linux-kernel - [tip: objtool/core] x86/asm: Fixup odd GEN-for-each-reg.h usage

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Date:   Fri, 29 Oct 2021 08:03:01 -0000
From:   "tip-bot2 for Peter Zijlstra" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Borislav Petkov <bp@...e.de>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: objtool/core] x86/asm: Fixup odd GEN-for-each-reg.h usage

The following commit has been merged into the objtool/core branch of tip:

Commit-ID:     b6d3d9944bd7c9e8c06994ead3c9952f673f2a66
Gitweb:        https://git.kernel.org/tip/b6d3d9944bd7c9e8c06994ead3c9952f673f2a66
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Tue, 26 Oct 2021 14:01:39 +02:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Thu, 28 Oct 2021 23:25:26 +02:00

x86/asm: Fixup odd GEN-for-each-reg.h usage

Currently GEN-for-each-reg.h usage leaves GEN defined, relying on any
subsequent usage to start with #undef, which is rude.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Borislav Petkov <bp@...e.de>
Acked-by: Josh Poimboeuf <jpoimboe@...hat.com>
Tested-by: Alexei Starovoitov <ast@...nel.org>
Link: https://lore.kernel.org/r/20211026120310.041792350@infradead.org
---
 arch/x86/include/asm/asm-prototypes.h | 2 +-
 arch/x86/lib/retpoline.S              | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/asm-prototypes.h b/arch/x86/include/asm/asm-prototypes.h
index a28c5ca..a2bed09 100644
--- a/arch/x86/include/asm/asm-prototypes.h
+++ b/arch/x86/include/asm/asm-prototypes.h
@@ -19,9 +19,9 @@ extern void cmpxchg8b_emu(void);
 
 #ifdef CONFIG_RETPOLINE
 
-#undef GEN
 #define GEN(reg) \
 	extern asmlinkage void __x86_indirect_thunk_ ## reg (void);
 #include <asm/GEN-for-each-reg.h>
+#undef GEN
 
 #endif /* CONFIG_RETPOLINE */
diff --git a/arch/x86/lib/retpoline.S b/arch/x86/lib/retpoline.S
index a91e0dc..4c910fa 100644
--- a/arch/x86/lib/retpoline.S
+++ b/arch/x86/lib/retpoline.S
@@ -55,10 +55,10 @@ SYM_FUNC_END(__x86_indirect_thunk_\reg)
 #define __EXPORT_THUNK(sym)	_ASM_NOKPROBE(sym); EXPORT_SYMBOL(sym)
 #define EXPORT_THUNK(reg)	__EXPORT_THUNK(__x86_indirect_thunk_ ## reg)
 
-#undef GEN
 #define GEN(reg) THUNK reg
 #include <asm/GEN-for-each-reg.h>
-
 #undef GEN
+
 #define GEN(reg) EXPORT_THUNK(reg)
 #include <asm/GEN-for-each-reg.h>
+#undef GEN