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kcsan: Re-add GCC as a supported compiler

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GCC version 11 recently implemented all requirements to correctly
support KCSAN:

1. Correct no_sanitize-attribute inlining behaviour:
   https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=4089df8ef4a63126b0774c39b6638845244c20d2

2. --param=tsan-distinguish-volatile
   https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=ab2789ec507a94f1a75a6534bca51c7b39037ce0

3. --param=tsan-instrument-func-entry-exit
   https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=06712fc68dc9843d9af7c7ac10047f49d305ad76

Therefore, we can re-enable GCC for KCSAN, and document the new compiler
requirements.

Signed-off-by: Marco Elver <elver@google.com>
Cc: Martin Liska <mliska@suse.cz>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Marco Elver 2020-06-18 11:31:16 +02:00 committed by Paul E. McKenney
parent 56b031f0ab
commit e68dcd8eac
3 changed files with 5 additions and 3 deletions
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3
Documentation/dev-tools/kcsan.rst
View File

@ -8,7 +8,8 @@ approach to detect races. KCSAN's primary purpose is to detect `data races`_.
Usage
-----
KCSAN requires Clang version 11 or later.
KCSAN is supported by both GCC and Clang. With GCC we require version 11 or
later, and with Clang also require version 11 or later.
To enable KCSAN configure the kernel with::

3
lib/Kconfig.kcsan
View File

@ -4,7 +4,8 @@ config HAVE_ARCH_KCSAN
bool
config HAVE_KCSAN_COMPILER
def_bool CC_IS_CLANG && $(cc-option,-fsanitize=thread -mllvm -tsan-distinguish-volatile=1)
def_bool (CC_IS_CLANG && $(cc-option,-fsanitize=thread -mllvm -tsan-distinguish-volatile=1)) || \
(CC_IS_GCC && $(cc-option,-fsanitize=thread --param tsan-distinguish-volatile=1))
help
For the list of compilers that support KCSAN, please see
<file:Documentation/dev-tools/kcsan.rst>.

2
scripts/Makefile.kcsan
View File

@ -6,7 +6,7 @@ ifdef CONFIG_KCSAN
ifdef CONFIG_CC_IS_CLANG
cc-param = -mllvm -$(1)
else
cc-param = --param -$(1)
cc-param = --param $(1)
endif
# Keep most options here optional, to allow enabling more compilers if absence