This is a note to let you know that I've just added the patch titled
powerpc/boot: Explicitly disable usage of SPE instructions
to the 5.10-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:
powerpc-boot-explicitly-disable-usage-of-spe-instructions.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 110a58b9f91c66f743c01a2c217243d94c899c23 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@xxxxxxxxxx>
Date: Sat, 27 Aug 2022 15:44:54 +0200
Subject: powerpc/boot: Explicitly disable usage of SPE instructions
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From: Pali Rohár <pali@xxxxxxxxxx>
commit 110a58b9f91c66f743c01a2c217243d94c899c23 upstream.
uImage boot wrapper should not use SPE instructions, like kernel itself.
Boot wrapper has already disabled Altivec and VSX instructions but not SPE.
Options -mno-spe and -mspe=no already set when compilation of kernel, but
not when compiling uImage wrapper yet. Fix it.
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Pali Rohár <pali@xxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20220827134454.17365-1-pali@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/boot/Makefile | 1 +
1 file changed, 1 insertion(+)
--- a/arch/powerpc/boot/Makefile
+++ b/arch/powerpc/boot/Makefile
@@ -30,6 +30,7 @@ endif
BOOTCFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
-fno-strict-aliasing -O2 -msoft-float -mno-altivec -mno-vsx \
+ $(call cc-option,-mno-spe) $(call cc-option,-mspe=no) \
-pipe -fomit-frame-pointer -fno-builtin -fPIC -nostdinc \
$(LINUXINCLUDE)
Patches currently in stable-queue which might be from pali@xxxxxxxxxx are
queue-5.10/powerpc-boot-explicitly-disable-usage-of-spe-instructions.patch
