x86, UV: Remove BAU check for stay-busy
authorCliff Wickman <cpw@sgi.com>
Wed, 2 Jun 2010 21:22:02 +0000 (16:22 -0500)
committerIngo Molnar <mingo@elte.hu>
Tue, 8 Jun 2010 19:13:47 +0000 (21:13 +0200)
commit90cc7d944981a6d06b49bb26fde1b490e28c90e5
tree21e2d202c168e8b0ff17907954a7106f018a5f26
parenta8328ee58c15c9d763a67607a35bb987b38950fa
x86, UV: Remove BAU check for stay-busy

Remove a faulty assumption that a long running BAU request has
encountered a hardware problem and will never finish.

Numalink congestion can make a request appear to have
encountered such a problem, but it is not safe to cancel the
request.  If such a cancel is done but a reply is later received
we can miss a TLB shootdown.

We depend upon the max_bau_concurrent 'throttle' to prevent the
stay-busy case from happening.

Signed-off-by: Cliff Wickman <cpw@sgi.com>
Cc: gregkh@suse.de
LKML-Reference: <E1OJvNy-0004ad-BV@eag09.americas.sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
arch/x86/include/asm/uv/uv_bau.h
arch/x86/kernel/tlb_uv.c