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Message-ID: <20110716030515.GA13614@ele.uri.edu>
Date: Fri, 15 Jul 2011 23:05:15 -0400
From: Will Simoneau <simoneau@....uri.edu>
To: davem@...emloft.net
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH] sun4m SMP: fix wrong shift instruction in IPI handler
This shift instruction appears to be shifting in the wrong direction.
Without this change, my SparcStation-20MP hangs just after bringing up
the second CPU:
Entering SMP Mode...
Starting CPU 2 at f02b4e90
Brought up 2 CPUs
Total of 2 processors activated (99.52 BogoMIPS).
*** stuck ***
Signed-off-by: Will Simoneau <simoneau@....uri.edu>
---
arch/sparc/kernel/entry.S | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/arch/sparc/kernel/entry.S b/arch/sparc/kernel/entry.S
index 9fe08a1..f445e98 100644
--- a/arch/sparc/kernel/entry.S
+++ b/arch/sparc/kernel/entry.S
@@ -293,7 +293,7 @@ maybe_smp4m_msg:
WRITE_PAUSE
wr %l4, PSR_ET, %psr
WRITE_PAUSE
- sll %o3, 28, %o2 ! shift for simpler checks below
+ srl %o3, 28, %o2 ! shift for simpler checks below
maybe_smp4m_msg_check_single:
andcc %o2, 0x1, %g0
beq,a maybe_smp4m_msg_check_mask
--
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