From: Ricardo Ribalda ribalda@chromium.org
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@chromium.... Fixes: 930457057abe ("kernel/kexec_file.c: split up __kexec_load_puragory") Signed-off-by: Ricardo Ribalda ribalda@chromium.org Cc: Michael Ellerman mpe@ellerman.id.au Cc: Nicholas Piggin npiggin@gmail.com Cc: Christophe Leroy christophe.leroy@csgroup.eu 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: 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: Nathan Chancellor nathan@kernel.org 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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/powerpc/purgatory/Makefile | 5 +++++ 1 file changed, 5 insertions(+)
--- a/arch/powerpc/purgatory/Makefile +++ b/arch/powerpc/purgatory/Makefile @@ -5,6 +5,11 @@ KCSAN_SANITIZE := n
targets += trampoline_$(BITS).o purgatory.ro
+# 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