From: Chris Dearman <chris@mips.com>
To: linux-mips <linux-mips@linux-mips.org>
Subject: [PATCH] Avoid potential hazard on Context register
Date: Sat, 10 Oct 2009 23:07:21 -0700 [thread overview]
Message-ID: <4AD17619.1000201@mips.com> (raw)
set_saved_sp reads Context register. Avoid reading stale value from
earlier incomplete write
Signed-off-by: Chris Dearman <chris@mips.com>
---
arch/mips/kernel/head.S | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/arch/mips/kernel/head.S b/arch/mips/kernel/head.S
index 531ce7b..ea695d9 100644
--- a/arch/mips/kernel/head.S
+++ b/arch/mips/kernel/head.S
@@ -191,6 +191,7 @@ NESTED(kernel_entry, 16, sp) # kernel entry point
/* Set the SP after an empty pt_regs. */
PTR_LI sp, _THREAD_SIZE - 32 - PT_SIZE
PTR_ADDU sp, $28
+ back_to_back_c0_hazard
set_saved_sp sp, t0, t1
PTR_SUBU sp, 4 * SZREG # init stack pointer
next reply other threads:[~2009-10-11 6:07 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-11 6:07 Chris Dearman [this message]
2009-10-11 13:39 ` [PATCH] Avoid potential hazard on Context register Ralf Baechle
2009-10-11 14:53 ` Ralf Baechle
2009-10-11 20:26 ` Chris Dearman
2009-10-12 3:20 ` Ralf Baechle
2009-10-11 20:05 ` Chris Dearman
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