[PATCH 5.15.y] compiler: remove __ADDRESSABLE_ASM{_STR,}() again

[Sasha Levin <sashal@kernel.org>]

From: Jan Beulich <jbeulich@suse.com>

[ Upstream commit 8ea815399c3fcce1889bd951fec25b5b9a3979c1 ]

__ADDRESSABLE_ASM_STR() is where the necessary stringification happens.
As long as "sym" doesn't contain any odd characters, no quoting is
required for its use with .quad / .long. In fact the quotation gets in
the way with gas 2.25; it's only from 2.26 onwards that quoted symbols
are half-way properly supported.

However, assembly being different from C anyway, drop
__ADDRESSABLE_ASM_STR() and its helper macro altogether. A simple
.global directive will suffice to get the symbol "declared", i.e. into
the symbol table. While there also stop open-coding STATIC_CALL_TRAMP()
and STATIC_CALL_KEY().

Fixes: 0ef8047b737d ("x86/static-call: provide a way to do very early static-call updates")
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Josh Poimboeuf <jpoimboe@kernel.org>
Cc: stable@vger.kernel.org
Signed-off-by: Juergen Gross <jgross@suse.com>
Message-ID: <609d2c74-de13-4fae-ab1a-1ec44afb948d@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/x86/include/asm/xen/hypercall.h | 6 ++++--
 include/linux/compiler.h             | 8 --------
 2 files changed, 4 insertions(+), 10 deletions(-)

diff --git a/arch/x86/include/asm/xen/hypercall.h b/arch/x86/include/asm/xen/hypercall.h
index 89cd98693efc..019fc7f78d53 100644
--- a/arch/x86/include/asm/xen/hypercall.h
+++ b/arch/x86/include/asm/xen/hypercall.h
@@ -37,6 +37,7 @@
 #include <linux/spinlock.h>
 #include <linux/errno.h>
 #include <linux/string.h>
+#include <linux/stringify.h>
 #include <linux/types.h>
 #include <linux/pgtable.h>
 #include <linux/instrumentation.h>
@@ -94,12 +95,13 @@ DECLARE_STATIC_CALL(xen_hypercall, xen_hypercall_func);
 #ifdef MODULE
 #define __ADDRESSABLE_xen_hypercall
 #else
-#define __ADDRESSABLE_xen_hypercall __ADDRESSABLE_ASM_STR(__SCK__xen_hypercall)
+#define __ADDRESSABLE_xen_hypercall \
+	__stringify(.global STATIC_CALL_KEY(xen_hypercall);)
 #endif
 
 #define __HYPERCALL					\
 	__ADDRESSABLE_xen_hypercall			\
-	"call __SCT__xen_hypercall"
+	__stringify(call STATIC_CALL_TRAMP(xen_hypercall))
 
 #define __HYPERCALL_ENTRY(x)	"a" (x)
 
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index 65c9c0d92f49..4f03dfb6de0d 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -249,14 +249,6 @@ static inline void *offset_to_ptr(const int *off)
 	static void * __section(".discard.addressable") __used \
 		__UNIQUE_ID(__PASTE(__addressable_,sym)) = (void *)&sym;
 
-#define __ADDRESSABLE_ASM(sym)						\
-	.pushsection .discard.addressable,"aw";				\
-	.align ARCH_SEL(8,4);						\
-	ARCH_SEL(.quad, .long) __stringify(sym);			\
-	.popsection;
-
-#define __ADDRESSABLE_ASM_STR(sym) __stringify(__ADDRESSABLE_ASM(sym))
-
 /* &a[0] degrades to a pointer: a different type from an array */
 #define __must_be_array(a)	BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
 
-- 
2.50.1