[PATCH v7 3/4] powerpc/purgatory: Remove PGO flags

Ricardo Ribalda ribalda at chromium.org
Sat May 20 00:47:38 AEST 2023

If profile-guided optimization is enabled, the purgatory ends up with
multiple .text sections.
This is not supported by kexec and crashes the system.

Cc: stable at vger.kernel.org
Fixes: 930457057abe ("kernel/kexec_file.c: split up __kexec_load_puragory")
Signed-off-by: Ricardo Ribalda <ribalda at chromium.org>
 arch/powerpc/purgatory/Makefile | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/powerpc/purgatory/Makefile b/arch/powerpc/purgatory/Makefile
index 6f5e2727963c..78473d69cd2b 100644
--- 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


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