summaryrefslogtreecommitdiff
path: root/security
diff options
context:
space:
mode:
authorArnd Bergmann <arnd@arndb.de>2021-05-08 01:07:57 +0300
committerArnd Bergmann <arnd@arndb.de>2021-05-17 14:30:29 +0300
commit803f4e1eab7a8938ba3a3c30dd4eb5e9eeef5e63 (patch)
tree4a7096939a4a914eedad1fba212cee0e88ba3ec5 /security
parentd40d8179482c330df5b9049797fe94c2e8eb4f6e (diff)
downloadlinux-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 'security')
0 files changed, 0 insertions, 0 deletions