ARM: entry: Reimplement local restart in C
The former local restart hack to restart syscalls inside
the kernel if we get restart signals while processing a
system call was deleted when converting the architecture
to generic entry.
This makes strace tests fail so the hack is necessary.
Now, after the conversion to generic entry, restore the
order by reimplementing this with two TIF flags that
help us to issue system call restarts immediately in the
kernel.
This is essentially a reimplementation of commit 81783786d5cf
"ARM: 7473/1: deal with handlerless restarts without leaving
the kernel" from 2012, but in C, on top of generic entry.
Link: http://lists.infradead.org/pipermail/linux-arm-kernel/2012-June/104733.html
Link: https://lore.kernel.org/all/1340377626-17075-1-git-send-email-will.deacon@arm.com/
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
3 files changed
