x86/asm: Provide a Kconfig symbol for disabling old assembly annotations

As x86 was converted to use the modern SYM_ annotations for assembly,
ifdefs were added to remove the generic definitions of the old style
annotations on x86. Rather than collect a list of architectures in the
ifdefs as more architectures are converted over, provide a Kconfig
symbol for this and update x86 to use it.
Signed-off-by: NMark Brown <broonie@kernel.org>
Signed-off-by: NBorislav Petkov <bp@suse.de>
Acked-by: NJiri Slaby <jslaby@suse.cz>
Link: https://lkml.kernel.org/r/20200416182402.6206-1-broonie@kernel.org

arch/x86/Kconfig

@@ -91,6 +91,7 @@ config X86
 	select ARCH_USE_BUILTIN_BSWAP
 	select ARCH_USE_QUEUED_RWLOCKS
 	select ARCH_USE_QUEUED_SPINLOCKS
+	select ARCH_USE_SYM_ANNOTATIONS
 	select ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
 	select ARCH_WANT_DEFAULT_BPF_JIT	if X86_64
 	select ARCH_WANTS_DYNAMIC_TASK_STRUCT

include/linux/linkage.h

@@ -105,7 +105,7 @@
 
 /* === DEPRECATED annotations === */
 
-#ifndef CONFIG_X86
+#ifndef CONFIG_ARCH_USE_SYM_ANNOTATIONS
 #ifndef GLOBAL
 /* deprecated, use SYM_DATA*, SYM_ENTRY, or similar */
 #define GLOBAL(name) \
@@ -118,10 +118,10 @@
 #define ENTRY(name) \
 	SYM_FUNC_START(name)
 #endif
-#endif /* CONFIG_X86 */
+#endif /* CONFIG_ARCH_USE_SYM_ANNOTATIONS */
 #endif /* LINKER_SCRIPT */
 
-#ifndef CONFIG_X86
+#ifndef CONFIG_ARCH_USE_SYM_ANNOTATIONS
 #ifndef WEAK
 /* deprecated, use SYM_FUNC_START_WEAK* */
 #define WEAK(name)	   \
@@ -143,7 +143,7 @@
 #define ENDPROC(name) \
 	SYM_FUNC_END(name)
 #endif
-#endif /* CONFIG_X86 */
+#endif /* CONFIG_ARCH_USE_SYM_ANNOTATIONS */
 
 /* === generic annotations === */
 

lib/Kconfig

@@ -80,6 +80,9 @@ config ARCH_USE_CMPXCHG_LOCKREF
 config ARCH_HAS_FAST_MULTIPLIER
 	bool
 
+config ARCH_USE_SYM_ANNOTATIONS
+	bool
+
 config INDIRECT_PIO
 	bool "Access I/O in non-MMIO mode"
 	depends on ARM64