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Mark Rutland ea1432a402 locking/atomic: arm: fix sync ops 
[ Upstream commit dda5f312bb ]

The sync_*() ops on arch/arm are defined in terms of the regular bitops
with no special handling. This is not correct, as UP kernels elide
barriers for the fully-ordered operations, and so the required ordering
is lost when such UP kernels are run under a hypervsior on an SMP
system.

Fix this by defining sync ops with the required barriers.

Note: On 32-bit arm, the sync_*() ops are currently only used by Xen,
which requires ARMv7, but the semantics can be implemented for ARMv6+.

Fixes: e54d2f6152 ("xen/arm: sync_bitops")
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20230605070124.3741859-2-mark.rutland@arm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-07-19 16:21:02 +02:00
..
alpha
mm/fault: convert remaining simple cases to lock_mm_and_find_vma()
2023-07-01 13:16:25 +02:00
arc
mm/fault: convert remaining simple cases to lock_mm_and_find_vma()
2023-07-01 13:16:25 +02:00
arm
locking/atomic: arm: fix sync ops
2023-07-19 16:21:02 +02:00
arm64
arm64/mm: Convert to using lock_mm_and_find_vma()
2023-07-01 13:16:24 +02:00
csky
csky: fix up lock_mm_and_find_vma() conversion
2023-07-01 13:16:27 +02:00
hexagon
mm/fault: convert remaining simple cases to lock_mm_and_find_vma()
2023-07-01 13:16:25 +02:00
ia64
mm: always expand the stack with the mmap write lock held
2023-07-01 13:16:25 +02:00
loongarch
mm/fault: convert remaining simple cases to lock_mm_and_find_vma()
2023-07-01 13:16:25 +02:00
m68k
mm: always expand the stack with the mmap write lock held
2023-07-01 13:16:25 +02:00
microblaze
mm: always expand the stack with the mmap write lock held
2023-07-01 13:16:25 +02:00
mips
mips/mm: Convert to using lock_mm_and_find_vma()
2023-07-01 13:16:24 +02:00
nios2
mm/fault: convert remaining simple cases to lock_mm_and_find_vma()
2023-07-01 13:16:25 +02:00
openrisc
mm: always expand the stack with the mmap write lock held
2023-07-01 13:16:25 +02:00
parisc
parisc: fix expand_stack() conversion
2023-07-01 13:16:26 +02:00
powerpc
powerpc/mm: convert coprocessor fault to lock_mm_and_find_vma()
2023-07-01 13:16:25 +02:00
riscv
riscv/mm: Convert to using lock_mm_and_find_vma()
2023-07-01 13:16:24 +02:00
s390
mm: always expand the stack with the mmap write lock held
2023-07-01 13:16:25 +02:00
sh
mm/fault: convert remaining simple cases to lock_mm_and_find_vma()
2023-07-01 13:16:25 +02:00
sparc
sparc32: fix lock_mm_and_find_vma() conversion
2023-07-01 13:16:26 +02:00
um
mm: always expand the stack with the mmap write lock held
2023-07-01 13:16:25 +02:00
x86
x86/mm: Fix __swp_entry_to_pte() for Xen PV guests
2023-07-19 16:21:02 +02:00
xtensa
mm/fault: convert remaining simple cases to lock_mm_and_find_vma()
2023-07-01 13:16:25 +02:00
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