linux-kernel - Re: [PATCH 1/3] mm, vc_screen: move __free() handler that frees a page to a common header

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Message-ID: <e0d09eb8-a53f-4dce-a858-8852cf8695d2@kernel.org>
Date: Sat, 18 Oct 2025 19:59:38 +0200
From: Jiri Slaby <jirislaby@...nel.org>
To: Mike Rapoport <rppt@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>
Cc: Brendan Jackman <jackmanb@...gle.com>,
 David Hildenbrand <david@...hat.com>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Johannes Weiner <hannes@...xchg.org>, Julia Lawall <Julia.Lawall@...ia.fr>,
 "Liam R. Howlett" <Liam.Howlett@...cle.com>,
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, Michal Hocko
 <mhocko@...e.com>, Suren Baghdasaryan <surenb@...gle.com>,
 Vlastimil Babka <vbabka@...e.cz>, Zi Yan <ziy@...dia.com>,
 linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 1/3] mm, vc_screen: move __free() handler that frees a
 page to a common header

On 18. 10. 25, 11:30, Mike Rapoport wrote:
> From: "Mike Rapoport (Microsoft)" <rppt@...nel.org>
> 
> vc_screen defines __free() handler that frees a page using free_page().
> Move that definition to include/linux/gfp.h next to free_page() and
> rename it from free_page_ptr to free_page.
> 
> Signed-off-by: Mike Rapoport (Microsoft) <rppt@...nel.org>
> ---
>   drivers/tty/vt/vc_screen.c | 6 ++----
>   include/linux/gfp.h        | 2 ++
>   2 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/tty/vt/vc_screen.c b/drivers/tty/vt/vc_screen.c
> index c814644ef4ee..d2029f029de6 100644
> --- a/drivers/tty/vt/vc_screen.c
> +++ b/drivers/tty/vt/vc_screen.c
> @@ -53,8 +53,6 @@
>   #define HEADER_SIZE	4u
>   #define CON_BUF_SIZE (IS_ENABLED(CONFIG_BASE_SMALL) ? 256 : PAGE_SIZE)
>   
> -DEFINE_FREE(free_page_ptr, void *, if (_T) free_page((unsigned long)_T));
> -
>   /*
>    * Our minor space:
>    *
> @@ -371,7 +369,7 @@ vcs_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
>   	loff_t pos;
>   	bool viewed, attr, uni_mode;
>   
> -	char *con_buf __free(free_page_ptr) = (char *)__get_free_page(GFP_KERNEL);
> +	char *con_buf __free(free_page) = (char *)__get_free_page(GFP_KERNEL);
>   	if (!con_buf)
>   		return -ENOMEM;
>   
> @@ -596,7 +594,7 @@ vcs_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
>   	if (use_unicode(inode))
>   		return -EOPNOTSUPP;
>   
> -	char *con_buf __free(free_page_ptr) = (char *)__get_free_page(GFP_KERNEL);
> +	char *con_buf __free(free_page) = (char *)__get_free_page(GFP_KERNEL);
>   	if (!con_buf)
>   		return -ENOMEM;
>   
> diff --git a/include/linux/gfp.h b/include/linux/gfp.h
> index f46b066c7661..ee3f27046667 100644
> --- a/include/linux/gfp.h
> +++ b/include/linux/gfp.h
> @@ -385,6 +385,8 @@ extern void free_pages(unsigned long addr, unsigned int order);
>   #define __free_page(page) __free_pages((page), 0)
>   #define free_page(addr) free_pages((addr), 0)
>   
> +DEFINE_FREE(free_page, unsigned long, if (!IS_ERR_OR_NULL(_T)) free_page(_T));

This IMO breaks the build at this point, right? Makes sense after 3/3, 
though.

-- 
js
suse labs