The use of kmap_atomic/kunmap_atomic is deprecated. The purpose of
kmap-like functions is to create temporary mappings.
kmap_atomic() typically disables preemption, while kmap_local_page()
allows preemption.
According to the documentation, kmap_atomic() is primarily necessary
for contexts that cannot sleep.
> kmap_atomic() may also be used by interrupt contexts, since it does
> not sleep and the callers too may not sleep until after
> kunmap_atomic() is called.
> kunmap_atomic() may implicitly depend on the side effects of atomic
> mappings, i.e. disabling page faults or preemption, or both. In that
> case, explicit calls to pagefault_disable() or preempt_disable() or
> both must be made in conjunction with the use of kmap_local_page().
Link: https://docs.kernel.org/mm/highmem.html#temporary-virtual-mappings
Link: https://lwn.net/Articles/836144/
Keke Ming (5):
riscv/uprobes: use kmap_local_page() in arch_uprobe_copy_ixol()
arm64/uprobes: use kmap_local_page() in arch_uprobe_copy_ixol()
mips/uprobes: use kmap_local_page() in arch_uprobe_copy_ixol()
arm/uprobes: use kmap_local_page() in arch_uprobe_copy_ixol()
uprobes: use kmap_local_page() for temporary page mappings
arch/arm/probes/uprobes/core.c | 4 ++--
arch/arm64/kernel/probes/uprobes.c | 4 ++--
arch/mips/kernel/uprobes.c | 4 ++--
arch/riscv/kernel/probes/uprobes.c | 4 ++--
kernel/events/uprobes.c | 12 ++++++------
5 files changed, 14 insertions(+), 14 deletions(-)
--
2.43.0