LoongArch: Remove the deprecated notifier hook mechanism

The notifier hook mechanism in proc and cpuinfo is actually unnecessary
for LoongArch because it's not used anywhere.

It was originally added to the MIPS code in commit d6d3c9afaab4 ("MIPS:
MT: proc: Add support for printing VPE and TC ids"), and LoongArch then
inherited it.

But as the kernel code stands now, this notifier hook mechanism doesn't
really make sense for either LoongArch or MIPS.

In addition, the seq_file forward declaration needs to be moved to its
proper place, as only the show_ipi_list() function in smp.c requires it.

Co-developed-by: Wentao Guan <guanwentao@uniontech.com>
Signed-off-by: Wentao Guan <guanwentao@uniontech.com>
Signed-off-by: Yuli Wang <wangyuli@uniontech.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

diff --git a/arch/loongarch/include/asm/cpu-info.h b/arch/loongarch/include/asm/cpu-info.h
index 35e0a230a48495cb16a5c35deeb5f564e80c586e..7f5bc0ad9d505cb85119ae0ec2f89ffca0721191 100644 (file)
--- a/arch/loongarch/include/asm/cpu-info.h
+++ b/arch/loongarch/include/asm/cpu-info.h
@@ -76,27 +76,6 @@ extern const char *__cpu_full_name[];
 #define cpu_family_string()    __cpu_family[raw_smp_processor_id()]
 #define cpu_full_name_string() __cpu_full_name[raw_smp_processor_id()]
 
-struct seq_file;
-struct notifier_block;
-
-extern int register_proc_cpuinfo_notifier(struct notifier_block *nb);
-extern int proc_cpuinfo_notifier_call_chain(unsigned long val, void *v);
-
-#define proc_cpuinfo_notifier(fn, pri)                                 \
-({                                                                     \
-       static struct notifier_block fn##_nb = {                        \
-               .notifier_call = fn,                                    \
-               .priority = pri                                         \
-       };                                                              \
-                                                                       \
-       register_proc_cpuinfo_notifier(&fn##_nb);                       \
-})
-
-struct proc_cpuinfo_notifier_args {
-       struct seq_file *m;
-       unsigned long n;
-};
-
 static inline bool cpus_are_siblings(int cpua, int cpub)
 {
        struct cpuinfo_loongarch *infoa = &cpu_data[cpua];

diff --git a/arch/loongarch/include/asm/smp.h b/arch/loongarch/include/asm/smp.h
index 3383c9d24e94240f4ece78ee671457fd576a2e03..b87d1d5e5890528decfc8f06ebf1f9a1001570e0 100644 (file)
--- a/arch/loongarch/include/asm/smp.h
+++ b/arch/loongarch/include/asm/smp.h
@@ -77,6 +77,8 @@ extern int __cpu_logical_map[NR_CPUS];
 #define SMP_IRQ_WORK           BIT(ACTION_IRQ_WORK)
 #define SMP_CLEAR_VECTOR       BIT(ACTION_CLEAR_VECTOR)
 
+struct seq_file;
+
 struct secondary_data {
        unsigned long stack;
        unsigned long thread_info;

diff --git a/arch/loongarch/kernel/proc.c b/arch/loongarch/kernel/proc.c
index 56a230238c9cfdb6c449414e3075a5a3cb26a8e4..cea30768ae92a61098f8d815e8006ec09cf1ccb5 100644 (file)
--- a/arch/loongarch/kernel/proc.c
+++ b/arch/loongarch/kernel/proc.c
@@ -13,28 +13,12 @@
 #include <asm/processor.h>
 #include <asm/time.h>
 
-/*
- * No lock; only written during early bootup by CPU 0.
- */
-static RAW_NOTIFIER_HEAD(proc_cpuinfo_chain);
-
-int __ref register_proc_cpuinfo_notifier(struct notifier_block *nb)
-{
-       return raw_notifier_chain_register(&proc_cpuinfo_chain, nb);
-}
-
-int proc_cpuinfo_notifier_call_chain(unsigned long val, void *v)
-{
-       return raw_notifier_call_chain(&proc_cpuinfo_chain, val, v);
-}
-
 static int show_cpuinfo(struct seq_file *m, void *v)
 {
        unsigned long n = (unsigned long) v - 1;
        unsigned int isa = cpu_data[n].isa_level;
        unsigned int version = cpu_data[n].processor_id & 0xff;
        unsigned int fp_version = cpu_data[n].fpu_vers;
-       struct proc_cpuinfo_notifier_args proc_cpuinfo_notifier_args;
 
 #ifdef CONFIG_SMP
        if (!cpu_online(n))
@@ -97,12 +81,6 @@ static int show_cpuinfo(struct seq_file *m, void *v)
                      cpu_data[n].watch_ireg_count, cpu_data[n].watch_dreg_count);
        }
 
-       proc_cpuinfo_notifier_args.m = m;
-       proc_cpuinfo_notifier_args.n = n;
-
-       raw_notifier_call_chain(&proc_cpuinfo_chain, 0,
-                               &proc_cpuinfo_notifier_args);
-
        seq_printf(m, "\n\n");
 
        return 0;