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    SubjectRe: [PATCH v3 06/60] arm64: ptdump: Allow VMALLOC_END to be defined at boot
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    On 07/03/2023 14:04, Ard Biesheuvel wrote:
    > Extend the existing pattern for populating ptdump marker entries at
    > boot, and add handling of VMALLOC_END, which will cease to be a compile
    > time constant for configurations that support 52-bit virtual addressing.
    >
    > Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
    > ---
    > arch/arm64/mm/ptdump.c | 8 +++++++-
    > 1 file changed, 7 insertions(+), 1 deletion(-)
    >
    > diff --git a/arch/arm64/mm/ptdump.c b/arch/arm64/mm/ptdump.c
    > index 76d28056bd14920a..910b35f02280cbdb 100644
    > --- a/arch/arm64/mm/ptdump.c
    > +++ b/arch/arm64/mm/ptdump.c
    > @@ -31,7 +31,12 @@ enum address_markers_idx {
    > PAGE_END_NR,
    > #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
    > KASAN_START_NR,
    > + KASAN_END_NR,
    > #endif
    > + MODULES_NR,
    > + MODULES_END_NR,
    > + VMALLOC_START_NR,
    > + VMALLOC_END_NR,
    > };
    >
    > static struct addr_marker address_markers[] = {
    > @@ -44,7 +49,7 @@ static struct addr_marker address_markers[] = {
    > { MODULES_VADDR, "Modules start" },
    > { MODULES_END, "Modules end" },
    > { VMALLOC_START, "vmalloc() area" },
    > - { VMALLOC_END, "vmalloc() end" },
    > + { 0, "vmalloc() end" },
    > { VMEMMAP_START, "vmemmap start" },
    > { VMEMMAP_START + VMEMMAP_SIZE, "vmemmap end" },
    > { PCI_IO_START, "PCI I/O start" },

    With all the VA layout changes, and the addition of 52-bit PA/VA for 4KB and
    16KB pages, Documentation/arm64/memory.rst now looks very wrong. Suggest
    updating it to reflect reality?



    > @@ -379,6 +384,7 @@ static int __init ptdump_init(void)
    > #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
    > address_markers[KASAN_START_NR].start_address = KASAN_SHADOW_START;
    > #endif
    > + address_markers[VMALLOC_END_NR].start_address = VMALLOC_END;
    > ptdump_initialize();
    > ptdump_debugfs_register(&kernel_ptdump_info, "kernel_page_tables");
    > return 0;

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