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    Subject[RFC PATCH v7 3/7] Restartable sequences: ARM 32 architecture support
    Date
    Call the rseq_handle_notify_resume() function on return to
    userspace if TIF_NOTIFY_RESUME thread flag is set.

    Increment the event counter and perform fixup on the pre-signal frame
    when a signal is delivered on top of a restartable sequence critical
    section.

    Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
    CC: Russell King <linux@arm.linux.org.uk>
    CC: Catalin Marinas <catalin.marinas@arm.com>
    CC: Will Deacon <will.deacon@arm.com>
    CC: Thomas Gleixner <tglx@linutronix.de>
    CC: Paul Turner <pjt@google.com>
    CC: Andrew Hunter <ahh@google.com>
    CC: Peter Zijlstra <peterz@infradead.org>
    CC: Andy Lutomirski <luto@amacapital.net>
    CC: Andi Kleen <andi@firstfloor.org>
    CC: Dave Watson <davejwatson@fb.com>
    CC: Chris Lameter <cl@linux.com>
    CC: Ingo Molnar <mingo@redhat.com>
    CC: Ben Maurer <bmaurer@fb.com>
    CC: Steven Rostedt <rostedt@goodmis.org>
    CC: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
    CC: Josh Triplett <josh@joshtriplett.org>
    CC: Linus Torvalds <torvalds@linux-foundation.org>
    CC: Andrew Morton <akpm@linux-foundation.org>
    CC: Boqun Feng <boqun.feng@gmail.com>
    CC: linux-api@vger.kernel.org
    ---
    arch/arm/Kconfig | 1 +
    arch/arm/kernel/signal.c | 7 +++++++
    2 files changed, 8 insertions(+)

    diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
    index 90542db..636e14b 100644
    --- a/arch/arm/Kconfig
    +++ b/arch/arm/Kconfig
    @@ -75,6 +75,7 @@ config ARM
    select HAVE_PERF_USER_STACK_DUMP
    select HAVE_RCU_TABLE_FREE if (SMP && ARM_LPAE)
    select HAVE_REGS_AND_STACK_ACCESS_API
    + select HAVE_RSEQ
    select HAVE_SYSCALL_TRACEPOINTS
    select HAVE_UID16
    select HAVE_VIRT_CPU_ACCOUNTING_GEN
    diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
    index 7b8f214..907da02 100644
    --- a/arch/arm/kernel/signal.c
    +++ b/arch/arm/kernel/signal.c
    @@ -475,6 +475,12 @@ static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
    int ret;

    /*
    + * Increment event counter and perform fixup for the pre-signal
    + * frame.
    + */
    + rseq_signal_deliver(regs);
    +
    + /*
    * Set up the stack frame
    */
    if (ksig->ka.sa.sa_flags & SA_SIGINFO)
    @@ -594,6 +600,7 @@ do_work_pending(struct pt_regs *regs, unsigned int thread_flags, int syscall)
    } else {
    clear_thread_flag(TIF_NOTIFY_RESUME);
    tracehook_notify_resume(regs);
    + rseq_handle_notify_resume(regs);
    }
    }
    local_irq_disable();
    --
    2.1.4
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