Arnd Bergmann 778aaefb8e asm-generic: unaligned always use struct helpers ... As found by Vineet Gupta and Linus Torvalds, gcc has somewhat unexpected behavior when faced with overlapping unaligned pointers. The kernel's unaligned/access-ok.h header technically invokes undefined behavior that happens to usually work on the architectures using it, but if the compiler optimizes code based on the assumption that undefined behavior doesn't happen, it can create output that actually causes data corruption. A related problem was previously found on 32-bit ARMv7, where most instructions can be used on unaligned data, but 64-bit ldrd/strd causes an exception. The workaround was to always use the unaligned/le_struct.h helper instead of unaligned/access-ok.h, in commit 1cce91dfc8 ("ARM: 8715/1: add a private asm/unaligned.h"). The same solution should work on all other architectures as well, so remove the access-ok.h variant and use the other one unconditionally on all architectures, picking either the big-endian or little-endian version. With this, the arm specific header can be removed as well, and the only file including linux/unaligned/access_ok.h gets moved to including the normal file. Fortunately, this made almost no difference to the object code produced by gcc-11. On x86, s390, powerpc, and arc, the resulting binary appears to be identical to the previous version, while on arm64 and m68k there are minimal differences that looks like an optimization pass went into a different direction, usually using fewer stack spills on the new version. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100363		2021-05-10 17:50:47 +02:00
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acpi	Merge branches 'acpi-cppc', 'acpi-video' and 'acpi-utils'	2021-04-26 17:04:27 +02:00
asm-generic	asm-generic: unaligned always use struct helpers	2021-05-10 17:50:47 +02:00
clocksource	ARM: platform support for Apple M1	2021-04-26 12:30:36 -07:00
crypto
drm
dt-bindings	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input	2021-05-06 23:37:55 -07:00
keys	integrity-v5.13	2021-05-01 15:32:18 -07:00
kunit
kvm
linux	asm-generic: unaligned always use struct helpers	2021-05-10 17:50:47 +02:00
math-emu
media	media updates for v5.13-rc1	2021-04-28 09:24:36 -07:00
memory
misc
net	Networking fixes for 5.13-rc1, including fixes from bpf, can	2021-05-08 08:31:46 -07:00
pcmcia
ras
rdma
scsi	SCSI misc on 20210428	2021-04-28 17:22:10 -07:00
soc	Networking changes for 5.13.	2021-04-29 11:57:23 -07:00
sound	ASoC: Updates for v5.13	2021-04-26 16:59:21 +02:00
target
trace	NFS client updates for Linux 5.13	2021-05-07 11:23:41 -07:00
uapi	Networking fixes for 5.13-rc1, including fixes from bpf, can	2021-05-08 08:31:46 -07:00
vdso
video
xen	Merge branch 'akpm' (patches from Andrew)	2021-05-07 00:34:51 -07:00