| From: |
| Uros Bizjak <ubizjak-AT-gmail.com> |
| To: |
| x86-AT-kernel.org, xen-devel-AT-lists.xenproject.org, linux-kernel-AT-vger.kernel.org |
| Subject: |
| [PATCH 0/4] [PATCH 0/4] Introduce %rip-relative addressing to PER_CPU_VAR macro |
| Date: |
| Thu, 12 Oct 2023 18:10:35 +0200 |
| Message-ID: |
| <20231012161237.114733-1-ubizjak@gmail.com> |
| Cc: |
| Uros Bizjak <ubizjak-AT-gmail.com>, Juergen Gross <jgross-AT-suse.com>, Boris Ostrovsky <boris.ostrovsky-AT-oracle.com>, Thomas Gleixner <tglx-AT-linutronix.de>, Ingo Molnar <mingo-AT-redhat.com>, Borislav Petkov <bp-AT-alien8.de>, Dave Hansen <dave.hansen-AT-linux.intel.com>, "H. Peter Anvin" <hpa-AT-zytor.com> |
| Archive-link: |
| Article |
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 <jgross@suse.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "H. Peter Anvin" <hpa@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
