Patch "parisc/firmware: Fix F-extend for PDC addresses" has been added to the 4.19-stable tree

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This is a note to let you know that I've just added the patch titled

    parisc/firmware: Fix F-extend for PDC addresses

to the 4.19-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     parisc-firmware-fix-f-extend-for-pdc-addresses.patch
and it can be found in the queue-4.19 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 735ae74f73e55c191d48689bd11ff4a06ea0508f Mon Sep 17 00:00:00 2001
From: Helge Deller <deller@xxxxxx>
Date: Wed, 3 Jan 2024 21:02:16 +0100
Subject: parisc/firmware: Fix F-extend for PDC addresses

From: Helge Deller <deller@xxxxxx>

commit 735ae74f73e55c191d48689bd11ff4a06ea0508f upstream.

When running with narrow firmware (64-bit kernel using a 32-bit
firmware), extend PDC addresses into the 0xfffffff0.00000000
region instead of the 0xf0f0f0f0.00000000 region.

This fixes the power button on the C3700 machine in qemu (64-bit CPU
with 32-bit firmware), and my assumption is that the previous code was
really never used (because most 64-bit machines have a 64-bit firmware),
or it just worked on very old machines because they may only decode
40-bit of virtual addresses.

Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Helge Deller <deller@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 arch/parisc/kernel/firmware.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/parisc/kernel/firmware.c
+++ b/arch/parisc/kernel/firmware.c
@@ -127,10 +127,10 @@ static unsigned long f_extend(unsigned l
 #ifdef CONFIG_64BIT
 	if(unlikely(parisc_narrow_firmware)) {
 		if((address & 0xff000000) == 0xf0000000)
-			return 0xf0f0f0f000000000UL | (u32)address;
+			return (0xfffffff0UL << 32) | (u32)address;
 
 		if((address & 0xf0000000) == 0xf0000000)
-			return 0xffffffff00000000UL | (u32)address;
+			return (0xffffffffUL << 32) | (u32)address;
 	}
 #endif
 	return address;


Patches currently in stable-queue which might be from deller@xxxxxx are

queue-4.19/parisc-firmware-fix-f-extend-for-pdc-addresses.patch




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