| Message ID | 20231012161237.114733-5-ubizjak@gmail.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Introduce %rip-relative addressing to PER_CPU_VAR macro | expand |
diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h index 34734d730463..9a5f1896c5ef 100644 --- a/arch/x86/include/asm/percpu.h +++ b/arch/x86/include/asm/percpu.h @@ -4,16 +4,18 @@ #ifdef CONFIG_X86_64 #define __percpu_seg gs +#define __percpu_rel (%rip) #else #define __percpu_seg fs +#define __percpu_rel #endif #ifdef __ASSEMBLY__ #ifdef CONFIG_SMP -#define PER_CPU_VAR(var) %__percpu_seg:var +#define PER_CPU_VAR(var) %__percpu_seg:(var)##__percpu_rel #else /* ! SMP */ -#define PER_CPU_VAR(var) var +#define PER_CPU_VAR(var) (var)##__percpu_rel #endif /* SMP */ #ifdef CONFIG_X86_64_SMP
Introduce x86_64 %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. 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> Cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Uros Bizjak <ubizjak@gmail.com> --- arch/x86/include/asm/percpu.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)