linux-kernel - [GIT PULL] KCSAN changes for v6.10

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Date: Sun, 12 May 2024 10:33:08 -0700
From: "Paul E. McKenney" <paulmck@...nel.org>
To: torvalds@...ux-foundation.org
Cc: linux-kernel@...r.kernel.org, kasan-dev@...glegroups.com,
	kernel-team@...a.com, elver@...gle.com,
	penguin-kernel@...ove.sakura.ne.jp
Subject: [GIT PULL] KCSAN changes for v6.10

Hello, Linus,

Once the v6.4 merge window opens, please pull the latest KCSAN git
commit from:

  git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git tags/kcsan.2024.05.10a

  # HEAD: 31f605a308e627f06e4e6ab77254473f1c90f0bf: kcsan, compiler_types: Introduce __data_racy type qualifier (2024-05-07 11:39:50 -0700)

----------------------------------------------------------------
kcsan: Introduce __data_racy type qualifier

This commit adds a __data_racy type qualifier that enables kernel
developers to inform KCSAN that a given variable is a shared variable
without needing to mark each and every access.  This allows pre-KCSAN
code to be correctly (if approximately) instrumented withh very little
effort, and also provides people reading the code a clear indication that
the variable is in fact shared.  In addition, it permits incremental
transition to per-access KCSAN marking, so that (for example) a given
subsystem can be transitioned one variable at a time, while avoiding
large numbers of KCSAN warnings during this transition.

----------------------------------------------------------------
Marco Elver (1):
      kcsan, compiler_types: Introduce __data_racy type qualifier

 Documentation/dev-tools/kcsan.rst | 10 ++++++++++
 include/linux/compiler_types.h    |  7 +++++++
 kernel/kcsan/kcsan_test.c         | 17 +++++++++++++++++
 3 files changed, 34 insertions(+)