If PGO is enabled, the purgatory ends up with multiple .text sections.
This is not supported by kexec and crashes the system.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 930457057abe ("kernel/kexec_file.c: split up __kexec_load_puragory")
Signed-off-by: Ricardo Ribalda <ribalda@xxxxxxxxxxxx>
---
arch/x86/purgatory/Makefile | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/arch/x86/purgatory/Makefile b/arch/x86/purgatory/Makefile
index 82fec66d46d2..7a7a4901ed41 100644
--- a/arch/x86/purgatory/Makefile
+++ b/arch/x86/purgatory/Makefile
@@ -14,6 +14,11 @@ $(obj)/sha256.o: $(srctree)/lib/crypto/sha256.c FORCE
CFLAGS_sha256.o := -D__DISABLE_EXPORTS
+# When profile 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
--
2.40.1.495.gc816e09b53d-goog
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