Re: [PATCH v5 1/9] MIPS: Avoid future duplicate elf core header reservation

[Geert Uytterhoeven]

Hi Mike,

On Mon, Aug 16, 2021 at 7:52 AM Mike Rapoport <rppt@xxxxxxxxxx> wrote:
> On Wed, Aug 11, 2021 at 10:50:59AM +0200, Geert Uytterhoeven wrote:
> > Prepare for early_init_fdt_scan_reserved_mem() reserving the memory
> > occupied by an elf core header described in the device tree.
> > As arch_mem_init() calls early_init_fdt_scan_reserved_mem() before
> > mips_reserve_vmcore(), the latter needs to check if the memory has
> > already been reserved before.
>
> Doing memblock_reserve() for the same region is usually fine, did you
> encounter any issues without this patch?

Does it also work if the same region is part of an earlier larger
reservation?  I am no memblock expert, so I don't know.
I didn't run into any issues, as my MIPS platform is non-DT, but I
assume arch/arm64/mm/init.c:reserve_elfcorehdr() had the check for
a reason.

Thanks!

>
> > Note that mips_reserve_vmcore() cannot just be removed, as not all MIPS
> > systems use DT.
> >
> > Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
> > ---
> > v5:
> >   - New.
> > ---
> >  arch/mips/kernel/setup.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
> > index 23a140327a0bac1b..4693add05743d78b 100644
> > --- a/arch/mips/kernel/setup.c
> > +++ b/arch/mips/kernel/setup.c
> > @@ -429,7 +429,8 @@ static void __init mips_reserve_vmcore(void)
> >       pr_info("Reserving %ldKB of memory at %ldKB for kdump\n",
> >               (unsigned long)elfcorehdr_size >> 10, (unsigned long)elfcorehdr_addr >> 10);
> >
> > -     memblock_reserve(elfcorehdr_addr, elfcorehdr_size);
> > +     if (!memblock_is_region_reserved(elfcorehdr_addr, elfcorehdr_size)
> > +             memblock_reserve(elfcorehdr_addr, elfcorehdr_size);
> >  #endif
> >  }

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds