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Documentation/sparse: add hints about __CHECKER__

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Several attributes depend on __CHECKER__, but previously there was no
clue in the tree about when __CHECKER__ might be defined.  Add hints at
the most common places (__kernel, __user, __iomem, __bitwise) and in the
sparse documentation.

Link: https://lkml.kernel.org/r/20220310220927.245704-3-helgaas@kernel.org
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: "Michael S . Tsirkin" <mst@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Bjorn Helgaas 2022-03-23 16:05:32 -07:00 committed by Linus Torvalds
parent c724c866bb
commit 179fd6ba3b
3 changed files with 4 additions and 0 deletions
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2
Documentation/dev-tools/sparse.rst
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@ -100,3 +100,5 @@ have already built it.
The optional make variable CF can be used to pass arguments to sparse. The The optional make variable CF can be used to pass arguments to sparse. The
build system passes -Wbitwise to sparse automatically. build system passes -Wbitwise to sparse automatically.
Note that sparse defines the __CHECKER__ preprocessor symbol.

1
include/linux/compiler_types.h
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@ -4,6 +4,7 @@
#ifndef __ASSEMBLY__ #ifndef __ASSEMBLY__
/* sparse defines __CHECKER__; see Documentation/dev-tools/sparse.rst */
#ifdef __CHECKER__ #ifdef __CHECKER__
/* address spaces */ /* address spaces */
# define __kernel __attribute__((address_space(0))) # define __kernel __attribute__((address_space(0)))

1
include/uapi/linux/types.h
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@ -19,6 +19,7 @@
* any application/library that wants linux/types.h. * any application/library that wants linux/types.h.
*/ */
/* sparse defines __CHECKER__; see Documentation/dev-tools/sparse.rst */
#ifdef __CHECKER__ #ifdef __CHECKER__
#define __bitwise __attribute__((bitwise)) #define __bitwise __attribute__((bitwise))
#else #else