linux-kernel - [ 04/55] PARISC: fix PA1.1 oops on boot

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Message-Id: <20120527002614.312238425@linuxfoundation.org>
Date:	Sun, 27 May 2012 09:26:17 +0900
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	James Bottomley <JBottomley@...allels.com>
Subject: [ 04/55] PARISC: fix PA1.1 oops on boot

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: James Bottomley <JBottomley@...allels.com>

commit 5e185581d7c46ddd33cd9c01106d1fc86efb9376 upstream.

All PA1.1 systems have been oopsing on boot since

commit f311847c2fcebd81912e2f0caf8a461dec28db41
Author: James Bottomley <James.Bottomley@...senPartnership.com>
Date:   Wed Dec 22 10:22:11 2010 -0600

    parisc: flush pages through tmpalias space

because a PA2.0 instruction was accidentally introduced into the PA1.1 TLB
insertion interruption path when it was consolidated with the do_alias macro.
Fix the do_alias macro only to use PA2.0 instructions if compiled for 64 bit.

Signed-off-by: James Bottomley <JBottomley@...allels.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/parisc/kernel/entry.S |    4 ++++
 1 file changed, 4 insertions(+)

--- a/arch/parisc/kernel/entry.S
+++ b/arch/parisc/kernel/entry.S
@@ -581,7 +581,11 @@
 	 */
 	cmpiclr,=	0x01,\tmp,%r0
 	ldi		(_PAGE_DIRTY|_PAGE_READ|_PAGE_WRITE),\prot
+#ifdef CONFIG_64BIT
 	depd,z		\prot,8,7,\prot
+#else
+	depw,z		\prot,8,7,\prot
+#endif
 	/*
 	 * OK, it is in the temp alias region, check whether "from" or "to".
 	 * Check "subtle" note in pacache.S re: r23/r26.


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