[PATCH v6 2/4] x86/purgatory: Remove profile optimization flags
From: Ricardo Ribalda <hidden>
Date: 2023-05-01 12:39:10
Also in:
kexec, linux-riscv, lkml, llvm, stable
Subsystem:
the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
If PGO is enabled, the purgatory ends up with multiple .text sections.
This is not supported by kexec and crashes the system.
Cc: stable@vger.kernel.org
Fixes: 930457057abe ("kernel/kexec_file.c: split up __kexec_load_puragory")
Signed-off-by: Ricardo Ribalda <redacted>
---
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