[PATCH 5.15 12/78] x86/asm: Fixup odd GEN-for-each-reg.h usage

Greg Kroah-Hartman
2022-07-12T19:02:47Z

From: Peter Zijlstra <peterz@infradead.org>

commit b6d3d9944bd7c9e8c06994ead3c9952f673f2a66 upstream.

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@infradead.org>
Reviewed-by: Borislav Petkov <bp@suse.de>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Tested-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/r/20211026120310.041792350@infradead.org
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/x86/include/asm/asm-prototypes.h | 2 +-
arch/x86/lib/retpoline.S | 4 ++--
2 files changed, 3 insertions(+), 3 deletions(-)

--- 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 */
--- 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