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Btrfs only supports sectorsize 4K, 8K, 16K, 32K, 64K for now, thus for systems with 4K page size, there is no way the fs is subpage (sectorsize < PAGE_SIZE). So here we define btrfs_is_subpage() different according to the PAGE_SIZE: - PAGE_SIZE > 4K We may hit real subpage cases, define btrfs_is_subpage() as a regular function and do the usual checks. - PAGE_SIZE == 4K (no smaller PAGE_SIZE support AFAIK) There is no way the fs is subpage, so just define btrfs_is_subpage() as an inline function which always return false. This saves about 7K bytes for x86_64 debug builds: text data bss dec hex filename Before: 1484452 168693 25776 1678921 199e49 fs/btrfs/btrfs.ko After: 1476605 168445 25776 1670826 197eaa fs/btrfs/btrfs.ko Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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.