[v3,01/11] x86/percpu: Introduce size abstraction macros
diff mbox series

Message ID 20200720204925.3654302-2-ndesaulniers@google.com
State In Next
Commit 4d0b3d6f2c1f4a779565bc9c858c754406ab5c27
Headers show
Series
  • i386 Clang support
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Commit Message

Nick Desaulniers July 20, 2020, 8:49 p.m. UTC
From: Brian Gerst <brgerst@gmail.com>

In preparation for cleaning up the percpu operations, define macros for
abstraction based on the width of the operation.

Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
---
 arch/x86/include/asm/percpu.h | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

Patch
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diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h
index 2278797c769d..19838e4f7a8f 100644
--- a/arch/x86/include/asm/percpu.h
+++ b/arch/x86/include/asm/percpu.h
@@ -87,6 +87,36 @@ 
  * don't give an lvalue though). */
 extern void __bad_percpu_size(void);
 
+#define __pcpu_type_1 u8
+#define __pcpu_type_2 u16
+#define __pcpu_type_4 u32
+#define __pcpu_type_8 u64
+
+#define __pcpu_cast_1(val) ((u8)(((unsigned long) val) & 0xff))
+#define __pcpu_cast_2(val) ((u16)(((unsigned long) val) & 0xffff))
+#define __pcpu_cast_4(val) ((u32)(((unsigned long) val) & 0xffffffff))
+#define __pcpu_cast_8(val) ((u64)(val))
+
+#define __pcpu_op1_1(op, dst) op "b " dst
+#define __pcpu_op1_2(op, dst) op "w " dst
+#define __pcpu_op1_4(op, dst) op "l " dst
+#define __pcpu_op1_8(op, dst) op "q " dst
+
+#define __pcpu_op2_1(op, src, dst) op "b " src ", " dst
+#define __pcpu_op2_2(op, src, dst) op "w " src ", " dst
+#define __pcpu_op2_4(op, src, dst) op "l " src ", " dst
+#define __pcpu_op2_8(op, src, dst) op "q " src ", " dst
+
+#define __pcpu_reg_1(mod, x) mod "q" (x)
+#define __pcpu_reg_2(mod, x) mod "r" (x)
+#define __pcpu_reg_4(mod, x) mod "r" (x)
+#define __pcpu_reg_8(mod, x) mod "r" (x)
+
+#define __pcpu_reg_imm_1(x) "qi" (x)
+#define __pcpu_reg_imm_2(x) "ri" (x)
+#define __pcpu_reg_imm_4(x) "ri" (x)
+#define __pcpu_reg_imm_8(x) "re" (x)
+
 #define percpu_to_op(qual, op, var, val)		\
 do {							\
 	typedef typeof(var) pto_T__;			\