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SubjectRe: [PATCH v2] x86/mm/64: Rename the register_page_bootmem_memmap() 'size' parameter to 'nr_pages'
On 10/26/17 at 08:25am, Ingo Molnar wrote:
>
> * Baoquan He <bhe@redhat.com> wrote:
>
> > 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.
> >
> > And also rename the existing local variable 'nr_pages' to 'pages'.
> > Otherwise building error will be reported since these two variables
> > are different type though both represent number of pages. Take
> > 'nr_pages' as register_page_bootmem_memmap()'s parameter name since
> > it has more specific meaning, can make better function interface.
> >
> > Signed-off-by: Baoquan He <bhe@redhat.com>
> > Cc: Linus Torvalds <torvalds@linux-foundation.org>
> > Cc: Peter Zijlstra <peterz@infradead.org>
> > Cc: Thomas Gleixner <tglx@linutronix.de>
> > Cc: akpm@linux-foundation.org
> > Link: http://lkml.kernel.org/r/1508849249-18035-1-git-send-email-bhe@redhat.com
> > Signed-off-by: Ingo Molnar <mingo@kernel.org>
> > ---
> > v1->v2:
> > Code change in v1 is incomplete, caused build failure. Change
> > it after Ingo pointed it out.
> >
> > And Ingo helped rewrite the change log of v1. I also add description
> > about the local variable change.
> >
> > arch/x86/mm/init_64.c | 10 +++++-----
> > include/linux/mm.h | 2 +-
> > 2 files changed, 6 insertions(+), 6 deletions(-)
> >
> > diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
> > index 048fbe8fc274..18b9d2c7f5ef 100644
> > --- a/arch/x86/mm/init_64.c
> > +++ b/arch/x86/mm/init_64.c
> > @@ -1426,16 +1426,16 @@ 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;
> > pud_t *pud;
> > pmd_t *pmd;
> > - unsigned int nr_pages;
> > + unsigned int pages;
> > struct page *page;
> >
> > for (; addr < end; addr = next) {
> > @@ -1482,9 +1482,9 @@ void register_page_bootmem_memmap(unsigned long section_nr,
> > if (pmd_none(*pmd))
> > continue;
> >
> > - nr_pages = 1 << (get_order(PMD_SIZE));
> > + pages = 1 << (get_order(PMD_SIZE));
>
> Why is the get_order() call in extra parentheses?

Yeah, the extra parentheses makes no sense, will clean it up.

>
> Also, the 'pages' name sucks in a similar way 'size' sucks - in this context where
> we _already_ have a nr_pages variable it should be something more expressive like
> 'nr_pmd_pages' or so.

nr_pmd_pages looks better, will use it instead.

Thanks for reviewing and great suggestion!

Thanks
Baoquan

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