----- Original Message -----
>
> Commit dd12805ed1db7 ("XArray: Remove radix tree compatibility") on
> linux-next changes the definition of 'radix_tree_root' back to be a struct.
> The content however differs from the original 'struct radix_tree_root'.
> Thus attempts to debug current linux-next kernels fail with 'radix trees do
> not exist or have changed their format'. Because the new 'struct
> radix_tree_root' and 'struct xarray' have nearly the same layout the
> functionality for XArrays can be reused.
Hi Philipp,
The patch looks good, and doesn't break backwards-compatibility. If by chance
Matthew changes the linux-next kernel patch, this one can always be revisited.
Queued for crash-7.2.6:
https://github.com/crash-utility/crash/commit/4d551127014e3ad4014e6e8811bcf86d4a53d723
Thanks,
Dave
>
> Signed-off-by: Philipp Rudo <prudo linux ibm com>
> ---
> bpf.c | 7 ++++++-
> filesys.c | 4 +++-
> ipcs.c | 5 ++++-
> kernel.c | 11 ++++++++---
> task.c | 15 +++++++++++----
> tools.c | 5 ++++-
> 6 files changed, 36 insertions(+), 11 deletions(-)
>
> diff --git a/bpf.c b/bpf.c
> index 6eacb9a..056e286 100644
> --- a/bpf.c
> +++ b/bpf.c
> @@ -221,7 +221,12 @@ bpf_init(struct bpf_info *bpf)
> bpf->idr_type = IDR_ORIG;
> do_old_idr(IDR_ORIG_INIT, 0, NULL);
> } else if (STREQ(MEMBER_TYPE_NAME("idr", "idr_rt"), "radix_tree_root"))
> - bpf->idr_type = IDR_RADIX;
> + if (MEMBER_EXISTS("radix_tree_root", "rnode"))
> + bpf->idr_type = IDR_RADIX;
> + else if (MEMBER_EXISTS("radix_tree_root", "xa_head"))
> + bpf->idr_type = IDR_XARRAY;
> + else
> + error(FATAL, "cannot determine IDR list type\n");
> else if (STREQ(MEMBER_TYPE_NAME("idr", "idr_rt"), "xarray"))
> bpf->idr_type = IDR_XARRAY;
> else
> diff --git a/filesys.c b/filesys.c
> index 9305627..6abba0b 100644
> --- a/filesys.c
> +++ b/filesys.c
> @@ -2217,7 +2217,9 @@ dump_inode_page_cache_info(ulong inode)
>
> xarray = root_rnode = count = 0;
> if (MEMBER_EXISTS("address_space", "i_pages") &&
> - STREQ(MEMBER_TYPE_NAME("address_space", "i_pages"), "xarray"))
> + (STREQ(MEMBER_TYPE_NAME("address_space", "i_pages"), "xarray") ||
> + (STREQ(MEMBER_TYPE_NAME("address_space", "i_pages"), "radix_tree_root") &&
> + MEMBER_EXISTS("radix_tree_root", "xa_head"))))
> xarray = i_mapping + OFFSET(address_space_page_tree);
> else
> root_rnode = i_mapping + OFFSET(address_space_page_tree);
> diff --git a/ipcs.c b/ipcs.c
> index 2553bac..3c26620 100644
> --- a/ipcs.c
> +++ b/ipcs.c
> @@ -206,7 +206,10 @@ ipcs_init(void)
> if (STREQ(MEMBER_TYPE_NAME("idr", "idr_rt"), "xarray"))
> ipcs_table.init_flags |= IDR_XARRAY;
> else
> - ipcs_table.init_flags |= IDR_RADIX;
> + if (MEMBER_EXISTS("radix_tree_root", "rnode"))
> + ipcs_table.init_flags |= IDR_RADIX;
> + else if (MEMBER_EXISTS("radix_tree_root", "xa_head"))
> + ipcs_table.init_flags |= IDR_XARRAY;
> } else
> ipcs_table.init_flags |= IDR_ORIG;
>
> diff --git a/kernel.c b/kernel.c
> index 9f5ba89..8080097 100644
> --- a/kernel.c
> +++ b/kernel.c
> @@ -534,9 +534,14 @@ kernel_init()
>
> if (kernel_symbol_exists("irq_desc_tree")) {
> get_symbol_type("irq_desc_tree", NULL, &req);
> - kt->flags2 |= STREQ(req.type_tag_name, "xarray") ?
> - IRQ_DESC_TREE_XARRAY : IRQ_DESC_TREE_RADIX;
> -
> + if (STREQ(req.type_tag_name, "xarray")) {
> + kt->flags2 |= IRQ_DESC_TREE_XARRAY;
> + } else {
> + if (MEMBER_EXISTS("radix_tree_root", "xa_head"))
> + kt->flags2 |= IRQ_DESC_TREE_XARRAY;
> + else
> + kt->flags2 |= IRQ_DESC_TREE_RADIX;
> + }
> }
> STRUCT_SIZE_INIT(irq_data, "irq_data");
> if (VALID_STRUCT(irq_data)) {
> diff --git a/task.c b/task.c
> index cd118e5..36a90d6 100644
> --- a/task.c
> +++ b/task.c
> @@ -507,10 +507,17 @@ task_init(void)
> OFFSET(pid_namespace_idr) + OFFSET(idr_idr_rt);
> tt->flags |= PID_XARRAY;
> } else if STREQ(MEMBER_TYPE_NAME("idr", "idr_rt"), "radix_tree_root") {
> - tt->refresh_task_table = refresh_radix_tree_task_table;
> - tt->pid_radix_tree = symbol_value("init_pid_ns") +
> - OFFSET(pid_namespace_idr) + OFFSET(idr_idr_rt);
> - tt->flags |= PID_RADIX_TREE;
> + if (MEMBER_EXISTS("radix_tree_root", "rnode")) {
> + tt->refresh_task_table = refresh_radix_tree_task_table;
> + tt->pid_radix_tree = symbol_value("init_pid_ns") +
> + OFFSET(pid_namespace_idr) + OFFSET(idr_idr_rt);
> + tt->flags |= PID_RADIX_TREE;
> + } else if (MEMBER_EXISTS("radix_tree_root", "xa_head")) {
> + tt->refresh_task_table = refresh_xarray_task_table;
> + tt->pid_xarray = symbol_value("init_pid_ns") +
> + OFFSET(pid_namespace_idr) + OFFSET(idr_idr_rt);
> + tt->flags |= PID_XARRAY;
> + }
> } else
> error(FATAL, "unknown pid_namespace.idr type: %s\n",
> MEMBER_TYPE_NAME("idr", "idr_rt"));
> diff --git a/tools.c b/tools.c
> index 72ec76a..43b838a 100644
> --- a/tools.c
> +++ b/tools.c
> @@ -4241,7 +4241,10 @@ cmd_tree()
> }
>
> if (STRNEQ(optarg, "ra"))
> - type_flag = RADIXTREE_REQUEST;
> + if (MEMBER_EXISTS("radix_tree_root", "xa_head"))
> + type_flag = XARRAY_REQUEST;
> + else
> + type_flag = RADIXTREE_REQUEST;
> else if (STRNEQ(optarg, "rb"))
> type_flag = RBTREE_REQUEST;
> else if (STRNEQ(optarg, "x"))
> --
> 2.16.4
>
--
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