Hi Pingfan,
On Thu, 25 Mar 2021 at 08:37, Pingfan Liu <piliu@xxxxxxxxxx> wrote:
>
> Renaming, so it is better to reflect the flip layout of kernel VA, which
> is introduced by kernel commit 14c127c957c1 ("arm64: mm: Flip kernel VA space")
>
> Signed-off-by: Pingfan Liu <piliu@xxxxxxxxxx>
> Cc: HAGIO KAZUHITO <k-hagio-ab@xxxxxxx>
> Cc: Lianbo Jiang <lijiang@xxxxxxxxxx>
> Cc: Mark Salter <msalter@xxxxxxxxxx>
> Cc: Mark Langsdorf <mlangsdo@xxxxxxxxxx>
> Cc: Jeremy Linton <jlinton@xxxxxxxxxx>
> To: crash-utility@xxxxxxxxxx
> ---
> arm64.c | 8 ++++----
> defs.h | 3 ++-
> 2 files changed, 6 insertions(+), 5 deletions(-)
>
> diff --git a/arm64.c b/arm64.c
> index a0bee62..132a39d 100644
> --- a/arm64.c
> +++ b/arm64.c
> @@ -221,9 +221,9 @@ arm64_init(int when)
> arm64_calc_KERNELPACMASK();
> ms = machdep->machspec;
> if (ms->VA_BITS_ACTUAL) {
> - ms->page_offset = ARM64_PAGE_OFFSET_ACTUAL;
> - machdep->identity_map_base = ARM64_PAGE_OFFSET_ACTUAL;
> - machdep->kvbase = ARM64_PAGE_OFFSET_ACTUAL;
> + ms->page_offset = ARM64_FLIP_PAGE_OFFSET_ACTUAL;
> + machdep->identity_map_base = ARM64_FLIP_PAGE_OFFSET_ACTUAL;
> + machdep->kvbase = ARM64_FLIP_PAGE_OFFSET_ACTUAL;
> ms->userspace_top = ARM64_USERSPACE_TOP_ACTUAL;
> } else {
> ms->page_offset = ARM64_PAGE_OFFSET;
> @@ -404,7 +404,7 @@ arm64_init(int when)
> fprintf(fp, "CONFIG_ARM64_VA_BITS: %ld\n", ms->CONFIG_ARM64_VA_BITS);
> fprintf(fp, " VA_BITS_ACTUAL: %ld\n", ms->VA_BITS_ACTUAL);
> fprintf(fp, "(calculated) VA_BITS: %ld\n", ms->VA_BITS);
> - fprintf(fp, " PAGE_OFFSET: %lx\n", ARM64_PAGE_OFFSET_ACTUAL);
> + fprintf(fp, " PAGE_OFFSET: %lx\n", ARM64_FLIP_PAGE_OFFSET_ACTUAL);
> fprintf(fp, " VA_START: %lx\n", ms->VA_START);
> fprintf(fp, " modules: %lx - %lx\n", ms->modules_vaddr, ms->modules_end);
> fprintf(fp, " vmalloc: %lx - %lx\n", ms->vmalloc_start_addr, ms->vmalloc_end);
> diff --git a/defs.h b/defs.h
> index 64f2bcb..d8e0f30 100644
> --- a/defs.h
> +++ b/defs.h
> @@ -3219,7 +3219,8 @@ typedef signed int s32;
>
> #define ARM64_PAGE_OFFSET ((0xffffffffffffffffUL) \
> << (machdep->machspec->VA_BITS - 1))
> -#define ARM64_PAGE_OFFSET_ACTUAL ((0xffffffffffffffffUL) \
> +/* after kernel commit 14c127c957c1 ("arm64: mm: Flip kernel VA space") */
Normally, we use kernel versions instead of the kernel commit in
comments. So something like, for kernels > v5.4 the kernel VA space is
flipped.
> +#define ARM64_FLIP_PAGE_OFFSET_ACTUAL ((0xffffffffffffffffUL) \
> - ((1UL) << machdep->machspec->VA_BITS_ACTUAL) + 1)
Thanks,
Bhupesh
> #define ARM64_USERSPACE_TOP ((1UL) << machdep->machspec->VA_BITS)
> --
> 2.29.2
>
> --
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