linux-kernel - [tip: locking/kcsan] kcsan: Update Documentation to change supported compilers

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Message-ID: <159016372701.17951.14792231377616807344.tip-bot2@tip-bot2>
Date:   Fri, 22 May 2020 16:08:47 -0000
From:   "tip-bot2 for Marco Elver" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Marco Elver <elver@...gle.com>, Borislav Petkov <bp@...e.de>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Will Deacon <will@...nel.org>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: locking/kcsan] kcsan: Update Documentation to change supported
 compilers

The following commit has been merged into the locking/kcsan branch of tip:

Commit-ID:     345043266de282a4059bc8336e2bcdd3680cc8f0
Gitweb:        https://git.kernel.org/tip/345043266de282a4059bc8336e2bcdd3680cc8f0
Author:        Marco Elver <elver@...gle.com>
AuthorDate:    Thu, 21 May 2020 16:20:43 +02:00
Committer:     Borislav Petkov <bp@...e.de>
CommitterDate: Fri, 22 May 2020 15:13:45 +02:00

kcsan: Update Documentation to change supported compilers

Document change in required compiler version for KCSAN, and remove the
now redundant note about __no_kcsan and inlining problems with older
compilers.

Signed-off-by: Marco Elver <elver@...gle.com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Acked-by: Will Deacon <will@...nel.org>
Link: https://lkml.kernel.org/r/20200521142047.169334-8-elver@google.com
---
 Documentation/dev-tools/kcsan.rst |  9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/Documentation/dev-tools/kcsan.rst b/Documentation/dev-tools/kcsan.rst
index f4b5766..ce4bbd9 100644
--- a/Documentation/dev-tools/kcsan.rst
+++ b/Documentation/dev-tools/kcsan.rst
@@ -8,8 +8,7 @@ approach to detect races. KCSAN's primary purpose is to detect `data races`_.
 Usage
 -----
 
-KCSAN is supported in both GCC and Clang. With GCC it requires version 7.3.0 or
-later. With Clang it requires version 7.0.0 or later.
+KCSAN requires Clang version 11 or later.
 
 To enable KCSAN configure the kernel with::
 
@@ -121,12 +120,6 @@ the below options are available:
     static __no_kcsan_or_inline void foo(void) {
         ...
 
-  Note: Older compiler versions (GCC < 9) also do not always honor the
-  ``__no_kcsan`` attribute on regular ``inline`` functions. If false positives
-  with these compilers cannot be tolerated, for small functions where
-  ``__always_inline`` would be appropriate, ``__no_kcsan_or_inline`` should be
-  preferred instead.
-
 * To disable data race detection for a particular compilation unit, add to the
   ``Makefile``::