The patch titled Subject: x86/purgatory: remove PGO flags has been added to the -mm mm-hotfixes-unstable branch. Its filename is x86-purgatory-remove-pgo-flags.patch

This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...

This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------ From: Ricardo Ribalda ribalda@chromium.org Subject: x86/purgatory: remove PGO flags Date: Fri, 19 May 2023 16:47:37 +0200

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-v7-2-b05c520b7296@chromium.... Fixes: 930457057abe ("kernel/kexec_file.c: split up __kexec_load_puragory") Signed-off-by: Ricardo Ribalda ribalda@chromium.org Cc: stable@vger.kernel.org Cc: Albert Ou aou@eecs.berkeley.edu Cc: Baoquan He bhe@redhat.com Cc: Borislav Petkov (AMD) bp@alien8.de Cc: Christophe Leroy christophe.leroy@csgroup.eu Cc: Dave Hansen dave.hansen@linux.intel.com Cc: Dave Young dyoung@redhat.com Cc: Eric W. Biederman ebiederm@xmission.com Cc: "H. Peter Anvin" hpa@zytor.com Cc: Ingo Molnar mingo@redhat.com Cc: Michael Ellerman mpe@ellerman.id.au Cc: Nathan Chancellor nathan@kernel.org Cc: Nicholas Piggin npiggin@gmail.com Cc: Nick Desaulniers ndesaulniers@google.com Cc: Palmer Dabbelt palmer@dabbelt.com Cc: Palmer Dabbelt palmer@rivosinc.com Cc: Paul Walmsley paul.walmsley@sifive.com Cc: Philipp Rudo prudo@redhat.com Cc: Ross Zwisler zwisler@google.com Cc: Simon Horman horms@kernel.org Cc: Steven Rostedt (Google) rostedt@goodmis.org Cc: Thomas Gleixner tglx@linutronix.de Cc: Tom Rix trix@redhat.com Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

arch/x86/purgatory/Makefile | 5 +++++ 1 file changed, 5 insertions(+)

--- a/arch/x86/purgatory/Makefile~x86-purgatory-remove-pgo-flags +++ a/arch/x86/purgatory/Makefile @@ -14,6 +14,11 @@ $(obj)/sha256.o: $(srctree)/lib/crypto/s

CFLAGS_sha256.o := -D__DISABLE_EXPORTS

+# 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)) + # When linking purgatory.ro with -r unresolved symbols are not checked, # also link a purgatory.chk binary without -r to check for unresolved symbols. PURGATORY_LDFLAGS := -e purgatory_start -z nodefaultlib _

Patches currently in -mm which might be from ribalda@chromium.org are

kexec-support-purgatories-with-texthot-sections.patch x86-purgatory-remove-pgo-flags.patch powerpc-purgatory-remove-pgo-flags.patch riscv-purgatory-remove-pgo-flags.patch