treewide: remove current_text_addr

Prefer _THIS_IP_ defined in linux/kernel.h.

Most definitions of current_text_addr were the same as _THIS_IP_, but
a few archs had inline assembly instead.

This patch removes the final call site of current_text_addr, making all
of the definitions dead code.

[akpm@linux-foundation.org: fix arch/csky/include/asm/processor.h]
Link: http://lkml.kernel.org/r/20180911182413.180715-1-ndesaulniers@google.com
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/alpha/include/asm/processor.h

@@ -10,12 +10,6 @@
 
 #include <linux/personality.h>	/* for ADDR_LIMIT_32BIT */
 
-/*
- * Returns current instruction pointer ("program counter").
- */
-#define current_text_addr() \
-  ({ void *__pc; __asm__ ("br %0,.+4" : "=r"(__pc)); __pc; })
-
 /*
  * We have a 42-bit user address space: 4TB user VM...
  */

arch/arc/include/asm/processor.h

@@ -98,14 +98,6 @@ extern void start_thread(struct pt_regs * regs, unsigned long pc,
 
 extern unsigned int get_wchan(struct task_struct *p);
 
-/*
- * Default implementation of macro that returns current
- * instruction pointer ("program counter").
- * Should the PC register be read instead ? This macro does not seem to
- * be used in many places so this wont be all that bad.
- */
-#define current_text_addr() ({ __label__ _l; _l: &&_l; })
-
 #endif /* !__ASSEMBLY__ */
 
 /*

arch/arm/include/asm/processor.h

@@ -11,12 +11,6 @@
 #ifndef __ASM_ARM_PROCESSOR_H
 #define __ASM_ARM_PROCESSOR_H
 
-/*
- * Default implementation of macro that returns current
- * instruction pointer ("program counter").
- */
-#define current_text_addr() ({ __label__ _l; _l: &&_l;})
-
 #ifdef __KERNEL__
 
 #include <asm/hw_breakpoint.h>

arch/arm64/include/asm/processor.h

@@ -25,13 +25,6 @@
 #define USER_DS		(TASK_SIZE_64 - 1)
 
 #ifndef __ASSEMBLY__
-
-/*
- * Default implementation of macro that returns current
- * instruction pointer ("program counter").
- */
-#define current_text_addr() ({ __label__ _l; _l: &&_l;})
-
 #ifdef __KERNEL__
 
 #include <linux/build_bug.h>

arch/c6x/include/asm/processor.h

@@ -17,17 +17,6 @@
 #include <asm/page.h>
 #include <asm/current.h>
 
-/*
- * Default implementation of macro that returns current
- * instruction pointer ("program counter").
- */
-#define current_text_addr()			\
-({						\
-	void *__pc;				\
-	asm("mvc .S2 pce1,%0\n" : "=b"(__pc));	\
-	__pc;					\
-})
-
 /*
  * User space process size. This is mostly meaningless for NOMMU
  * but some C6X processors may have RAM addresses up to 0xFFFFFFFF.

arch/csky/include/asm/processor.h

@@ -4,12 +4,6 @@
 #ifndef __ASM_CSKY_PROCESSOR_H
 #define __ASM_CSKY_PROCESSOR_H
 
-/*
- * Default implementation of macro that returns current
- * instruction pointer ("program counter").
- */
-#define current_text_addr() ({ __label__ _l; _l: &&_l; })
-
 #include <linux/bitops.h>
 #include <asm/segment.h>
 #include <asm/ptrace.h>

arch/h8300/include/asm/processor.h

@@ -12,12 +12,6 @@
 #ifndef __ASM_H8300_PROCESSOR_H
 #define __ASM_H8300_PROCESSOR_H
 
