Re: [patch 2/21] reduced locking in buffer.c

[David S. Miller]

   From: Linus Torvalds <[e-mail]>
   Date: Tue, 13 Aug 2002 10:34:37 -0700 (PDT)

   On Sun, 11 Aug 2002, Andrew Morton wrote:
   > Resend.  Replace the buffer lru spinlock protection with
   > local_irq_disable and a cross-CPU call to invalidate them.
   
   This almost certainly breaks on sparc, where CPU cross-calls are 
   non-maskable, so local_irq_disable doesn't do anything for them.
   
   Talk to Davem about this - there may be some workaround.

I told him it's OK in 2.5.x as I've discovered a way to implement
sparc32 (once we have it working again) such that local_irq_disable
blocks cross calls.