Originally I suggested to implement READ_ONCE_NOCHECK(), like this:
#define READ_ONCE_NOCHECK(x) \
{( typeof(x) __val; \
kasan_disable_local(); \
__val = READ_ONCE(x); \
kasan_enable_local(); \
__val;\
)}
But then I realised that we can't put this into linux/compiler.h
since it requires to add some includes (we need linux/kasan.h which
also requires linux/sched.h). It's not even that simple to put this into
kernel.h
So I've come to another approach, see the first patch for details.
Pros:
- It generates more efficient code rather than variant above
Cons:
- REAS_ONCE() becomes rather messy.
Andrey Ryabinin (2):
Provide READ_ONCE_NOCHECK()
x86/process: Silence KASAN warnings in get_wchan()
arch/x86/kernel/process.c | 6 +++---
include/linux/compiler-gcc.h | 13 ++++++++++++
include/linux/compiler.h | 49 ++++++++++++++++++++++++++++++++------------
3 files changed, 52 insertions(+), 16 deletions(-)
--
2.4.9
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