-/*
- * Default implementation of macro that returns current
- * instruction pointer ("program counter").
- */
-#define current_text_addr() ({ __label__ _l; _l: &&_l; })
-
 #include <linux/compiler.h>
 #include <asm/segment.h>
 #include <asm/ptrace.h>

arch/hexagon/include/asm/processor.h

@@ -27,9 +27,6 @@
 #include <asm/registers.h>
 #include <asm/hexagon_vm.h>
 
-/*  must be a macro  */
-#define current_text_addr() ({ __label__ _l; _l: &&_l; })
-
 /*  task_struct, defined elsewhere, is the "process descriptor" */
 struct task_struct;
 

arch/ia64/include/asm/processor.h

@@ -602,12 +602,6 @@ ia64_set_unat (__u64 *unat, void *spill_addr, unsigned long nat)
 	*unat = (*unat & ~mask) | (nat << bit);
 }
 
-/*
- * Get the current instruction/program counter value.
- */
-#define current_text_addr() \
-	({ void *_pc; _pc = (void *)ia64_getreg(_IA64_REG_IP); _pc; })
-
 static inline __u64
 ia64_get_ivr (void)
 {

arch/m68k/include/asm/processor.h

@@ -8,12 +8,6 @@
 #ifndef __ASM_M68K_PROCESSOR_H
 #define __ASM_M68K_PROCESSOR_H
 
-/*
- * Default implementation of macro that returns current
- * instruction pointer ("program counter").
- */
-#define current_text_addr() ({ __label__ _l; _l: &&_l;})
-
 #include <linux/thread_info.h>
 #include <asm/segment.h>
 #include <asm/fpu.h>

arch/microblaze/include/asm/processor.h

@@ -45,12 +45,6 @@ extern void ret_from_kernel_thread(void);
  */
 # define TASK_SIZE	(0x81000000 - 0x80000000)
 
-/*
- * Default implementation of macro that returns current
- * instruction pointer ("program counter").
- */
-# define current_text_addr() ({ __label__ _l; _l: &&_l; })
-
 /*
  * This decides where the kernel will search for a free chunk of vm
  * space during mmap's. We won't be using it
@@ -92,12 +86,6 @@ extern unsigned long get_wchan(struct task_struct *p);
 
 #  ifndef __ASSEMBLY__
 
-/*
- * Default implementation of macro that returns current
- * instruction pointer ("program counter").
- */
-#  define current_text_addr()	({ __label__ _l; _l: &&_l; })
-
 /* If you change this, you must change the associated assembly-languages
  * constants defined below, THREAD_*.
  */

arch/mips/include/asm/processor.h

@@ -23,11 +23,6 @@
 #include <asm/mipsregs.h>
 #include <asm/prefetch.h>
 
-/*
- * Return current * instruction pointer ("program counter").
- */
-#define current_text_addr() ({ __label__ _l; _l: &&_l;})
-
 /*
  * System setup and hardware flags..
  */

arch/nds32/include/asm/processor.h

@@ -4,12 +4,6 @@
 #ifndef __ASM_NDS32_PROCESSOR_H
 #define __ASM_NDS32_PROCESSOR_H
 
-/*
- * Default implementation of macro that returns current
- * instruction pointer ("program counter").
- */
-#define current_text_addr() ({ __label__ _l; _l: &&_l;})
-
 #ifdef __KERNEL__
 
 #include <asm/ptrace.h>

arch/nios2/include/asm/processor.h

@@ -38,12 +38,6 @@
 #define KUSER_SIZE		(PAGE_SIZE)
 #ifndef __ASSEMBLY__
 
-/*
- * Default implementation of macro that returns current
- * instruction pointer ("program counter").
- */
-#define current_text_addr() ({ __label__ _l; _l: &&_l; })
-
 # define TASK_SIZE		0x7FFF0000UL
 # define TASK_UNMAPPED_BASE	(PAGE_ALIGN(TASK_SIZE / 3))
 

arch/openrisc/include/asm/processor.h

@@ -30,11 +30,6 @@
 		   | SPR_SR_DCE | SPR_SR_SM)
 #define USER_SR   (SPR_SR_DME | SPR_SR_IME | SPR_SR_ICE \
 		   | SPR_SR_DCE | SPR_SR_IEE | SPR_SR_TEE)
-/*
- * Default implementation of macro that returns current
- * instruction pointer ("program counter").
- */
-#define current_text_addr() ({ __label__ _l; _l: &&_l; })
 
