linux-toradex.git/init/version.c, branch v5.12-rc5

init/version.c: remove Version_ symbol

2021-02-26T17:41:04+00:00

This code hunk creates a Version_ symbol if
CONFIG_KALLSYMS is disabled.  For example, building the kernel v5.10 for
allnoconfig creates the following symbol:

  $ nm vmlinux | grep Version_
  c116b028 B Version_330240

There is no in-tree user of this symbol.

Commit 197dcffc8ba0 ("init/version.c: define version_string only if
CONFIG_KALLSYMS is not defined") mentions that Version_* is only used
with ksymoops.

However, a commit in the pre-git era [1] had added the statement,
"ksymoops is useless on 2.6.  Please use the Oops in its original format".

That statement existed until commit 4eb9241127a0 ("Documentation:
admin-guide: update bug-hunting.rst") finally removed the stale
ksymoops information.

This symbol is no longer needed.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/history/history.git/commit/?id=ad68b2f085f5c79e4759ca2d13947b3c885ee831

Link: https://lkml.kernel.org/r/20210120033452.2895170-1-masahiroy@kernel.org
Signed-off-by: Masahiro Yamada 
Cc: Mauro Carvalho Chehab 
Cc: Randy Dunlap 
Cc: Daniel Guilak 
Cc: Lee Revell 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

uts: Use generic ns_common::count

2020-08-19T12:13:20+00:00

Switch over uts namespaces to use the newly introduced common lifetime
counter.

Currently every namespace type has its own lifetime counter which is stored
in the specific namespace struct. The lifetime counters are used
identically for all namespaces types. Namespaces may of course have
additional unrelated counters and these are not altered.

This introduces a common lifetime counter into struct ns_common. The
ns_common struct encompasses information that all namespaces share. That
should include the lifetime counter since its common for all of them.

It also allows us to unify the type of the counters across all namespaces.
Most of them use refcount_t but one uses atomic_t and at least one uses
kref. Especially the last one doesn't make much sense since it's just a
wrapper around refcount_t since 2016 and actually complicates cleanup
operations by having to use container_of() to cast the correct namespace
struct out of struct ns_common.

Having the lifetime counter for the namespaces in one place reduces
maintenance cost. Not just because after switching all namespaces over we
will have removed more code than we added but also because the logic is
more easily understandable and we indicate to the user that the basic
lifetime requirements for all namespaces are currently identical.

Signed-off-by: Kirill Tkhai 
Reviewed-by: Kees Cook 
Acked-by: Christian Brauner 
Link: https://lore.kernel.org/r/159644978167.604812.1773586504374412107.stgit@localhost.localdomain
Signed-off-by: Christian Brauner

treewide: Add SPDX license identifier for missed files

2019-05-21T08:50:45+00:00

Add SPDX license identifiers to all files which:

 - Have no license information of any form

 - Have EXPORT_.*_SYMBOL_GPL inside which was used in the
   initial scan/conversion to ignore the file

These files fall under the project license, GPL v2 only. The resulting SPDX
license identifier is:

  GPL-2.0-only

Signed-off-by: Thomas Gleixner 
Signed-off-by: Greg Kroah-Hartman

kbuild: Add build salt to the kernel and modules

2018-07-17T16:18:05+00:00

In Fedora, the debug information is packaged separately (foo-debuginfo) and
can be installed separately. There's been a long standing issue where only
one version of a debuginfo info package can be installed at a time. There's
been an effort for Fedora for parallel debuginfo to rectify this problem.

Part of the requirement to allow parallel debuginfo to work is that build ids
are unique between builds. The existing upstream rpm implementation ensures
this by re-calculating the build-id using the version and release as a
seed. This doesn't work 100% for the kernel because of the vDSO which is
its own binary and doesn't get updated when embedded.

Fix this by adding some data in an ELF note for both the kernel and modules.
The data is controlled via a Kconfig option so distributions can set it
to an appropriate value to ensure uniqueness between builds.

Suggested-by: Masahiro Yamada 
Signed-off-by: Laura Abbott 
Signed-off-by: Masahiro Yamada

init/version.c: include instead of

2017-11-18T00:10:02+00:00

init/version.c has nothing to do with modules, so remove the
.

Instead, include  for EXPORT_SYMBOL_GPL.

This cuts off a lot of unnecessary header parsing.

Link: http://lkml.kernel.org/r/1505920984-8523-1-git-send-email-yamada.masahiro@socionext.com
Signed-off-by: Masahiro Yamada 
Cc: Paul Gortmaker 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

locking/atomic, kref: Add KREF_INIT()

2017-01-14T10:37:18+00:00

Since we need to change the implementation, stop exposing internals.

Provide KREF_INIT() to allow static initialization of struct kref.

Signed-off-by: Peter Zijlstra (Intel) 
Cc: Andrew Morton 
Cc: Greg Kroah-Hartman 
Cc: Linus Torvalds 
Cc: Paul E. McKenney 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar

copy address of proc_ns_ops into ns_common

2014-12-04T19:34:47+00:00

Signed-off-by: Al Viro

common object embedded into various struct ....ns

2014-12-04T19:31:00+00:00

for now - just move corresponding ->proc_inum instances over there

Acked-by: "Eric W. Biederman" 
Signed-off-by: Al Viro

proc: Split the namespace stuff out into linux/proc_ns.h

2013-05-01T21:29:39+00:00

Split the proc namespace stuff out into linux/proc_ns.h.

Signed-off-by: David Howells 
cc: netdev@vger.kernel.org
cc: Serge E. Hallyn 
cc: Eric W. Biederman 
Signed-off-by: Al Viro

proc: Usable inode numbers for the namespace file descriptors.

2012-11-20T12:19:49+00:00

Assign a unique proc inode to each namespace, and use that
inode number to ensure we only allocate at most one proc
inode for every namespace in proc.

A single proc inode per namespace allows userspace to test
to see if two processes are in the same namespace.

This has been a long requested feature and only blocked because
a naive implementation would put the id in a global space and
would ultimately require having a namespace for the names of
namespaces, making migration and certain virtualization tricks
impossible.

We still don't have per superblock inode numbers for proc, which
appears necessary for application unaware checkpoint/restart and
migrations (if the application is using namespace file descriptors)
but that is now allowd by the design if it becomes important.

I have preallocated the ipc and uts initial proc inode numbers so
their structures can be statically initialized.

Signed-off-by: Eric W. Biederman