[PATCH] arm64/debug: don't duplicate filenames.

[Jamie Iles]

Rather than explicitly pushing the filename into .rodata.str, use a
compiler generated string literal and use the address of that as an
input constraint to the inline assembly.  This allows the compiler to
emit only one version of the string without relying on the linker to
deduplicate.

Cc: Dave P Martin <Dave.Martin at arm.com>
Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: Will Deacon <will.deacon at arm.com>
Signed-off-by: Jamie Iles <jamie.iles at oracle.com>
---
 arch/arm64/include/asm/bug.h | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/arch/arm64/include/asm/bug.h b/arch/arm64/include/asm/bug.h
index a02a57186f56..a7b05625ef63 100644
--- a/arch/arm64/include/asm/bug.h
+++ b/arch/arm64/include/asm/bug.h
@@ -23,12 +23,8 @@
 #ifdef CONFIG_DEBUG_BUGVERBOSE
 #define _BUGVERBOSE_LOCATION(file, line) __BUGVERBOSE_LOCATION(file, line)
 #define __BUGVERBOSE_LOCATION(file, line)				\
-		".pushsection .rodata.str,\"aMS\", at progbits,1\n"	\
-	"2:	.string \"" file "\"\n\t"				\
-		".popsection\n\t"					\
-									\
-		".long 2b - 0b\n\t"					\
-		".short " #line "\n\t"
+		".long %[file] - 0b\n\t"				\
+		".short %[line]\n\t"
 #else
 #define _BUGVERBOSE_LOCATION(file, line)
 #endif
@@ -50,7 +46,9 @@ _BUGVERBOSE_LOCATION(__FILE__, __LINE__)		\
 #define __BUG_FLAGS(flags)				\
 	asm volatile (					\
 		__BUG_ENTRY(flags)			\
-		"brk %[imm]" :: [imm] "i" (BUG_BRK_IMM)	\
+		"brk %[imm]" :: [imm] "i" (BUG_BRK_IMM),\
+			        [line] "i" (__LINE__),  \
+			        [file] "i" (__FILE__)   \
 	);
 
 
-- 
2.15.0