kprobes: Use this_cpu_ops
Use this_cpu ops in various places to optimize per cpu data access. Cc: Jason Baron <jbaron@redhat.com> Cc: Namhyung Kim <namhyung@gmail.com> Acked-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Tejun Heo <tj@kernel.org>
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3 changed files with 13 additions and 13 deletions
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@ -403,7 +403,7 @@ static void __kprobes save_previous_kprobe(struct kprobe_ctlblk *kcb)
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static void __kprobes restore_previous_kprobe(struct kprobe_ctlblk *kcb)
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{
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__get_cpu_var(current_kprobe) = kcb->prev_kprobe.kp;
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__this_cpu_write(current_kprobe, kcb->prev_kprobe.kp);
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kcb->kprobe_status = kcb->prev_kprobe.status;
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kcb->kprobe_old_flags = kcb->prev_kprobe.old_flags;
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kcb->kprobe_saved_flags = kcb->prev_kprobe.saved_flags;
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@ -412,7 +412,7 @@ static void __kprobes restore_previous_kprobe(struct kprobe_ctlblk *kcb)
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static void __kprobes set_current_kprobe(struct kprobe *p, struct pt_regs *regs,
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struct kprobe_ctlblk *kcb)
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{
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__get_cpu_var(current_kprobe) = p;
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__this_cpu_write(current_kprobe, p);
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kcb->kprobe_saved_flags = kcb->kprobe_old_flags
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= (regs->flags & (X86_EFLAGS_TF | X86_EFLAGS_IF));
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if (is_IF_modifier(p->ainsn.insn))
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@ -586,7 +586,7 @@ static int __kprobes kprobe_handler(struct pt_regs *regs)
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preempt_enable_no_resched();
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return 1;
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} else if (kprobe_running()) {
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p = __get_cpu_var(current_kprobe);
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p = __this_cpu_read(current_kprobe);
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if (p->break_handler && p->break_handler(p, regs)) {
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setup_singlestep(p, regs, kcb, 0);
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return 1;
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@ -759,11 +759,11 @@ static __used __kprobes void *trampoline_handler(struct pt_regs *regs)
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orig_ret_address = (unsigned long)ri->ret_addr;
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if (ri->rp && ri->rp->handler) {
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__get_cpu_var(current_kprobe) = &ri->rp->kp;
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__this_cpu_write(current_kprobe, &ri->rp->kp);
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get_kprobe_ctlblk()->kprobe_status = KPROBE_HIT_ACTIVE;
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ri->ret_addr = correct_ret_addr;
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ri->rp->handler(ri, regs);
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__get_cpu_var(current_kprobe) = NULL;
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__this_cpu_write(current_kprobe, NULL);
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}
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recycle_rp_inst(ri, &empty_rp);
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@ -1198,10 +1198,10 @@ static void __kprobes optimized_callback(struct optimized_kprobe *op,
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regs->ip = (unsigned long)op->kp.addr + INT3_SIZE;
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regs->orig_ax = ~0UL;
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__get_cpu_var(current_kprobe) = &op->kp;
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__this_cpu_write(current_kprobe, &op->kp);
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kcb->kprobe_status = KPROBE_HIT_ACTIVE;
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opt_pre_handler(&op->kp, regs);
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__get_cpu_var(current_kprobe) = NULL;
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__this_cpu_write(current_kprobe, NULL);
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}
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preempt_enable_no_resched();
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}
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@ -303,12 +303,12 @@ struct hlist_head * kretprobe_inst_table_head(struct task_struct *tsk);
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/* kprobe_running() will just return the current_kprobe on this CPU */
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static inline struct kprobe *kprobe_running(void)
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{
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return (__get_cpu_var(current_kprobe));
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return (__this_cpu_read(current_kprobe));
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}
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static inline void reset_current_kprobe(void)
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{
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__get_cpu_var(current_kprobe) = NULL;
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__this_cpu_write(current_kprobe, NULL);
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}
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static inline struct kprobe_ctlblk *get_kprobe_ctlblk(void)
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@ -317,12 +317,12 @@ void __kprobes free_optinsn_slot(kprobe_opcode_t * slot, int dirty)
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/* We have preemption disabled.. so it is safe to use __ versions */
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static inline void set_kprobe_instance(struct kprobe *kp)
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{
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__get_cpu_var(kprobe_instance) = kp;
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__this_cpu_write(kprobe_instance, kp);
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}
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static inline void reset_kprobe_instance(void)
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{
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__get_cpu_var(kprobe_instance) = NULL;
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__this_cpu_write(kprobe_instance, NULL);
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}
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/*
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@ -775,7 +775,7 @@ static void __kprobes aggr_post_handler(struct kprobe *p, struct pt_regs *regs,
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static int __kprobes aggr_fault_handler(struct kprobe *p, struct pt_regs *regs,
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int trapnr)
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{
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struct kprobe *cur = __get_cpu_var(kprobe_instance);
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struct kprobe *cur = __this_cpu_read(kprobe_instance);
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/*
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* if we faulted "during" the execution of a user specified
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@ -790,7 +790,7 @@ static int __kprobes aggr_fault_handler(struct kprobe *p, struct pt_regs *regs,
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static int __kprobes aggr_break_handler(struct kprobe *p, struct pt_regs *regs)
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{
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struct kprobe *cur = __get_cpu_var(kprobe_instance);
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struct kprobe *cur = __this_cpu_read(kprobe_instance);
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int ret = 0;
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if (cur && cur->break_handler) {
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