[PATCH v2 0/4] Introduce %rip-relative addressing to PER_CPU_VAR macro

[Uros Bizjak]

The following patch series introduces %rip-relative addressing to
PER_CPU_VAR macro. Instruction with %rip-relative address operand is
one byte shorter than its absolute address counterpart and is also
compatible with position independent executable (-fpie) build.

The first three patches are cleanups that fix various inconsistencies
throughout the assembly code.

The last patch introduces (%rip) suffix and uses it for x86_64 target,
resulting in a small code size decrease:

   text    data     bss     dec     hex filename
25510677        4386685  808388 30705750        1d48856 vmlinux-new.o
25510629        4386685  808388 30705702        1d48826 vmlinux-old.o

Patch series is against current mainline and can be applied independently
of ongoing percpu work.

v2: Introduce PER_CPU_ARG macro to conditionally enable
    segment registers in cmpxchg{8,16}b_emu.S for CONFIG_SMP.

Cc: Juergen Gross <jgross@xxxxxxxx>
Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>

Uros Bizjak (4):
  x86/percpu: Introduce PER_CPU_ARG and use it in cmpxchg{8,16}b_emu.S
  x86/percpu: Correct PER_CPU_VAR usage to include symbol and its addend
  x86/percpu, xen: Correct PER_CPU_VAR usage to include symbol and its
    addend
  x86/percpu: Introduce %rip-relative addressing to PER_CPU_VAR macro

 arch/x86/entry/calling.h      |  2 +-
 arch/x86/entry/entry_32.S     |  2 +-
 arch/x86/entry/entry_64.S     |  2 +-
 arch/x86/include/asm/percpu.h | 10 +++++++---
 arch/x86/kernel/head_64.S     |  2 +-
 arch/x86/lib/cmpxchg16b_emu.S | 12 ++++++------
 arch/x86/lib/cmpxchg8b_emu.S  | 24 ++++++++++++++++++------
 arch/x86/xen/xen-asm.S        | 10 +++++-----
 8 files changed, 40 insertions(+), 24 deletions(-)

-- 
2.41.0