flush_tbs_user_page too. Like i said, this is
a bit tricky to actually debug.

Yes, tb->active was set to zero.

- Allen