linux-kernel - Re: [PATCH] x86/mm/64: Rename the argument 'size' as 'nr_pages' in register_page_bootmem

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Message-ID: <20171024132900.nxftpzwbuifon7tk@gmail.com>
Date:   Tue, 24 Oct 2017 15:29:00 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Baoquan He <bhe@...hat.com>
Cc:     linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
        x86@...nel.org
Subject: Re: [PATCH] x86/mm/64: Rename the argument 'size' as 'nr_pages' in
 register_page_bootmem_memmap


* Baoquan He <bhe@...hat.com> wrote:

> For register_page_bootmem_memmap(), the 3rd argument 'size' indicates
> the number of pages which are inside the memory section, not a size.
> 
> Signed-off-by: Baoquan He <bhe@...hat.com>
> ---
>  arch/x86/mm/init_64.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
> index 048fbe8fc274..f5aa0d7c4cd1 100644
> --- a/arch/x86/mm/init_64.c
> +++ b/arch/x86/mm/init_64.c
> @@ -1426,10 +1426,10 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)
>  
>  #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HAVE_BOOTMEM_INFO_NODE)
>  void register_page_bootmem_memmap(unsigned long section_nr,
> -				  struct page *start_page, unsigned long size)
> +				  struct page *start_page, unsigned long nr_pages)
>  {
>  	unsigned long addr = (unsigned long)start_page;
> -	unsigned long end = (unsigned long)(start_page + size);
> +	unsigned long end = (unsigned long)(start_page + nr_pages);
>  	unsigned long next;
>  	pgd_t *pgd;
>  	p4d_t *p4d;

This doesn't build on x86-64 allyesconfig:

arch/x86/mm/init_64.c: In function ‘register_page_bootmem_memmap’:
arch/x86/mm/init_64.c:1438:15: error: ‘nr_pages’ redeclared as different kind of symbol
arch/x86/mm/init_64.c:1429:46: note: previous definition of ‘nr_pages’ was here

Also note that I improved the changelog (see below), could you please pick those 
changes up for a v2 submission?

Thanks,

	Ingo

==================>
>From 67780ebe5c99190d2a946de106bd0c7b83e11b68 Mon Sep 17 00:00:00 2001
From: Baoquan He <bhe@...hat.com>
Date: Tue, 24 Oct 2017 20:47:29 +0800
Subject: [PATCH] x86/mm/64: Rename the register_page_bootmem_memmap() 'size' parameter to 'nr_pages'

register_page_bootmem_memmap()'s 3rd 'size' parameter is named
in a somewhat misleading fashion - rename it to 'nr_pages' which
makes the units of it much clearer.

Signed-off-by: Baoquan He <bhe@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: akpm@...ux-foundation.org
Link: http://lkml.kernel.org/r/1508849249-18035-1-git-send-email-bhe@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/mm/init_64.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 048fbe8fc274..f5aa0d7c4cd1 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -1426,10 +1426,10 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)
 
 #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HAVE_BOOTMEM_INFO_NODE)
 void register_page_bootmem_memmap(unsigned long section_nr,
-				  struct page *start_page, unsigned long size)
+				  struct page *start_page, unsigned long nr_pages)
 {
 	unsigned long addr = (unsigned long)start_page;
-	unsigned long end = (unsigned long)(start_page + size);
+	unsigned long end = (unsigned long)(start_page + nr_pages);
 	unsigned long next;
 	pgd_t *pgd;
 	p4d_t *p4d;