linux-kernel - [tip: x86/asm] x86/asm: Make <asm/asm.h> valid on cross-builds as well

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Date:   Thu, 13 May 2021 12:06:23 -0000
From:   "tip-bot2 for Ingo Molnar" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Ingo Molnar <mingo@...nel.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/asm] x86/asm: Make <asm/asm.h> valid on cross-builds as well

The following commit has been merged into the x86/asm branch of tip:

Commit-ID:     4173d63a75ce47de95ce5406d8adab9005826def
Gitweb:        https://git.kernel.org/tip/4173d63a75ce47de95ce5406d8adab9005826def
Author:        Ingo Molnar <mingo@...nel.org>
AuthorDate:    Thu, 13 May 2021 13:41:41 +02:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Thu, 13 May 2021 13:45:04 +02:00

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@...b.auug.org.au>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/include/asm/asm.h       | 4 ++++
 tools/arch/x86/include/asm/asm.h | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/arch/x86/include/asm/asm.h b/arch/x86/include/asm/asm.h
index 507a37a..3ad3da9 100644
--- a/arch/x86/include/asm/asm.h
+++ b/arch/x86/include/asm/asm.h
@@ -120,6 +120,8 @@
 # define CC_OUT(c) [_cc_ ## c] "=qm"
 #endif
 
+#ifdef __KERNEL__
+
 /* Exception table entry */
 #ifdef __ASSEMBLY__
 # define _ASM_EXTABLE_HANDLE(from, to, handler)			\
@@ -186,4 +188,6 @@ register unsigned long current_stack_pointer asm(_ASM_SP);
 #define ASM_CALL_CONSTRAINT "+r" (current_stack_pointer)
 #endif /* __ASSEMBLY__ */
 
+#endif /* __KERNEL__ */
+
 #endif /* _ASM_X86_ASM_H */
diff --git a/tools/arch/x86/include/asm/asm.h b/tools/arch/x86/include/asm/asm.h
index 507a37a..3ad3da9 100644
--- a/tools/arch/x86/include/asm/asm.h
+++ b/tools/arch/x86/include/asm/asm.h
@@ -120,6 +120,8 @@
 # define CC_OUT(c) [_cc_ ## c] "=qm"
 #endif
 
+#ifdef __KERNEL__
+
 /* Exception table entry */
 #ifdef __ASSEMBLY__
 # define _ASM_EXTABLE_HANDLE(from, to, handler)			\
@@ -186,4 +188,6 @@ register unsigned long current_stack_pointer asm(_ASM_SP);
 #define ASM_CALL_CONSTRAINT "+r" (current_stack_pointer)
 #endif /* __ASSEMBLY__ */
 
+#endif /* __KERNEL__ */
+
 #endif /* _ASM_X86_ASM_H */