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author | Arnd Bergmann <arnd@arndb.de> | 2021-05-08 01:07:57 +0300 |
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committer | Arnd Bergmann <arnd@arndb.de> | 2021-05-17 14:30:29 +0300 |
commit | 803f4e1eab7a8938ba3a3c30dd4eb5e9eeef5e63 (patch) | |
tree | 4a7096939a4a914eedad1fba212cee0e88ba3ec5 /arch/ia64/include/asm/pgalloc.h | |
parent | d40d8179482c330df5b9049797fe94c2e8eb4f6e (diff) | |
download | linux-803f4e1eab7a8938ba3a3c30dd4eb5e9eeef5e63.tar.xz |
asm-generic: simplify asm/unaligned.h
The get_unaligned()/put_unaligned() implementations are much more complex
than necessary, now that all architectures use the same code.
Move everything into one file and use a much more compact way to express
the same logic.
I've compared the binary output using gcc-11 across defconfig builds for
all architectures and found this patch to make no difference, except for
a single function on powerpc that needs two additional register moves
because of random differences in register allocation.
There are a handful of callers of the low-level __get_unaligned_cpu32,
so leave that in place for the time being even though the common code
no longer uses it.
This adds a warning for any caller of get_unaligned()/put_unaligned()
that passes in a single-byte pointer, but I've sent patches for all
instances that show up in x86 and randconfig builds. It would be nice
to change the arguments of the endian-specific accessors to take the
matching __be16/__be32/__be64/__le16/__le32/__le64 arguments instead of
a void pointer, but that requires more changes to the rest of the kernel.
This new version does allow aggregate types into get_unaligned(), which
was not the original goal but might come in handy.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/ia64/include/asm/pgalloc.h')
0 files changed, 0 insertions, 0 deletions