percpu: make misc percpu symbols unique

This patch updates misc percpu related symbols such that percpu
symbols are unique and don't clash with local symbols. This serves
two purposes of decreasing the possibility of global percpu symbol
collision and allowing dropping per_cpu__ prefix from percpu symbols.

* drivers/crypto/padlock-aes.c: s/last_cword/paes_last_cword/

* drivers/lguest/x86/core.c: s/last_cpu/lg_last_cpu/

* drivers/s390/net/netiucv.c: rename the variable used in a macro to
avoid clashing with percpu symbol

* arch/mn10300/kernel/kprobes.c: replace current_ prefix with cur_ for
static variables. Please note that percpu symbol current_kprobe
can't be changed as it's used by generic code.

Partly based on Rusty Russell's "alloc_percpu: rename percpu vars
which cause name clashes" patch.

Signed-off-by: Tejun Heo <[e-mail]>
Reviewed-by: Christoph Lameter <[e-mail]>
Cc: Rusty Russell <[e-mail]>
Cc: Herbert Xu <[e-mail]>
Cc: Chuck Ebbert <[e-mail]>
Cc: David Howells <[e-mail]>
Cc: Koichi Yasutake <[e-mail]>
Cc: Ananth N Mavinakayanahalli <[e-mail]>
Cc: Anil S Keshavamurthy <[e-mail]>
Cc: David S. Miller <[e-mail]>
Cc: Masami Hiramatsu <[e-mail]>
Cc: Martin Schwidefsky <[e-mail]>
Cc: Heiko Carstens <[e-mail]>
Cc: [e-mail]

arch/mn10300/kernel/kprobes.c

···
 #define KPROBE_HIT_ACTIVE	0x00000001
 #define KPROBE_HIT_SS		0x00000002
 
-static struct kprobe *current_kprobe;
-static unsigned long current_kprobe_orig_pc;
-static unsigned long current_kprobe_next_pc;
-static int current_kprobe_ss_flags;
+static struct kprobe *cur_kprobe;
+static unsigned long cur_kprobe_orig_pc;
+static unsigned long cur_kprobe_next_pc;
+static int cur_kprobe_ss_flags;
 static unsigned long kprobe_status;
-static kprobe_opcode_t current_kprobe_ss_buf[MAX_INSN_SIZE + 2];
-static unsigned long current_kprobe_bp_addr;
+static kprobe_opcode_t cur_kprobe_ss_buf[MAX_INSN_SIZE + 2];
+static unsigned long cur_kprobe_bp_addr;
 
 DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL;
 
···
 {
 	unsigned long nextpc;
 
-	current_kprobe_orig_pc = regs->pc;
-	memcpy(current_kprobe_ss_buf, &p->ainsn.insn[0], MAX_INSN_SIZE);
-	regs->pc = (unsigned long) current_kprobe_ss_buf;
+	cur_kprobe_orig_pc = regs->pc;
+	memcpy(cur_kprobe_ss_buf, &p->ainsn.insn[0], MAX_INSN_SIZE);
+	regs->pc = (unsigned long) cur_kprobe_ss_buf;
 
-	nextpc = find_nextpc(regs, &current_kprobe_ss_flags);
-	if (current_kprobe_ss_flags & SINGLESTEP_PCREL)
-		current_kprobe_next_pc =
-			current_kprobe_orig_pc + (nextpc - regs->pc);
+	nextpc = find_nextpc(regs, &cur_kprobe_ss_flags);
+	if (cur_kprobe_ss_flags & SINGLESTEP_PCREL)
+		cur_kprobe_next_pc = cur_kprobe_orig_pc + (nextpc - regs->pc);
 	else
-		current_kprobe_next_pc = nextpc;
+		cur_kprobe_next_pc = nextpc;
 
 	/* branching instructions need special handling */
-	if (current_kprobe_ss_flags & SINGLESTEP_BRANCH)
+	if (cur_kprobe_ss_flags & SINGLESTEP_BRANCH)
 		nextpc = singlestep_branch_setup(regs);
 
-	current_kprobe_bp_addr = nextpc;
+	cur_kprobe_bp_addr = nextpc;
 
 	*(u8 *) nextpc = BREAKPOINT_INSTRUCTION;
-	mn10300_dcache_flush_range2((unsigned) current_kprobe_ss_buf,
-				    sizeof(current_kprobe_ss_buf));
+	mn10300_dcache_flush_range2((unsigned) cur_kprobe_ss_buf,
+				    sizeof(cur_kprobe_ss_buf));
 	mn10300_icache_inv();
 }
 
···
 			disarm_kprobe(p, regs);
 			ret = 1;
 		} else {
-			p = current_kprobe;
+			p = cur_kprobe;
 			if (p->break_handler && p->break_handler(p, regs))
 				goto ss_probe;
 		}
···
 	}
 
 	kprobe_status = KPROBE_HIT_ACTIVE;
-	current_kprobe = p;
+	cur_kprobe = p;
 	if (p->pre_handler(p, regs)) {
 		/* handler has already set things up, so skip ss setup */
 		return 1;
···
 static void __kprobes resume_execution(struct kprobe *p, struct pt_regs *regs)
 {
 	/* we may need to fixup regs/stack after singlestepping a call insn */
-	if (current_kprobe_ss_flags & SINGLESTEP_BRANCH) {
-		regs->pc = current_kprobe_orig_pc;
+	if (cur_kprobe_ss_flags & SINGLESTEP_BRANCH) {
+		regs->pc = cur_kprobe_orig_pc;
 		switch (p->ainsn.insn[0]) {
 		case 0xcd:	/* CALL (d16,PC) */
 			*(unsigned *) regs->sp = regs->mdr = regs->pc + 5;
···
 		}
 	}
 
