arm64: use local label prefixes for __reg_num symbols

The __reg_num_xNN symbols that are used to implement the msr_s and mrs_s macros are recorded in the ELF metadata of each object file. This is not a problem in terms of code size, but it does clobber

the output of tools like readelf, i.e.,

  $ readelf -a vmlinux |grep __reg_num_x | wc -l
  50976

So let's use symbols with the .L prefix, these are strictly local, and don't end up in the object files.

  $ readelf -a vmlinux |grep __reg_num_x | wc -l
  0

Signed-off-by Ard Biesheuvel <[email protected]>

---
 arch/arm64/include/asm/sysreg.h | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

arch/arm64/include/asm/sysreg.h +8 -9

index 4aeebec3d882..7d771ac01289 100644
@@ -196,16 +196,16 @@
 #ifdef __ASSEMBLY__
 
        .irp    num,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30
-       .equ    __reg_num_x\num, \num
+       .equ    .L__reg_num_x\num, \num
        .endr
-       .equ    __reg_num_xzr, 31
+       .equ    .L__reg_num_xzr, 31
 
        .macro  mrs_s, rt, sreg
-       .inst   0xd5200000|(\sreg)|(__reg_num_\rt)
+       .inst   0xd5200000|(\sreg)|(.L__reg_num_\rt)
        .endm
 
        .macro  msr_s, sreg, rt
-       .inst   0xd5000000|(\sreg)|(__reg_num_\rt)
+       .inst   0xd5000000|(\sreg)|(.L__reg_num_\rt)
        .endm
 
 #else

@@ -214,16 +214,16 @@
 
 asm(
 "      .irp    num,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30\n"
-"      .equ    __reg_num_x\\num, \\num\n"
+"      .equ    .L__reg_num_x\\num, \\num\n"
 "      .endr\n"
-"      .equ    __reg_num_xzr, 31\n"
+"      .equ    .L__reg_num_xzr, 31\n"
 "\n"
 "      .macro  mrs_s, rt, sreg\n"
-"      .inst   0xd5200000|(\\sreg)|(__reg_num_\\rt)\n"
+"      .inst   0xd5200000|(\\sreg)|(.L__reg_num_\\rt)\n"
 "      .endm\n"
 "\n"
 "      .macro  msr_s, sreg, rt\n"
-"      .inst   0xd5000000|(\\sreg)|(__reg_num_\\rt)\n"
+"      .inst   0xd5000000|(\\sreg)|(.L__reg_num_\\rt)\n"
 "      .endm\n"
 );
 
--

2.5.0

The __reg_num_xNN symbols that are used to implement the msr_s and mrs_s macros are recorded in the ELF metadata of each object file. This is not a problem in terms of code size, but it does clobber the output of tools like readelf, i.e.,

  $ readelf -a vmlinux |grep __reg_num_x | wc -l
  50976

So let's use symbols with the .L prefix, these are strictly local, and don't end up in the object files.

  $ readelf -a vmlinux |grep __reg_num_x | wc -l
  0

Signed-off-by Ard Biesheuvel <[email protected]>

---
 arch/arm64/include/asm/sysreg.h | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)