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| author | Mark Rutland <mark.rutland@arm.com> | 2021-06-18 18:11:22 +0300 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2021-06-21 13:58:03 +0300 |
| commit | 69bb0585ebb0c48c93fc55fc27afbfc06adef2fd (patch) | |
| tree | 7afd47d8cd20c9dae154f78fd57093182f8eeacd /arch/arm64 | |
| parent | 3e00e39d9dad48360ebd518726ebf81da1b84c10 (diff) | |
| download | linux-69bb0585ebb0c48c93fc55fc27afbfc06adef2fd.tar.xz | |
arm64: insn: avoid circular include dependency
Nathan reports that when building with CONFIG_LTO_CLANG_THIN=y, the
build fails due to BUILD_BUG_ON() not being defined before its uss in
<asm/insn.h>.
The problem is that with LTO, we patch READ_ONCE(), and <asm/rwonce.h>
includes <asm/insn.h>, creating a circular include chain:
<linux/build_bug.h>
<linux/compiler.h>
<asm/rwonce.h>
<asm/alternative-macros.h>
<asm/insn.h>
<linux/build-bug.h>
... and so when <asm/insn.h> includes <linux/build_bug.h>, none of the
BUILD_BUG* definitions have happened yet.
To avoid this, let's move AARCH64_INSN_SIZE into a header without any
dependencies, such that it can always be safely included. At the same
time, avoid including <asm/alternative.h> in <asm/insn.h>, which should
no longer be necessary (and doesn't make sense when insn.h is consumed
by userspace).
Reported-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20210621080830.GA37068@C02TD0UTHF1T.local
Fixes: 3e00e39d9dad ("arm64: insn: move AARCH64_INSN_SIZE into <asm/insn.h>")
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/include/asm/alternative-macros.h | 2 | ||||
| -rw-r--r-- | arch/arm64/include/asm/insn-def.h | 9 | ||||
| -rw-r--r-- | arch/arm64/include/asm/insn.h | 5 |
3 files changed, 11 insertions, 5 deletions
diff --git a/arch/arm64/include/asm/alternative-macros.h b/arch/arm64/include/asm/alternative-macros.h index 703fbf310b79..eba3173a2a2c 100644 --- a/arch/arm64/include/asm/alternative-macros.h +++ b/arch/arm64/include/asm/alternative-macros.h @@ -3,7 +3,7 @@ #define __ASM_ALTERNATIVE_MACROS_H #include <asm/cpucaps.h> -#include <asm/insn.h> +#include <asm/insn-def.h> #define ARM64_CB_PATCH ARM64_NCAPS diff --git a/arch/arm64/include/asm/insn-def.h b/arch/arm64/include/asm/insn-def.h new file mode 100644 index 000000000000..2c075f615c6a --- /dev/null +++ b/arch/arm64/include/asm/insn-def.h @@ -0,0 +1,9 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#ifndef __ASM_INSN_DEF_H +#define __ASM_INSN_DEF_H + +/* A64 instructions are always 32 bits. */ +#define AARCH64_INSN_SIZE 4 + +#endif /* __ASM_INSN_DEF_H */ diff --git a/arch/arm64/include/asm/insn.h b/arch/arm64/include/asm/insn.h index 1430b4973039..6b776c8667b2 100644 --- a/arch/arm64/include/asm/insn.h +++ b/arch/arm64/include/asm/insn.h @@ -10,10 +10,7 @@ #include <linux/build_bug.h> #include <linux/types.h> -#include <asm/alternative.h> - -/* A64 instructions are always 32 bits. */ -#define AARCH64_INSN_SIZE 4 +#include <asm/insn-def.h> #ifndef __ASSEMBLY__ /* |