On 8/22/19 6:14 AM, Stefan Hajnoczi wrote:
On Tue, Aug 20, 2019 at 10:29:58AM -0700, Bart Van Assche wrote:
Order head and tail stores properly against CQE / SQE memory accesses.
Use <asm/barrier.h> instead of the io_uring "barrier.h" header file.
Where does this header file come from?
Linux has an asm-generic/barrier.h file which is not uapi and therefore
not installed in /usr/include.
I couldn't find an asm/barrier.h in the Debian packages collection
either.
There two flavours of the asm/barrier.h header file present in the
kernel tree. I think that the arch/*/include/asm/barrier.h header files
are intended for kernel code and that the tools/include/asm/barrier.h
header file is intended for the user space code in the tools directory.
Bart.
