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authorJan Beulich <JBeulich@suse.com>2014-11-04 09:50:48 +0100
committerThomas Gleixner <tglx@linutronix.de>2014-11-04 20:43:14 +0100
commit97b67ae559947f1e208439a1bf6a734da3087006 (patch)
treee0a75ea8c5eddf24755fbb1d9f30c6715c935c96 /arch/x86/include
parentx86-64: Handle PC-relative relocations on per-CPU data (diff)
downloadlinux-97b67ae559947f1e208439a1bf6a734da3087006.tar.xz
linux-97b67ae559947f1e208439a1bf6a734da3087006.zip
x86-64: Use RIP-relative addressing for most per-CPU accesses
Observing that per-CPU data (in the SMP case) is reachable by exploiting 64-bit address wraparound (building on the default kernel load address being at 16Mb), the one byte shorter RIP-relative addressing form can be used for most per-CPU accesses. The one exception are the "stable" reads, where the use of the "P" operand modifier prevents the compiler from using RIP-relative addressing, but is unavoidable due to the use of the "p" constraint (side note: with gcc 4.9.x the intended effect of this isn't being achieved anymore, see gcc bug 63637). With the dependency on the minimum kernel load address, arbitrarily low values for CONFIG_PHYSICAL_START are now no longer possible. A link time assertion is being added, directing to the need to increase that value when it triggers. Signed-off-by: Jan Beulich <jbeulich@suse.com> Link: http://lkml.kernel.org/r/5458A1780200007800044A9D@mail.emea.novell.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/include')
-rw-r--r--arch/x86/include/asm/percpu.h59
1 files changed, 44 insertions, 15 deletions
diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h
index 74da3178d776..e0ba66ca68c6 100644
--- a/arch/x86/include/asm/percpu.h
+++ b/arch/x86/include/asm/percpu.h
@@ -64,7 +64,7 @@
#define __percpu_prefix ""
#endif
-#define __percpu_arg(x) __percpu_prefix "%P" #x
+#define __percpu_arg(x) __percpu_prefix "%" #x
/*
* Initialized pointers to per-cpu variables needed for the boot
@@ -179,29 +179,58 @@ do { \
} \
} while (0)
-#define percpu_from_op(op, var, constraint) \
+#define percpu_from_op(op, var) \
({ \
typeof(var) pfo_ret__; \
switch (sizeof(var)) { \
case 1: \
asm(op "b "__percpu_arg(1)",%0" \
: "=q" (pfo_ret__) \
- : constraint); \
+ : "m" (var)); \
break; \
case 2: \
asm(op "w "__percpu_arg(1)",%0" \
: "=r" (pfo_ret__) \
- : constraint); \
+ : "m" (var)); \
break; \
case 4: \
asm(op "l "__percpu_arg(1)",%0" \
: "=r" (pfo_ret__) \
- : constraint); \
+ : "m" (var)); \
break; \
case 8: \
asm(op "q "__percpu_arg(1)",%0" \
: "=r" (pfo_ret__) \
- : constraint); \
+ : "m" (var)); \
+ break; \
+ default: __bad_percpu_size(); \
+ } \
+ pfo_ret__; \
+})
+
+#define percpu_stable_op(op, var) \
+({ \
+ typeof(var) pfo_ret__; \
+ switch (sizeof(var)) { \
+ case 1: \
+ asm(op "b "__percpu_arg(P1)",%0" \
+ : "=q" (pfo_ret__) \
+ : "p" (&(var))); \
+ break; \
+ case 2: \
+ asm(op "w "__percpu_arg(P1)",%0" \
+ : "=r" (pfo_ret__) \
+ : "p" (&(var))); \
+ break; \
+ case 4: \
+ asm(op "l "__percpu_arg(P1)",%0" \
+ : "=r" (pfo_ret__) \
+ : "p" (&(var))); \
+ break; \
+ case 8: \
+ asm(op "q "__percpu_arg(P1)",%0" \
+ : "=r" (pfo_ret__) \
+ : "p" (&(var))); \
break; \
default: __bad_percpu_size(); \
} \
@@ -359,11 +388,11 @@ do { \
* per-thread variables implemented as per-cpu variables and thus
* stable for the duration of the respective task.
*/
-#define this_cpu_read_stable(var) percpu_from_op("mov", var, "p" (&(var)))
+#define this_cpu_read_stable(var) percpu_stable_op("mov", var)
-#define raw_cpu_read_1(pcp) percpu_from_op("mov", (pcp), "m"(pcp))
-#define raw_cpu_read_2(pcp) percpu_from_op("mov", (pcp), "m"(pcp))
-#define raw_cpu_read_4(pcp) percpu_from_op("mov", (pcp), "m"(pcp))
+#define raw_cpu_read_1(pcp) percpu_from_op("mov", pcp)
+#define raw_cpu_read_2(pcp) percpu_from_op("mov", pcp)
+#define raw_cpu_read_4(pcp) percpu_from_op("mov", pcp)
#define raw_cpu_write_1(pcp, val) percpu_to_op("mov", (pcp), val)
#define raw_cpu_write_2(pcp, val) percpu_to_op("mov", (pcp), val)
@@ -381,9 +410,9 @@ do { \
#define raw_cpu_xchg_2(pcp, val) percpu_xchg_op(pcp, val)
#define raw_cpu_xchg_4(pcp, val) percpu_xchg_op(pcp, val)
-#define this_cpu_read_1(pcp) percpu_from_op("mov", (pcp), "m"(pcp))
-#define this_cpu_read_2(pcp) percpu_from_op("mov", (pcp), "m"(pcp))
-#define this_cpu_read_4(pcp) percpu_from_op("mov", (pcp), "m"(pcp))
+#define this_cpu_read_1(pcp) percpu_from_op("mov", pcp)
+#define this_cpu_read_2(pcp) percpu_from_op("mov", pcp)
+#define this_cpu_read_4(pcp) percpu_from_op("mov", pcp)
#define this_cpu_write_1(pcp, val) percpu_to_op("mov", (pcp), val)
#define this_cpu_write_2(pcp, val) percpu_to_op("mov", (pcp), val)
#define this_cpu_write_4(pcp, val) percpu_to_op("mov", (pcp), val)
@@ -435,7 +464,7 @@ do { \
* 32 bit must fall back to generic operations.
*/
#ifdef CONFIG_X86_64
-#define raw_cpu_read_8(pcp) percpu_from_op("mov", (pcp), "m"(pcp))
+#define raw_cpu_read_8(pcp) percpu_from_op("mov", pcp)
#define raw_cpu_write_8(pcp, val) percpu_to_op("mov", (pcp), val)
#define raw_cpu_add_8(pcp, val) percpu_add_op((pcp), val)
#define raw_cpu_and_8(pcp, val) percpu_to_op("and", (pcp), val)
@@ -444,7 +473,7 @@ do { \
#define raw_cpu_xchg_8(pcp, nval) percpu_xchg_op(pcp, nval)
#define raw_cpu_cmpxchg_8(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval)
-#define this_cpu_read_8(pcp) percpu_from_op("mov", (pcp), "m"(pcp))
+#define this_cpu_read_8(pcp) percpu_from_op("mov", pcp)
#define this_cpu_write_8(pcp, val) percpu_to_op("mov", (pcp), val)
#define this_cpu_add_8(pcp, val) percpu_add_op((pcp), val)
#define this_cpu_and_8(pcp, val) percpu_to_op("and", (pcp), val)