This is a note to let you know that I've just added the patch titled
powerpc/purgatory: remove PGO flags
to the 5.15-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-purgatory-remove-pgo-flags.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 20188baceb7a1463dc0bcb0c8678b69c2f447df6 Mon Sep 17 00:00:00 2001
From: Ricardo Ribalda <ribalda@xxxxxxxxxxxx>
Date: Fri, 19 May 2023 16:47:38 +0200
Subject: powerpc/purgatory: remove PGO flags
From: Ricardo Ribalda <ribalda@xxxxxxxxxxxx>
commit 20188baceb7a1463dc0bcb0c8678b69c2f447df6 upstream.
If profile-guided optimization is enabled, the purgatory ends up with
multiple .text sections. This is not supported by kexec and crashes the
system.
Link: https://lkml.kernel.org/r/20230321-kexec_clang16-v7-3-b05c520b7296@xxxxxxxxxxxx
Fixes: 930457057abe ("kernel/kexec_file.c: split up __kexec_load_puragory")
Signed-off-by: Ricardo Ribalda <ribalda@xxxxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
Cc: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Cc: Albert Ou <aou@xxxxxxxxxxxxxxxxx>
Cc: Baoquan He <bhe@xxxxxxxxxx>
Cc: Borislav Petkov (AMD) <bp@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Dave Young <dyoung@xxxxxxxxxx>
Cc: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Nathan Chancellor <nathan@xxxxxxxxxx>
Cc: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Cc: Palmer Dabbelt <palmer@xxxxxxxxxxx>
Cc: Palmer Dabbelt <palmer@xxxxxxxxxxxx>
Cc: Paul Walmsley <paul.walmsley@xxxxxxxxxx>
Cc: Philipp Rudo <prudo@xxxxxxxxxx>
Cc: Ross Zwisler <zwisler@xxxxxxxxxx>
Cc: Simon Horman <horms@xxxxxxxxxx>
Cc: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Tom Rix <trix@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/purgatory/Makefile | 5 +++++
1 file changed, 5 insertions(+)
--- a/arch/powerpc/purgatory/Makefile
+++ b/arch/powerpc/purgatory/Makefile
@@ -4,6 +4,11 @@ KASAN_SANITIZE := n
targets += trampoline_$(BITS).o purgatory.ro kexec-purgatory.c
+# When profile-guided optimization is enabled, llvm emits two different
+# overlapping text sections, which is not supported by kexec. Remove profile
+# optimization flags.
+KBUILD_CFLAGS := $(filter-out -fprofile-sample-use=% -fprofile-use=%,$(KBUILD_CFLAGS))
+
LDFLAGS_purgatory.ro := -e purgatory_start -r --no-undefined
$(obj)/purgatory.ro: $(obj)/trampoline_$(BITS).o FORCE
Patches currently in stable-queue which might be from ribalda@xxxxxxxxxxxx are
queue-5.15/x86-purgatory-remove-pgo-flags.patch
queue-5.15/powerpc-purgatory-remove-pgo-flags.patch
queue-5.15/kexec-support-purgatories-with-.text.hot-sections.patch