-	regs->pc = current_kprobe_next_pc;
-	current_kprobe_bp_addr = 0;
+	regs->pc = cur_kprobe_next_pc;
+	cur_kprobe_bp_addr = 0;
 }
 
 static inline int __kprobes post_kprobe_handler(struct pt_regs *regs)
···
 	if (!kprobe_running())
 		return 0;
 
-	if (current_kprobe->post_handler)
-		current_kprobe->post_handler(current_kprobe, regs, 0);
+	if (cur_kprobe->post_handler)
+		cur_kprobe->post_handler(cur_kprobe, regs, 0);
 
-	resume_execution(current_kprobe, regs);
+	resume_execution(cur_kprobe, regs);
 	reset_current_kprobe();
 	preempt_enable_no_resched();
 	return 1;
···
 static inline
 int __kprobes kprobe_fault_handler(struct pt_regs *regs, int trapnr)
 {
-	if (current_kprobe->fault_handler &&
-	    current_kprobe->fault_handler(current_kprobe, regs, trapnr))
+	if (cur_kprobe->fault_handler &&
+	    cur_kprobe->fault_handler(cur_kprobe, regs, trapnr))
 		return 1;
 
 	if (kprobe_status & KPROBE_HIT_SS) {
-		resume_execution(current_kprobe, regs);
+		resume_execution(cur_kprobe, regs);
 		reset_current_kprobe();
 		preempt_enable_no_resched();
 	}
···
 
 	switch (val) {
 	case DIE_BREAKPOINT:
-		if (current_kprobe_bp_addr != args->regs->pc) {
+		if (cur_kprobe_bp_addr != args->regs->pc) {
 			if (kprobe_handler(args->regs))
 				return NOTIFY_STOP;
 		} else {

drivers/crypto/padlock-aes.c

···
 	u32 *D;
 };
 
-static DEFINE_PER_CPU(struct cword *, last_cword);
+static DEFINE_PER_CPU(struct cword *, paes_last_cword);
 
 /* Tells whether the ACE is capable to generate
    the extended key for a given key_len. */
···
 
 ok:
 	for_each_online_cpu(cpu)
-		if (&ctx->cword.encrypt == per_cpu(last_cword, cpu) ||
-		    &ctx->cword.decrypt == per_cpu(last_cword, cpu))
-			per_cpu(last_cword, cpu) = NULL;
+		if (&ctx->cword.encrypt == per_cpu(paes_last_cword, cpu) ||
+		    &ctx->cword.decrypt == per_cpu(paes_last_cword, cpu))
+			per_cpu(paes_last_cword, cpu) = NULL;
 
 	return 0;
 }
···
 {
 	int cpu = raw_smp_processor_id();
 
-	if (cword != per_cpu(last_cword, cpu))
+	if (cword != per_cpu(paes_last_cword, cpu))
 #ifndef CONFIG_X86_64
 		asm volatile ("pushfl; popfl");
 #else
···
 
 static inline void padlock_store_cword(struct cword *cword)
 {
-	per_cpu(last_cword, raw_smp_processor_id()) = cword;
+	per_cpu(paes_last_cword, raw_smp_processor_id()) = cword;
 }
 
 /*

drivers/lguest/x86/core.c

···
 		  (SWITCHER_ADDR + SHARED_SWITCHER_PAGES*PAGE_SIZE))[cpu]);
 }
 
-static DEFINE_PER_CPU(struct lg_cpu *, last_cpu);
+static DEFINE_PER_CPU(struct lg_cpu *, lg_last_cpu);
 
 /*S:010
  * We approach the Switcher.
···
 	 * meanwhile).  If that's not the case, we pretend everything in the
 	 * Guest has changed.
 	 */
-	if (__get_cpu_var(last_cpu) != cpu || cpu->last_pages != pages) {
-		__get_cpu_var(last_cpu) = cpu;
+	if (__get_cpu_var(lg_last_cpu) != cpu || cpu->last_pages != pages) {
+		__get_cpu_var(lg_last_cpu) = cpu;
 		cpu->last_pages = pages;
 		cpu->changed = CHANGED_ALL;
 	}

drivers/s390/net/netiucv.c

···
 #define IUCV_DBF_TEXT_(name, level, text...) \
 	do { \
 		if (iucv_dbf_passes(iucv_dbf_##name, level)) { \
-			char* iucv_dbf_txt_buf = \
-					get_cpu_var(iucv_dbf_txt_buf); \
-			sprintf(iucv_dbf_txt_buf, text); \
-			debug_text_event(iucv_dbf_##name, level, \
-						iucv_dbf_txt_buf); \
+			char* __buf = get_cpu_var(iucv_dbf_txt_buf); \
+			sprintf(__buf, text); \
+			debug_text_event(iucv_dbf_##name, level, __buf); \
 			put_cpu_var(iucv_dbf_txt_buf); \
 		} \
 	} while (0)