[Deepin-Kernel-SIG] [Backport] [linux 6.6-y] Backport some commits by Uniontech in v6.14-rc3

[Avenger-285714]

Summary by Sourcery

Enhancements:

• Remove the proc_cpuinfo_notifier API and simplify the output of /proc/cpuinfo

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request removes the notifier chain related to proc_cpuinfo, modifies the output format of hardware watchpoint information, and adds a forward declaration for struct seq_file in asm/smp.h.

Updated class diagram for cpu-info.h

classDiagram
    class cpu-info.h {
        <<removed>>
        -register_proc_cpuinfo_notifier(struct notifier_block *nb)
        <<removed>>
        -proc_cpuinfo_notifier_call_chain(unsigned long val, void *v)
        <<removed>>
        -proc_cpuinfo_notifier(fn, pri)
        <<removed>>
        -proc_cpuinfo_notifier_args
    }

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File-Level Changes

Change	Details	Files
Removed the notifier chain for proc_cpuinfo.	Removed proc_cpuinfo_chain raw notifier head. Removed register_proc_cpuinfo_notifier function. Removed proc_cpuinfo_notifier_call_chain function. Removed proc_cpuinfo_notifier macro. Removed proc_cpuinfo_notifier_args structure. Removed the call to raw_notifier_call_chain within show_cpuinfo.	arch/loongarch/kernel/proc.c arch/loongarch/include/asm/cpu-info.h
Modified the output format of hardware watchpoint information in show_cpuinfo.	Replaced the explicit "yes"/"no" output with a call to str_yes_no. Consolidated the watchpoint counts into a single seq_printf call.	arch/loongarch/kernel/proc.c
Added forward declaration of struct seq_file in asm/smp.h.	Added struct seq_file; to arch/loongarch/include/asm/smp.h.	arch/loongarch/include/asm/smp.h

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[sourcery-ai]

Hey @Avenger-285714 - I've reviewed your changes - here's some feedback:

Overall Comments:

• Consider using seq_puts instead of seq_printf when printing constant strings to improve performance.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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