linux-kernel - Re: [next] arm64: efi-rt-wrapper.S:8: Error: unknown mnemonic `bti' -- `bti c'

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Date:   Fri, 17 Dec 2021 15:53:13 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Mark Brown <broonie@...nel.org>
Cc:     Naresh Kamboju <naresh.kamboju@...aro.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        Will Deacon <will@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [next] arm64: efi-rt-wrapper.S:8: Error: unknown mnemonic `bti'
 -- `bti c'

On Fri, Dec 17, 2021 at 02:49:30PM +0000, Mark Brown wrote:
> On Fri, Dec 17, 2021 at 02:00:24PM +0000, Catalin Marinas wrote:
> > 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:
> 
> That seems sensible to me, especially given the small number of files
> affected.  The other thing would be to decide that all assembly files
> should have the header included by default but that seems like it's
> invasive and probably disproportionate.

There's also this:

diff --git a/arch/arm64/include/asm/linkage.h b/arch/arm64/include/asm/linkage.h
index 9065e4749b42..b77e9b3f5371 100644
--- a/arch/arm64/include/asm/linkage.h
+++ b/arch/arm64/include/asm/linkage.h
@@ -1,6 +1,10 @@
 #ifndef __ASM_LINKAGE_H
 #define __ASM_LINKAGE_H

+#ifdef __ASSEMBLY__
+#include <asm/assembler.h>
+#endif
+
 #define __ALIGN		.align 2
 #define __ALIGN_STR	".align 2"

-- 
Catalin