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SubjectRe: [next] arm64: efi-rt-wrapper.S:8: Error: unknown mnemonic `bti' -- `bti c'
Thanks Naresh for the report.

On Thu, Dec 16, 2021 at 09:30:44AM +0530, Naresh Kamboju wrote:
> [ Please ignore this email if it is already reported ]
>
> While building Linux next 20211215 arm64 defconfig with gcc-8
> following warnings / errors noticed.
> and gcc-9, gcc-10 and gcc-11 builds pass.
>
> make --silent --keep-going --jobs=8
> O=/home/tuxbuild/.cache/tuxmake/builds/current \
> ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- \
> CROSS_COMPILE_COMPAT=arm-linux-gnueabihf- \
> 'CC=sccache aarch64-linux-gnu-gcc' \
> 'HOSTCC=sccache gcc'
>
> /builds/linux/arch/arm64/kernel/efi-rt-wrapper.S: Assembler messages:
> /builds/linux/arch/arm64/kernel/efi-rt-wrapper.S:8: Error: unknown
> mnemonic `bti' -- `bti c'
> make[3]: *** [/builds/linux/scripts/Makefile.build:411:
> arch/arm64/kernel/efi-rt-wrapper.o] Error 1

We defined the bti macro in assembler.h but that's not included by
linkage.h and not all asm files seem to include the former. At a quick
grep we need the diff below, not sure it's the best solution:

diff --git a/arch/arm64/crypto/nh-neon-core.S b/arch/arm64/crypto/nh-neon-core.S
index 51c0a534ef87..bf6f7ee46d63 100644
--- a/arch/arm64/crypto/nh-neon-core.S
+++ b/arch/arm64/crypto/nh-neon-core.S
@@ -8,6 +8,7 @@
*/

#include <linux/linkage.h>
+#include <asm/assembler.h>

KEY .req x0
MESSAGE .req x1
diff --git a/arch/arm64/kernel/efi-rt-wrapper.S b/arch/arm64/kernel/efi-rt-wrapper.S
index 75691a2641c1..9fde85521146 100644
--- a/arch/arm64/kernel/efi-rt-wrapper.S
+++ b/arch/arm64/kernel/efi-rt-wrapper.S
@@ -4,6 +4,7 @@
*/

#include <linux/linkage.h>
+#include <asm/assembler.h>

SYM_FUNC_START(__efi_rt_asm_wrapper)
stp x29, x30, [sp, #-32]!
diff --git a/arch/arm64/kernel/reloc_test_syms.S b/arch/arm64/kernel/reloc_test_syms.S
index c50f45fa29fa..57bf78446a29 100644
--- a/arch/arm64/kernel/reloc_test_syms.S
+++ b/arch/arm64/kernel/reloc_test_syms.S
@@ -4,6 +4,7 @@
*/

#include <linux/linkage.h>
+#include <asm/assembler.h>

SYM_FUNC_START(absolute_data64)
ldr x0, 0f
--
Catalin

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