Hello.
On úterý 31. srpna 2021 13:08:42 CEST Miaohe Lin wrote:
> On 2021/8/31 16:54, Oleksandr Natalenko wrote:
> > Hello.
> >
> > On pondělí 30. srpna 2021 16:10:47 CEST Miaohe Lin wrote:
> >> Use helper macro K() to convert the pages to the corresponding size.
> >> Minor readability improvement.
> >>
> >> Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
> >> ---
> >>
> >> mm/page_alloc.c | 12 +++++-------
> >> 1 file changed, 5 insertions(+), 7 deletions(-)
> >>
> >> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> >> index dbb3338d9287..d3983244f56f 100644
> >> --- a/mm/page_alloc.c
> >> +++ b/mm/page_alloc.c
> >> @@ -8134,8 +8134,7 @@ unsigned long free_reserved_area(void *start, void
> >> *end, int poison, const char }
> >>
> >> if (pages && s)
> >>
> >> - pr_info("Freeing %s memory: %ldK\n",
> >> - s, pages << (PAGE_SHIFT - 10));
> >> + pr_info("Freeing %s memory: %ldK\n", s, K(pages));
> >>
> >> return pages;
> >>
> >> }
> >>
> >> @@ -8180,14 +8179,13 @@ void __init mem_init_print_info(void)
> >>
> >> ", %luK highmem"
> >>
> >> #endif
> >>
> >> ")\n",
> >>
> >> - nr_free_pages() << (PAGE_SHIFT - 10),
> >> - physpages << (PAGE_SHIFT - 10),
> >> + K(nr_free_pages()), K(physpages),
> >>
> >> codesize >> 10, datasize >> 10, rosize >> 10,
> >> (init_data_size + init_code_size) >> 10, bss_size >> 10,
> >>
> >> - (physpages - totalram_pages() - totalcma_pages) << (PAGE_SHIFT
> >
> > - 10),
> >
> >> - totalcma_pages << (PAGE_SHIFT - 10)
> >> + K(physpages - totalram_pages() - totalcma_pages),
> >> + K(totalcma_pages)
> >>
> >> #ifdef CONFIG_HIGHMEM
> >>
> >> - , totalhigh_pages() << (PAGE_SHIFT - 10)
> >> + , K(totalhigh_pages())
> >>
> >> #endif
> >>
> >> );
> >>
> >> }
> >
> > (my concern is not quite within the scope of this submission, but I'll ask
> > anyway)
> >
> > Given we have this:
> >
> > ```
> > git grep '#define K(x)' v5.14
> > v5.14:drivers/base/node.c:#define K(x) ((x) << (PAGE_SHIFT - 10))
> > v5.14:drivers/net/hamradio/scc.c:#define K(x) kiss->x
> > v5.14:kernel/debug/kdb/kdb_main.c:#define K(x) ((x) << (PAGE_SHIFT - 10))
> > v5.14:mm/backing-dev.c:#define K(x) ((x) << (PAGE_SHIFT - 10))
> > v5.14:mm/memcontrol.c:#define K(x) ((x) << (PAGE_SHIFT-10))
> > v5.14:mm/oom_kill.c:#define K(x) ((x) << (PAGE_SHIFT-10))
> > v5.14:mm/page_alloc.c:#define K(x) ((x) << (PAGE_SHIFT-10))
> > ```
> >
> > Shouldn't this macro go to some header file instead to get rid of define
> > repetitions?
>
> Many thanks for figuring this out. I think we should get rid of these
> repetitions too. But I'am not sure where this definition should be. Any
> suggestion? Thanks.
I'm not sure what place suits best. At first I thought maybe linux/mm.h or
linux/mm_inline.h, but since PAGE_SHIFT is declared in asm-generic/page.h,
probably K(x) can also go there as well?
--
Oleksandr Natalenko (post-factum)
