linux-kernel - [PATCH v3 1/1] kdump: append uts_namespace.name offset to VMCOREINFO

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Date:   Wed, 30 Sep 2020 12:23:28 +0200
From:   Alexander Egorenkov <egorenar@...ux.ibm.com>
To:     dyoung@...hat.com, bhe@...hat.com, vgoyal@...hat.com,
        lijiang@...hat.com
Cc:     ebiederm@...ssion.com, akpm@...ux-foundation.org,
        ktkhai@...tuozzo.com, keescook@...omium.org,
        christian.brauner@...ntu.com, kexec@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Alexander Egorenkov <egorenar@...ux.ibm.com>
Subject: [PATCH v3 1/1] kdump: append uts_namespace.name offset to VMCOREINFO

The offset of the field 'init_uts_ns.name' has changed
since commit 9a56493f6942 ("uts: Use generic ns_common::count").

Link: https://lore.kernel.org/r/159644978167.604812.1773586504374412107.stgit@localhost.localdomain

Make the offset of the field 'uts_namespace.name' available
in VMCOREINFO because tools like 'crash-utility' and
'makedumpfile' must be able to read it from crash dumps.

Signed-off-by: Alexander Egorenkov <egorenar@...ux.ibm.com>
---

v2 -> v3:
 * Added documentation to vmcoreinfo.rst
 * Use the short form of the commit reference

v1 -> v2:
 * Improved commit message
 * Added link to the discussion of the uts namespace changes

 Documentation/admin-guide/kdump/vmcoreinfo.rst | 6 ++++++
 kernel/crash_core.c                            | 1 +
 2 files changed, 7 insertions(+)

diff --git a/Documentation/admin-guide/kdump/vmcoreinfo.rst b/Documentation/admin-guide/kdump/vmcoreinfo.rst
index e44a6c01f336..3861a25faae1 100644
--- a/Documentation/admin-guide/kdump/vmcoreinfo.rst
+++ b/Documentation/admin-guide/kdump/vmcoreinfo.rst
@@ -39,6 +39,12 @@ call.
 User-space tools can get the kernel name, host name, kernel release
 number, kernel version, architecture name and OS type from it.
 
+(uts_namespace, name)
+---------------------
+
+Offset of the name's member. Crash Utility and Makedumpfile get
+the start address of the init_uts_ns.name from this.
+
 node_online_map
 ---------------
 
diff --git a/kernel/crash_core.c b/kernel/crash_core.c
index 106e4500fd53..173fdc261882 100644
--- a/kernel/crash_core.c
+++ b/kernel/crash_core.c
@@ -447,6 +447,7 @@ static int __init crash_save_vmcoreinfo_init(void)
 	VMCOREINFO_PAGESIZE(PAGE_SIZE);
 
 	VMCOREINFO_SYMBOL(init_uts_ns);
+	VMCOREINFO_OFFSET(uts_namespace, name);
 	VMCOREINFO_SYMBOL(node_online_map);
 #ifdef CONFIG_MMU
 	VMCOREINFO_SYMBOL_ARRAY(swapper_pg_dir);
-- 
2.26.2