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413187f790
Currently, TRAILING_OVERLAP() token-pastes the FAM parameter into the
name of internal pdding member `__offset_to_##FAM`. This forces FAM to
be a single identifier, which prevents callers from using a FAM when
it's a nested member. For instance, see the following scenario:
| struct flex {
| size_t count;
| int data[];
| };
| struct foo {
| int hdr_foo;
| struct flex f;
| };
| struct composite {
| struct foo hdr;
| int data[100];
| };
In this case, it'd be useful if TRAILING_OVERLAP() could be used in
the following way:
| struct composite {
| TRAILING_OVERLAP(struct foo, hdr, f.data,
| int data[100];
| );
| };
However, this is not current possible due to the token concatenation
in `__offset_to_##FAM`, which fails when FAM contains a dot.
So, remove token-pasting and use the fixed internal name
`__offset_to_FAM` and, with this, expand the capabilities of
TRAILING_OVERLAP(). :)
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/13b3e0a69aad837b4e32ca8269b9d91bf1fbe9ef.1758115257.git.gustavoars@kernel.org
Signed-off-by: Kees Cook <kees@kernel.org>
|
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.