 /*
  * User space process size. This is hardcoded into a few places,

arch/parisc/include/asm/processor.h

@@ -20,17 +20,6 @@
 #include <asm/percpu.h>
 #endif /* __ASSEMBLY__ */
 
-/*
- * Default implementation of macro that returns current
- * instruction pointer ("program counter").
- */
-#ifdef CONFIG_PA20
-#define current_ia(x)	__asm__("mfia %0" : "=r"(x))
-#else /* mfia added in pa2.0 */
-#define current_ia(x)	__asm__("blr 0,%0\n\tnop" : "=r"(x))
-#endif
-#define current_text_addr() ({ void *pc; current_ia(pc); pc; })
-
 #define HAVE_ARCH_PICK_MMAP_LAYOUT
 
 #define TASK_SIZE_OF(tsk)       ((tsk)->thread.task_size)

arch/powerpc/include/asm/processor.h

@@ -67,12 +67,6 @@ extern int _chrp_type;
 
 #endif /* defined(__KERNEL__) && defined(CONFIG_PPC32) */
 
-/*
- * Default implementation of macro that returns current
- * instruction pointer ("program counter").
- */
-#define current_text_addr() ({ __label__ _l; _l: &&_l;})
-
 /* Macros for adjusting thread priority (hardware multi-threading) */
 #define HMT_very_low()   asm volatile("or 31,31,31   # very low priority")
 #define HMT_low()	 asm volatile("or 1,1,1	     # low priority")

arch/riscv/include/asm/processor.h

@@ -33,12 +33,6 @@
 struct task_struct;
 struct pt_regs;
 
-/*
- * Default implementation of macro that returns current
- * instruction pointer ("program counter").
- */
-#define current_text_addr()	({ __label__ _l; _l: &&_l; })
-
 /* CPU-specific state of a task */
 struct thread_struct {
 	/* Callee-saved registers */

arch/s390/include/asm/processor.h

@@ -73,12 +73,6 @@ static inline int test_cpu_flag_of(int flag, int cpu)
 
 #define arch_needs_cpu() test_cpu_flag(CIF_NOHZ_DELAY)
 
-/*
- * Default implementation of macro that returns current
- * instruction pointer ("program counter").
- */
-#define current_text_addr() ({ void *pc; asm("basr %0,0" : "=a" (pc)); pc; })
-
 static inline void get_cpu_id(struct cpuid *ptr)
 {
 	asm volatile("stidp %0" : "=Q" (*ptr));

arch/sh/include/asm/processor_32.h

@@ -16,12 +16,6 @@
 #include <asm/types.h>
 #include <asm/hw_breakpoint.h>
 
-/*
- * Default implementation of macro that returns current
- * instruction pointer ("program counter").
- */
-#define current_text_addr() ({ void *pc; __asm__("mova	1f, %0\n.align 2\n1:":"=z" (pc)); pc; })
-
 /* Core Processor Version Register */
 #define CCN_PVR		0xff000030
 #define CCN_CVR		0xff000040

arch/sh/include/asm/processor_64.h

@@ -19,21 +19,6 @@
 #include <asm/types.h>
 #include <cpu/registers.h>
 
-/*
- * Default implementation of macro that returns current
- * instruction pointer ("program counter").
- */
-#define current_text_addr() ({ \
-void *pc; \
-unsigned long long __dummy = 0; \
-__asm__("gettr	tr0, %1\n\t" \
-	"pta	4, tr0\n\t" \
-	"gettr	tr0, %0\n\t" \
-	"ptabs	%1, tr0\n\t"	\
-	:"=r" (pc), "=r" (__dummy) \
-	: "1" (__dummy)); \
-pc; })
-
 #endif
 
 /*

arch/sparc/include/asm/processor_32.h

@@ -7,12 +7,6 @@
 #ifndef __ASM_SPARC_PROCESSOR_H
 #define __ASM_SPARC_PROCESSOR_H
 
-/*
- * Sparc32 implementation of macro that returns current
- * instruction pointer ("program counter").
- */
-#define current_text_addr() ({ void *pc; __asm__("sethi %%hi(1f), %0; or %0, %%lo(1f), %0;\n1:" : "=r" (pc)); pc; })
-
 #include <asm/psr.h>
 #include <asm/ptrace.h>
 #include <asm/head.h>

arch/sparc/include/asm/processor_64.h

@@ -8,12 +8,6 @@
 #ifndef __ASM_SPARC64_PROCESSOR_H
 #define __ASM_SPARC64_PROCESSOR_H
 
