linux-kernel - [PATCH -fixes] riscv: Fix orphan section warnings caused by kernel/pi

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Date:   Thu,  4 May 2023 14:07:59 +0200
From:   Alexandre Ghiti <alexghiti@...osinc.com>
To:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Björn Töpel <bjorn@...osinc.com>,
        Alexandre Ghiti <alexghiti@...osinc.com>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     kernel test robot <lkp@...el.com>
Subject: [PATCH -fixes] riscv: Fix orphan section warnings caused by kernel/pi

kernel/pi gives rise to a lot of new sections that end up orphans: the
first attempt to fix that tried to enumerate them all in the linker
script, but kernel test robot with a random config keeps finding more of
them.

So prefix all those sections with .init.pi instead of only .init in
order to be able to easily catch them all in the linker script.

Reported-by: kernel test robot <lkp@...el.com>
Link: https://lore.kernel.org/oe-kbuild-all/202304301606.Cgp113Ha-lkp@intel.com/
Fixes: 26e7aacb83df ("riscv: Allow to downgrade paging mode from the command line")
Signed-off-by: Alexandre Ghiti <alexghiti@...osinc.com>
---
 arch/riscv/kernel/pi/Makefile   | 2 +-
 arch/riscv/kernel/vmlinux.lds.S | 7 ++-----
 2 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/arch/riscv/kernel/pi/Makefile b/arch/riscv/kernel/pi/Makefile
index 741b7bd3a84c..07915dc9279e 100644
--- a/arch/riscv/kernel/pi/Makefile
+++ b/arch/riscv/kernel/pi/Makefile
@@ -22,7 +22,7 @@ KCOV_INSTRUMENT	:= n
 
 $(obj)/%.pi.o: OBJCOPYFLAGS := --prefix-symbols=__pi_ \
 			       --remove-section=.note.gnu.property \
-			       --prefix-alloc-sections=.init
+			       --prefix-alloc-sections=.init.pi
 $(obj)/%.pi.o: $(obj)/%.o FORCE
 	$(call if_changed,objcopy)
 
diff --git a/arch/riscv/kernel/vmlinux.lds.S b/arch/riscv/kernel/vmlinux.lds.S
index 305877d85e96..e66e26640f63 100644
--- a/arch/riscv/kernel/vmlinux.lds.S
+++ b/arch/riscv/kernel/vmlinux.lds.S
@@ -84,11 +84,8 @@ SECTIONS
 	__init_data_begin = .;
 	INIT_DATA_SECTION(16)
 
-	/* Those sections result from the compilation of kernel/pi/string.c */
-	.init.pidata : {
-		*(.init.srodata.cst8*)
-		*(.init__bug_table*)
-		*(.init.sdata*)
+	.init.pi : {
+		*(.init.pi*)
 	}
 
 	.init.bss : {
-- 
2.37.2