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linux
x86/asm: Make <asm/asm.h> valid on cross-builds as well
Stephen Rothwell reported that the objtool cross-build breaks on
non-x86 hosts:
> tools/arch/x86/include/asm/asm.h:185:24: error: invalid register name for 'current_stack_pointer'
> 185 | register unsigned long current_stack_pointer asm(_ASM_SP);
> | ^~~~~~~~~~~~~~~~~~~~~
The PowerPC host obviously doesn't know much about x86 register names.
Protect the kernel-specific bits of <asm/asm.h>, so that it can be
included by tooling and cross-built.
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Reviewed-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
+8
+4
arch/x86/include/asm/asm.h
+4
arch/x86/include/asm/asm.h
···
120
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# define CC_OUT(c) [_cc_ ## c] "=qm"
121
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#endif
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+
#ifdef __KERNEL__
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+
123
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/* Exception table entry */
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#ifdef __ASSEMBLY__
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# define _ASM_EXTABLE_HANDLE(from, to, handler) \
···
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register unsigned long current_stack_pointer asm(_ASM_SP);
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#define ASM_CALL_CONSTRAINT "+r" (current_stack_pointer)
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#endif /* __ASSEMBLY__ */
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+
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+
#endif /* __KERNEL__ */
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#endif /* _ASM_X86_ASM_H */
+4
tools/arch/x86/include/asm/asm.h
+4
tools/arch/x86/include/asm/asm.h
···
120
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# define CC_OUT(c) [_cc_ ## c] "=qm"
121
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#endif
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+
#ifdef __KERNEL__
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+
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/* Exception table entry */
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#ifdef __ASSEMBLY__
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# define _ASM_EXTABLE_HANDLE(from, to, handler) \
···
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register unsigned long current_stack_pointer asm(_ASM_SP);
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#define ASM_CALL_CONSTRAINT "+r" (current_stack_pointer)
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#endif /* __ASSEMBLY__ */
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+
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+
#endif /* __KERNEL__ */
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#endif /* _ASM_X86_ASM_H */