linux-kernel - Re: [RFC 2/2] kread: avoid duplicates

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Date:   Fri, 14 Apr 2023 08:35:53 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Luis Chamberlain <mcgrof@...nel.org>
Cc:     david@...hat.com, patches@...ts.linux.dev,
        linux-modules@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, pmladek@...e.com,
        petr.pavlu@...e.com, prarit@...hat.com,
        torvalds@...ux-foundation.org, rafael@...nel.org,
        christophe.leroy@...roup.eu, tglx@...utronix.de,
        peterz@...radead.org, song@...nel.org, rppt@...nel.org,
        dave@...olabs.net, willy@...radead.org, vbabka@...e.cz,
        mhocko@...e.com, dave.hansen@...ux.intel.com,
        colin.i.king@...il.com, jim.cromie@...il.com,
        catalin.marinas@....com, jbaron@...mai.com,
        rick.p.edgecombe@...el.com
Subject: Re: [RFC 2/2] kread: avoid duplicates

On Thu, Apr 13, 2023 at 10:28:40PM -0700, Luis Chamberlain wrote:
> With this we run into 0 wasted virtual memory bytes.

This changelog does not make any sense at all, sorry.  What are you
doing here and why?

> 
> Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
> ---
>  fs/kernel_read_file.c | 150 ++++++++++++++++++++++++++++++++++++++++++
>  kernel/module/main.c  |   6 +-
>  2 files changed, 154 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/kernel_read_file.c b/fs/kernel_read_file.c
> index 5d826274570c..209c56764442 100644
> --- a/fs/kernel_read_file.c
> +++ b/fs/kernel_read_file.c
> @@ -4,6 +4,7 @@
>  #include <linux/kernel_read_file.h>
>  #include <linux/security.h>
>  #include <linux/vmalloc.h>
> +#include <linux/fdtable.h>
>  
>  /**
>   * kernel_read_file() - read file contents into a kernel buffer
> @@ -171,17 +172,166 @@ ssize_t kernel_read_file_from_path_initns(const char *path, loff_t offset,
>  }
>  EXPORT_SYMBOL_GPL(kernel_read_file_from_path_initns);
>  
> +DEFINE_MUTEX(kread_dup_mutex);

static?

I stopped reading here :)

thanks,

greg k-h