-/*
- * Sparc64 implementation of macro that returns current
- * instruction pointer ("program counter").
- */
-#define current_text_addr() ({ void *pc; __asm__("rd %%pc, %0" : "=r" (pc)); pc; })
-
 #include <asm/asi.h>
 #include <asm/pstate.h>
 #include <asm/ptrace.h>

arch/unicore32/include/asm/processor.h

@@ -13,12 +13,6 @@
 #ifndef __UNICORE_PROCESSOR_H__
 #define __UNICORE_PROCESSOR_H__
 
-/*
- * Default implementation of macro that returns current
- * instruction pointer ("program counter").
- */
-#define current_text_addr() ({ __label__ _l; _l: &&_l; })
-
 #ifdef __KERNEL__
 
 #include <asm/ptrace.h>

arch/x86/include/asm/kexec.h

@@ -21,6 +21,7 @@
 #ifndef __ASSEMBLY__
 
 #include <linux/string.h>
+#include <linux/kernel.h>
 
 #include <asm/page.h>
 #include <asm/ptrace.h>
@@ -132,7 +133,7 @@ static inline void crash_setup_regs(struct pt_regs *newregs,
 		asm volatile("movl %%cs, %%eax;" :"=a"(newregs->cs));
 		asm volatile("pushfq; popq %0" :"=m"(newregs->flags));
 #endif
-		newregs->ip = (unsigned long)current_text_addr();
+		newregs->ip = _THIS_IP_;
 	}
 }
 

arch/x86/include/asm/processor.h

@@ -42,18 +42,6 @@ struct vm86;
 #define NET_IP_ALIGN	0
 
 #define HBP_NUM 4
-/*
- * Default implementation of macro that returns current
- * instruction pointer ("program counter").
- */
-static inline void *current_text_addr(void)
-{
-	void *pc;
-
-	asm volatile("mov $1f, %0; 1:":"=r" (pc));
-
-	return pc;
-}
 
 /*
  * These alignment constraints are for performance in the vSMP case,

arch/x86/um/asm/processor_32.h

@@ -47,14 +47,6 @@ static inline void arch_copy_thread(struct arch_thread *from,
         memcpy(&to->tls_array, &from->tls_array, sizeof(from->tls_array));
 }
 
-/*
- * Default implementation of macro that returns current
- * instruction pointer ("program counter"). Stolen
- * from asm-i386/processor.h
- */
-#define current_text_addr() \
-	({ void *pc; __asm__("movl $1f,%0\n1:":"=g" (pc)); pc; })
-
 #define current_sp() ({ void *sp; __asm__("movl %%esp, %0" : "=r" (sp) : ); sp; })
 #define current_bp() ({ unsigned long bp; __asm__("movl %%ebp, %0" : "=r" (bp) : ); bp; })
 

arch/x86/um/asm/processor_64.h

@@ -31,9 +31,6 @@ static inline void arch_copy_thread(struct arch_thread *from,
 	to->fs = from->fs;
 }
 
-#define current_text_addr() \
-	({ void *pc; __asm__("movq $1f,%0\n1:":"=g" (pc)); pc; })
-
 #define current_sp() ({ void *sp; __asm__("movq %%rsp, %0" : "=r" (sp) : ); sp; })
 #define current_bp() ({ unsigned long bp; __asm__("movq %%rbp, %0" : "=r" (bp) : ); bp; })
 

arch/xtensa/include/asm/processor.h

@@ -152,14 +152,6 @@ struct thread_struct {
 	int align[0] __attribute__ ((aligned(16)));
 };
 
-
-/*
- * Default implementation of macro that returns current
- * instruction pointer ("program counter").
- */
-#define current_text_addr()  ({ __label__ _l; _l: &&_l;})
-
-
 /* This decides where the kernel will search for a free chunk of vm
  * space during mmap's.
  */