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 the ongoing percpu work.
Cc: Juergen Gross <jgr...@suse.com>
Cc: Boris Ostrovsky <boris.ostrov...@oracle.com>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Ingo Molnar <mi...@redhat.com>
Cc: Borislav Petkov <b...@alien8.de>
Cc: Dave Hansen <dave.han...@linux.intel.com>
Cc: "H. Peter Anvin" <h...@zytor.com>
Uros Bizjak (4):
x86/percpu: Use explicit segment registers in lib/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 | 6 ++++--
arch/x86/kernel/head_64.S | 2 +-
arch/x86/lib/cmpxchg16b_emu.S | 12 ++++++------
arch/x86/lib/cmpxchg8b_emu.S | 30 +++++++++++++++++++++---------
arch/x86/xen/xen-asm.S | 10 +++++-----
8 files changed, 40 insertions(+), 26 deletions(-)
--
2.41.0
