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Biederman" , kexec mailing list , LKML , Jonathan Corbet , Catalin Marinas , will@kernel.org, Linux ARM , Marc Zyngier , James Morse , Vladimir Murzin , Matthias Brugger , Bhupesh Sharma , linux-mm Content-Type: text/plain; charset="UTF-8" X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Hi Mark, Thank you for your review comments. My replies below: On Mon, Aug 19, 2019 at 11:50 AM Mark Rutland wrote: > > On Fri, Aug 16, 2019 at 10:46:17PM -0400, Pavel Tatashin wrote: > > create_safe_exec_page() is going to be split into two parts in preparation > > of moving page table handling code out of hibernate.c > > > > Remove allocator parameter, and rename dst to page. Also, remove the > > goto's, as we can return directly without cleanups. > > It would be nice if you could do the goto/allocator/rename changes as > separate patches, since it's vastly easier to verify each change in > isolation that way. Sure, I will split these changes into separate patches in the next version of this patch series. > > What's the point of the rename? It's inconsistent with the phys_dst_addr > that you leave as-is, so I'm not sure that's worthwhile. dst_addr, phys_dst_addr VA/PA destination addresses. But, page is a buffer in the current VA space (hence changed to void *), dst looked confusing as it seemed as it was part of the destination addresses. > > > > > Signed-off-by: Pavel Tatashin > > --- > > arch/arm64/kernel/hibernate.c | 60 +++++++++++++++-------------------- > > 1 file changed, 26 insertions(+), 34 deletions(-) > > > > diff --git a/arch/arm64/kernel/hibernate.c b/arch/arm64/kernel/hibernate.c > > index 9341fcc6e809..96b6f8da7e49 100644 > > --- a/arch/arm64/kernel/hibernate.c > > +++ b/arch/arm64/kernel/hibernate.c > > @@ -196,57 +196,51 @@ EXPORT_SYMBOL(arch_hibernation_header_restore); > > */ > > static int create_safe_exec_page(void *src_start, size_t length, > > unsigned long dst_addr, > > - phys_addr_t *phys_dst_addr, > > - void *(*allocator)(gfp_t mask), > > - gfp_t mask) > > + phys_addr_t *phys_dst_addr) > > { > > - int rc = 0; > > + void *page = (void *)get_safe_page(GFP_ATOMIC); > > + pgd_t *trans_table; > > The addition of this trans_table variable wasn't mentioned in the commit > message... > > > + trans_table = (void *)get_safe_page(GFP_ATOMIC); > > + if (!trans_table) > > + return -ENOMEM; > > > > - pgdp = pgd_offset_raw(allocator(mask), dst_addr); > > + pgdp = pgd_offset_raw(trans_table, dst_addr); > > > - write_sysreg(phys_to_ttbr(virt_to_phys(pgdp)), ttbr0_el1); > > + write_sysreg(phys_to_ttbr(virt_to_phys(trans_table)), ttbr0_el1); > > > ... and I guess you're trying to ensure that we program the TTBR with > the correct base address, without the offset of whatever pgd entry we > happen to have plumbed in? > > I think that's a fix, and should come before any other cleanup or > rework. Yes. > > If you can respin that specific change with s/trans_table/pgdir/, that > would make sense to me. I will split this patch into several changes. I will describe trans_table rational in different e-mail. There we will decide what namespace to use. Thank you, Pasha