jprobes: remove JPROBE_ENTRY()

AFAICT now that jprobe.entry is a void *, JPROBE_ENTRY doesn't do anything
useful - so remove it ..

I've left a do-nothing version so that out-of-tree jprobes code will still
compile without modifications.

Signed-off-by: Michael Ellerman <[e-mail]>
Cc: Prasanna S Panchamukhi <[e-mail]>
Acked-by: Ananth N Mavinakayanahalli <[e-mail]>
Cc: Anil S Keshavamurthy <[e-mail]>
Cc: David S. Miller <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

Documentation/kprobes.txt

···
 fastcall, or anything else that affects how args are passed, the
 handler's declaration must match.
 
-NOTE: A macro JPROBE_ENTRY is provided to handle architecture-specific
-aliasing of jp->entry. In the interest of portability, it is advised
-to use:
-
-	jp->entry = JPROBE_ENTRY(handler);
-
 register_jprobe() returns 0 on success, or a negative errno otherwise.
 
 4.3 register_kretprobe
···
 }
 
 static struct jprobe my_jprobe = {
-	.entry = JPROBE_ENTRY(jdo_fork)
+	.entry = jdo_fork
 };
 
 static int __init jprobe_init(void)

include/asm-i386/kprobes.h

···
 	? (MAX_STACK_SIZE) \
 	: (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR)))
 
-#define JPROBE_ENTRY(pentry)	(kprobe_opcode_t *)pentry
 #define ARCH_SUPPORTS_KRETPROBES
 #define  ARCH_INACTIVE_KPROBE_COUNT 0
 #define flush_insn_slot(p)	do { } while (0)

include/asm-ia64/kprobes.h

···
 	struct prev_kprobe prev_kprobe[ARCH_PREV_KPROBE_SZ];
 };
 
-#define JPROBE_ENTRY(pentry)	(kprobe_opcode_t *)pentry
-
 #define ARCH_SUPPORTS_KRETPROBES
 #define  ARCH_INACTIVE_KPROBE_COUNT 1
 

include/asm-powerpc/kprobes.h

···
 	}								\
 }
 
-#define JPROBE_ENTRY(pentry)	(kprobe_opcode_t *)((func_descr_t *)pentry)
 #define is_trap(instr)	(IS_TW(instr) || IS_TD(instr) || \
 			IS_TWI(instr) || IS_TDI(instr))
 #else
 /* Use stock kprobe_lookup_name since ppc32 doesn't use function descriptors */
-#define JPROBE_ENTRY(pentry)	(kprobe_opcode_t *)(pentry)
 #define is_trap(instr)	(IS_TW(instr) || IS_TWI(instr))
 #endif
 

include/asm-s390/kprobes.h

···
 	? (MAX_STACK_SIZE) \
 	: (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR)))
 
-#define JPROBE_ENTRY(pentry) (kprobe_opcode_t *)(pentry)
-
 #define ARCH_SUPPORTS_KRETPROBES
 #define ARCH_INACTIVE_KPROBE_COUNT 0
 

include/asm-sparc64/kprobes.h

···
 #define BREAKPOINT_INSTRUCTION_2 0x91d02071 /* ta 0x71 */
 #define MAX_INSN_SIZE 2
 
-#define JPROBE_ENTRY(pentry)	(kprobe_opcode_t *)pentry
 #define arch_remove_kprobe(p)	do {} while (0)
 #define  ARCH_INACTIVE_KPROBE_COUNT 0
 

include/asm-x86_64/kprobes.h

···
 	? (MAX_STACK_SIZE) \
 	: (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR)))
 
-#define JPROBE_ENTRY(pentry)	(kprobe_opcode_t *)pentry
 #define ARCH_SUPPORTS_KRETPROBES
 #define  ARCH_INACTIVE_KPROBE_COUNT 1
 

include/linux/kprobes.h

···
 	void *entry;	/* probe handling code to jump to */
 };
 
+/* For backward compatibility with old code using JPROBE_ENTRY() */
+#define JPROBE_ENTRY(handler)	(handler)
+
 DECLARE_PER_CPU(struct kprobe *, current_kprobe);
 DECLARE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
 

net/dccp/probe.c

···
 	.kp	= {
 		.symbol_name = "dccp_sendmsg",
 	},
-	.entry	= JPROBE_ENTRY(jdccp_sendmsg),
+	.entry	= jdccp_sendmsg,
 };
 
 static int dccpprobe_open(struct inode *inode, struct file *file)

net/ipv4/tcp_probe.c

···
 	.kp = {
 		.symbol_name	= "tcp_rcv_established",
 	},
-	.entry	= JPROBE_ENTRY(jtcp_rcv_established),
+	.entry	= jtcp_rcv_established,
 };
 
 static int tcpprobe_open(struct inode * inode, struct file * file)