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    Subject[patch V149 47/50] x86/mm/dump_pagetables: Add page table directory
    The upcoming support for dumping the kernel and the user space page tables
    of the current process would create more random files in the top level
    debugfs directory.

    Add a page table directory and move the existing file to it.

    Signed-off-by: Borislav Petkov <bp@suse.de>
    Signed-off-by: Ingo Molnar <mingo@kernel.org>
    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
    Cc: Andy Lutomirski <luto@kernel.org>
    Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Brian Gerst <brgerst@gmail.com>
    Cc: Dave Hansen <dave.hansen@linux.intel.com>
    Cc: David Laight <David.Laight@aculab.com>
    Cc: Denys Vlasenko <dvlasenk@redhat.com>
    Cc: Eduardo Valentin <eduval@amazon.com>
    Cc: Greg KH <gregkh@linuxfoundation.org>
    Cc: H. Peter Anvin <hpa@zytor.com>
    Cc: Josh Poimboeuf <jpoimboe@redhat.com>
    Cc: Juergen Gross <jgross@suse.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Will Deacon <will.deacon@arm.com>
    Cc: aliguori@amazon.com
    Cc: daniel.gruss@iaik.tugraz.at
    Cc: hughd@google.com
    Cc: keescook@google.com
    ---
    arch/x86/mm/debug_pagetables.c | 15 ++++++++++-----
    1 file changed, 10 insertions(+), 5 deletions(-)

    diff --git a/arch/x86/mm/debug_pagetables.c b/arch/x86/mm/debug_pagetables.c
    index bfcffdf6c577..d1449fb6dc7a 100644
    --- a/arch/x86/mm/debug_pagetables.c
    +++ b/arch/x86/mm/debug_pagetables.c
    @@ -22,21 +22,26 @@ static const struct file_operations ptdump_fops = {
    .release = single_release,
    };

    -static struct dentry *pe;
    +static struct dentry *dir, *pe;

    static int __init pt_dump_debug_init(void)
    {
    - pe = debugfs_create_file("kernel_page_tables", S_IRUSR, NULL, NULL,
    - &ptdump_fops);
    - if (!pe)
    + dir = debugfs_create_dir("page_tables", NULL);
    + if (!dir)
    return -ENOMEM;

    + pe = debugfs_create_file("kernel", 0400, dir, NULL, &ptdump_fops);
    + if (!pe)
    + goto err;
    return 0;
    +err:
    + debugfs_remove_recursive(dir);
    + return -ENOMEM;
    }

    static void __exit pt_dump_debug_exit(void)
    {
    - debugfs_remove_recursive(pe);
    + debugfs_remove_recursive(dir);
    }

    module_init(pt_dump_debug_init);
    --
    2.14.1


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