Merge branch 'uprobes/core' of git://git.kernel.org/pub/scm/linux/kernel/git/oleg/misc into perf/core

Pull uprobes tmpfs support patches from Oleg Nesterov.

Signed-off-by: Ingo Molnar <[e-mail]>

arch/x86/include/asm/uprobes.h

···
 		struct {
 			u8	fixups;
 			u8	ilen;
-		} 			def;
+		} 			defparam;
 	};
 };
 

arch/x86/kernel/uprobes.c

···
  * If arch_uprobe->insn doesn't use rip-relative addressing, return
  * immediately.  Otherwise, rewrite the instruction so that it accesses
  * its memory operand indirectly through a scratch register.  Set
- * def->fixups accordingly. (The contents of the scratch register
+ * defparam->fixups accordingly. (The contents of the scratch register
  * will be saved before we single-step the modified instruction,
  * and restored afterward).
  *
···
 	 */
 	if (reg != 6 && reg2 != 6) {
 		reg2 = 6;
-		auprobe->def.fixups |= UPROBE_FIX_RIP_SI;
+		auprobe->defparam.fixups |= UPROBE_FIX_RIP_SI;
 	} else if (reg != 7 && reg2 != 7) {
 		reg2 = 7;
-		auprobe->def.fixups |= UPROBE_FIX_RIP_DI;
+		auprobe->defparam.fixups |= UPROBE_FIX_RIP_DI;
 		/* TODO (paranoia): force maskmovq to not use di */
 	} else {
 		reg2 = 3;
-		auprobe->def.fixups |= UPROBE_FIX_RIP_BX;
+		auprobe->defparam.fixups |= UPROBE_FIX_RIP_BX;
 	}
 	/*
 	 * Point cursor at the modrm byte.  The next 4 bytes are the
···
 static inline unsigned long *
 scratch_reg(struct arch_uprobe *auprobe, struct pt_regs *regs)
 {
-	if (auprobe->def.fixups & UPROBE_FIX_RIP_SI)
+	if (auprobe->defparam.fixups & UPROBE_FIX_RIP_SI)
 		return &regs->si;
-	if (auprobe->def.fixups & UPROBE_FIX_RIP_DI)
+	if (auprobe->defparam.fixups & UPROBE_FIX_RIP_DI)
 		return &regs->di;
 	return &regs->bx;
 }
···
  */
 static void riprel_pre_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
 {
-	if (auprobe->def.fixups & UPROBE_FIX_RIP_MASK) {
+	if (auprobe->defparam.fixups & UPROBE_FIX_RIP_MASK) {
 		struct uprobe_task *utask = current->utask;
 		unsigned long *sr = scratch_reg(auprobe, regs);
 
 		utask->autask.saved_scratch_register = *sr;
-		*sr = utask->vaddr + auprobe->def.ilen;
+		*sr = utask->vaddr + auprobe->defparam.ilen;
 	}
 }
 
 static void riprel_post_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
 {
-	if (auprobe->def.fixups & UPROBE_FIX_RIP_MASK) {
+	if (auprobe->defparam.fixups & UPROBE_FIX_RIP_MASK) {
 		struct uprobe_task *utask = current->utask;
 		unsigned long *sr = scratch_reg(auprobe, regs);
 
···
 	struct uprobe_task *utask = current->utask;
 
 	riprel_post_xol(auprobe, regs);
-	if (auprobe->def.fixups & UPROBE_FIX_IP) {
+	if (auprobe->defparam.fixups & UPROBE_FIX_IP) {
 		long correction = utask->vaddr - utask->xol_vaddr;
 		regs->ip += correction;
-	} else if (auprobe->def.fixups & UPROBE_FIX_CALL) {
-		regs->sp += sizeof_long();
-		if (push_ret_address(regs, utask->vaddr + auprobe->def.ilen))
+	} else if (auprobe->defparam.fixups & UPROBE_FIX_CALL) {
+		regs->sp += sizeof_long(); /* Pop incorrect return address */
+		if (push_ret_address(regs, utask->vaddr + auprobe->defparam.ilen))
 			return -ERESTART;
 	}
 	/* popf; tell the caller to not touch TF */
-	if (auprobe->def.fixups & UPROBE_FIX_SETF)
+	if (auprobe->defparam.fixups & UPROBE_FIX_SETF)
 		utask->autask.saved_tf = true;
 
 	return 0;
···
 
 	/*
 	 * Figure out which fixups default_post_xol_op() will need to perform,
-	 * and annotate def->fixups accordingly. To start with, ->fixups is
-	 * either zero or it reflects rip-related fixups.
+	 * and annotate defparam->fixups accordingly.
 	 */
 	switch (OPCODE1(&insn)) {
 	case 0x9d:		/* popf */
-		auprobe->def.fixups |= UPROBE_FIX_SETF;
+		auprobe->defparam.fixups |= UPROBE_FIX_SETF;
 		break;
 	case 0xc3:		/* ret or lret -- ip is correct */
 	case 0xcb:
···
 		riprel_analyze(auprobe, &insn);
 	}
 
-	auprobe->def.ilen = insn.length;
-	auprobe->def.fixups |= fix_ip_or_call;
+	auprobe->defparam.ilen = insn.length;
+	auprobe->defparam.fixups |= fix_ip_or_call;
 
 	auprobe->ops = &default_xol_ops;
 	return 0;