Revert "x86/paravirt: Work around GCC inlining bugs when compiling paravirt ops"

This reverts commit 494b5168f2de009eb80f198f668da374295098dd.

See this commit for details about the revert:

e769742d3584 ("Revert "x86/jump-labels: Macrofy inline assembly code to work around GCC inlining bugs"")

Reported-by: Masahiro Yamada <[e-mail]>
Reviewed-by: Borislav Petkov <[e-mail]>
Reviewed-by: Thomas Gleixner <[e-mail]>
Cc: Juergen Gross <[e-mail]>
Cc: Richard Biener <[e-mail]>
Cc: Kees Cook <[e-mail]>
Cc: Segher Boessenkool <[e-mail]>
Cc: Ard Biesheuvel <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Josh Poimboeuf <[e-mail]>
Cc: Nadav Amit <[e-mail]>
Cc: Linus Torvalds <[e-mail]>
Cc: [e-mail]
Signed-off-by: Ingo Molnar <[e-mail]>

arch/x86/include/asm/paravirt_types.h

···
 #define paravirt_clobber(clobber)		\
 	[paravirt_clobber] "i" (clobber)
 
+/*
+ * Generate some code, and mark it as patchable by the
+ * apply_paravirt() alternate instruction patcher.
+ */
+#define _paravirt_alt(insn_string, type, clobber)	\
+	"771:\n\t" insn_string "\n" "772:\n"		\
+	".pushsection .parainstructions,\"a\"\n"	\
+	_ASM_ALIGN "\n"					\
+	_ASM_PTR " 771b\n"				\
+	"  .byte " type "\n"				\
+	"  .byte 772b-771b\n"				\
+	"  .short " clobber "\n"			\
+	".popsection\n"
+
 /* Generate patchable code, with the default asm parameters. */
-#define paravirt_call							\
-	"PARAVIRT_CALL type=\"%c[paravirt_typenum]\""			\
-	" clobber=\"%c[paravirt_clobber]\""				\
-	" pv_opptr=\"%c[paravirt_opptr]\";"
+#define paravirt_alt(insn_string)					\
+	_paravirt_alt(insn_string, "%c[paravirt_typenum]", "%c[paravirt_clobber]")
 
 /* Simple instruction patching code. */
 #define NATIVE_LABEL(a,x,b) "\n\t.globl " a #x "_" #b "\n" a #x "_" #b ":\n\t"
···
 unsigned native_patch(u8 type, void *ibuf, unsigned long addr, unsigned len);
 
 int paravirt_disable_iospace(void);
+
+/*
+ * This generates an indirect call based on the operation type number.
+ * The type number, computed in PARAVIRT_PATCH, is derived from the
+ * offset into the paravirt_patch_template structure, and can therefore be
+ * freely converted back into a structure offset.
+ */
+#define PARAVIRT_CALL					\
+	ANNOTATE_RETPOLINE_SAFE				\
+	"call *%c[paravirt_opptr];"
 
 /*
  * These macros are intended to wrap calls through one of the paravirt
···
 		/* since this condition will never hold */		\
 		if (sizeof(rettype) > sizeof(unsigned long)) {		\
 			asm volatile(pre				\
-				     paravirt_call			\
+				     paravirt_alt(PARAVIRT_CALL)	\
 				     post				\
 				     : call_clbr, ASM_CALL_CONSTRAINT	\
 				     : paravirt_type(op),		\
···
 			__ret = (rettype)((((u64)__edx) << 32) | __eax); \
 		} else {						\
 			asm volatile(pre				\
-				     paravirt_call			\
+				     paravirt_alt(PARAVIRT_CALL)	\
 				     post				\
 				     : call_clbr, ASM_CALL_CONSTRAINT	\
 				     : paravirt_type(op),		\
···
 		PVOP_VCALL_ARGS;					\
 		PVOP_TEST_NULL(op);					\
 		asm volatile(pre					\
-			     paravirt_call				\
+			     paravirt_alt(PARAVIRT_CALL)		\
 			     post					\
 			     : call_clbr, ASM_CALL_CONSTRAINT		\
 			     : paravirt_type(op),			\
···
 
 extern struct paravirt_patch_site __parainstructions[],
 	__parainstructions_end[];
-
-#else	/* __ASSEMBLY__ */
-
-/*
- * This generates an indirect call based on the operation type number.
- * The type number, computed in PARAVIRT_PATCH, is derived from the
- * offset into the paravirt_patch_template structure, and can therefore be
- * freely converted back into a structure offset.
- */
-.macro PARAVIRT_CALL type:req clobber:req pv_opptr:req
-771:	ANNOTATE_RETPOLINE_SAFE
-	call *\pv_opptr
-772:	.pushsection .parainstructions,"a"
-	_ASM_ALIGN
-	_ASM_PTR 771b
-	.byte \type
-	.byte 772b-771b
-	.short \clobber
-	.popsection
-.endm
 
 #endif	/* __ASSEMBLY__ */
 

arch/x86/kernel/macros.S

···
 #include <asm/refcount.h>
 #include <asm/alternative-asm.h>
 #include <asm/bug.h>
-#include <asm/paravirt.h>