Hi all,
On Thu, 18 Feb 2021 07:52:52 -0600 Rob Herring <robherring2@xxxxxxxxx> wrote:
>
> On Thu, Feb 18, 2021 at 5:34 AM Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> wrote:
> >
> > On Thu, 18 Feb 2021 21:44:37 +1100 Michael Ellerman <mpe@xxxxxxxxxxxxxx> wrote:
> > >
> > > I think it just needs this?
> > >
> > > diff --git a/arch/powerpc/kexec/elf_64.c b/arch/powerpc/kexec/elf_64.c
> > > index 87e34611f93d..0492ca6003f3 100644
> > > --- a/arch/powerpc/kexec/elf_64.c
> > > +++ b/arch/powerpc/kexec/elf_64.c
> > > @@ -104,7 +104,7 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
> > >
> > > fdt = of_kexec_alloc_and_setup_fdt(image, initrd_load_addr,
> > > initrd_len, cmdline,
> > > - fdt_totalsize(initial_boot_params));
> > > + kexec_fdt_totalsize_ppc64(image));
> > > if (!fdt) {
> > > pr_err("Error setting up the new device tree.\n");
> > > ret = -EINVAL;
> > >
> >
> > I thought about that, but the last argument to
> > of_kexec_alloc_and_setup_fdt() is extra_fdt_size and the allocation
> > done is for this:
> >
> > fdt_size = fdt_totalsize(initial_boot_params) +
> > (cmdline ? strlen(cmdline) : 0) +
> > FDT_EXTRA_SPACE +
> > extra_fdt_size;
> >
> > and kexec_fdt_totalsize_ppc64() also includes
> > fdt_totalsize(initial_boot_params) so I was not sure. Maybe
> > kexec_fdt_totalsize_ppc64() needs modification as well?
>
> You're both right. Michael's fix is sufficient for the merge. The only
> risk with a larger size is failing to allocate it, but we're talking
> only 10s of KB. Historically until the commit causing the conflict,
> PPC was just used 2x fdt_totalsize(initial_boot_params). You could
> drop 'fdt_size = fdt_totalsize(initial_boot_params) + (2 *
> COMMAND_LINE_SIZE);' from kexec_fdt_totalsize_ppc64() as well, but
> then the function name is misleading.
>
> Lakshmi can send a follow-up patch to fine tune the size and rename
> kexec_fdt_totalsize_ppc64.
OK, I have mode Michael's suggested change to my resolution from today.
--
Cheers,
Stephen Rothwell
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