diff options
Diffstat (limited to 'ANDROID_3.4.5/include/linux/percpu-defs.h')
| -rw-r--r-- | ANDROID_3.4.5/include/linux/percpu-defs.h | 163 |
1 files changed, 0 insertions, 163 deletions
diff --git a/ANDROID_3.4.5/include/linux/percpu-defs.h b/ANDROID_3.4.5/include/linux/percpu-defs.h deleted file mode 100644 index 27ef6b19..00000000 --- a/ANDROID_3.4.5/include/linux/percpu-defs.h +++ /dev/null @@ -1,163 +0,0 @@ -#ifndef _LINUX_PERCPU_DEFS_H -#define _LINUX_PERCPU_DEFS_H - -/* - * Base implementations of per-CPU variable declarations and definitions, where - * the section in which the variable is to be placed is provided by the - * 'sec' argument. This may be used to affect the parameters governing the - * variable's storage. - * - * NOTE! The sections for the DECLARE and for the DEFINE must match, lest - * linkage errors occur due the compiler generating the wrong code to access - * that section. - */ -#define __PCPU_ATTRS(sec) \ - __percpu __attribute__((section(PER_CPU_BASE_SECTION sec))) \ - PER_CPU_ATTRIBUTES - -#define __PCPU_DUMMY_ATTRS \ - __attribute__((section(".discard"), unused)) - -/* - * Macro which verifies @ptr is a percpu pointer without evaluating - * @ptr. This is to be used in percpu accessors to verify that the - * input parameter is a percpu pointer. - */ -#define __verify_pcpu_ptr(ptr) do { \ - const void __percpu *__vpp_verify = (typeof(ptr))NULL; \ - (void)__vpp_verify; \ -} while (0) - -/* - * s390 and alpha modules require percpu variables to be defined as - * weak to force the compiler to generate GOT based external - * references for them. This is necessary because percpu sections - * will be located outside of the usually addressable area. - * - * This definition puts the following two extra restrictions when - * defining percpu variables. - * - * 1. The symbol must be globally unique, even the static ones. - * 2. Static percpu variables cannot be defined inside a function. - * - * Archs which need weak percpu definitions should define - * ARCH_NEEDS_WEAK_PER_CPU in asm/percpu.h when necessary. - * - * To ensure that the generic code observes the above two - * restrictions, if CONFIG_DEBUG_FORCE_WEAK_PER_CPU is set weak - * definition is used for all cases. - */ -#if defined(ARCH_NEEDS_WEAK_PER_CPU) || defined(CONFIG_DEBUG_FORCE_WEAK_PER_CPU) -/* - * __pcpu_scope_* dummy variable is used to enforce scope. It - * receives the static modifier when it's used in front of - * DEFINE_PER_CPU() and will trigger build failure if - * DECLARE_PER_CPU() is used for the same variable. - * - * __pcpu_unique_* dummy variable is used to enforce symbol uniqueness - * such that hidden weak symbol collision, which will cause unrelated - * variables to share the same address, can be detected during build. - */ -#define DECLARE_PER_CPU_SECTION(type, name, sec) \ - extern __PCPU_DUMMY_ATTRS char __pcpu_scope_##name; \ - extern __PCPU_ATTRS(sec) __typeof__(type) name - -#define DEFINE_PER_CPU_SECTION(type, name, sec) \ - __PCPU_DUMMY_ATTRS char __pcpu_scope_##name; \ - extern __PCPU_DUMMY_ATTRS char __pcpu_unique_##name; \ - __PCPU_DUMMY_ATTRS char __pcpu_unique_##name; \ - __PCPU_ATTRS(sec) PER_CPU_DEF_ATTRIBUTES __weak \ - __typeof__(type) name -#else -/* - * Normal declaration and definition macros. - */ -#define DECLARE_PER_CPU_SECTION(type, name, sec) \ - extern __PCPU_ATTRS(sec) __typeof__(type) name - -#define DEFINE_PER_CPU_SECTION(type, name, sec) \ - __PCPU_ATTRS(sec) PER_CPU_DEF_ATTRIBUTES \ - __typeof__(type) name -#endif - -/* - * Variant on the per-CPU variable declaration/definition theme used for - * ordinary per-CPU variables. - */ -#define DECLARE_PER_CPU(type, name) \ - DECLARE_PER_CPU_SECTION(type, name, "") - -#define DEFINE_PER_CPU(type, name) \ - DEFINE_PER_CPU_SECTION(type, name, "") - -/* - * Declaration/definition used for per-CPU variables that must come first in - * the set of variables. - */ -#define DECLARE_PER_CPU_FIRST(type, name) \ - DECLARE_PER_CPU_SECTION(type, name, PER_CPU_FIRST_SECTION) - -#define DEFINE_PER_CPU_FIRST(type, name) \ - DEFINE_PER_CPU_SECTION(type, name, PER_CPU_FIRST_SECTION) - -/* - * Declaration/definition used for per-CPU variables that must be cacheline - * aligned under SMP conditions so that, whilst a particular instance of the - * data corresponds to a particular CPU, inefficiencies due to direct access by - * other CPUs are reduced by preventing the data from unnecessarily spanning - * cachelines. - * - * An example of this would be statistical data, where each CPU's set of data - * is updated by that CPU alone, but the data from across all CPUs is collated - * by a CPU processing a read from a proc file. - */ -#define DECLARE_PER_CPU_SHARED_ALIGNED(type, name) \ - DECLARE_PER_CPU_SECTION(type, name, PER_CPU_SHARED_ALIGNED_SECTION) \ - ____cacheline_aligned_in_smp - -#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \ - DEFINE_PER_CPU_SECTION(type, name, PER_CPU_SHARED_ALIGNED_SECTION) \ - ____cacheline_aligned_in_smp - -#define DECLARE_PER_CPU_ALIGNED(type, name) \ - DECLARE_PER_CPU_SECTION(type, name, PER_CPU_ALIGNED_SECTION) \ - ____cacheline_aligned - -#define DEFINE_PER_CPU_ALIGNED(type, name) \ - DEFINE_PER_CPU_SECTION(type, name, PER_CPU_ALIGNED_SECTION) \ - ____cacheline_aligned - -/* - * Declaration/definition used for per-CPU variables that must be page aligned. - */ -#define DECLARE_PER_CPU_PAGE_ALIGNED(type, name) \ - DECLARE_PER_CPU_SECTION(type, name, "..page_aligned") \ - __aligned(PAGE_SIZE) - -#define DEFINE_PER_CPU_PAGE_ALIGNED(type, name) \ - DEFINE_PER_CPU_SECTION(type, name, "..page_aligned") \ - __aligned(PAGE_SIZE) - -/* - * Declaration/definition used for per-CPU variables that must be read mostly. - */ -#define DECLARE_PER_CPU_READ_MOSTLY(type, name) \ - DECLARE_PER_CPU_SECTION(type, name, "..readmostly") - -#define DEFINE_PER_CPU_READ_MOSTLY(type, name) \ - DEFINE_PER_CPU_SECTION(type, name, "..readmostly") - -/* - * Intermodule exports for per-CPU variables. sparse forgets about - * address space across EXPORT_SYMBOL(), change EXPORT_SYMBOL() to - * noop if __CHECKER__. - */ -#ifndef __CHECKER__ -#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(var) -#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(var) -#else -#define EXPORT_PER_CPU_SYMBOL(var) -#define EXPORT_PER_CPU_SYMBOL_GPL(var) -#endif - -#endif /* _LINUX_PERCPU_DEFS_H */ |