linux-kernel - [tip: core/entry] microblaze: Snapshot thread flags

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Date:   Tue, 30 Nov 2021 23:08:40 -0000
From:   "tip-bot2 for Mark Rutland" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Mark Rutland <mark.rutland@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Michal Simek <michal.simek@...inx.com>,
        "Paul E. McKenney" <paulmck@...nel.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: core/entry] microblaze: Snapshot thread flags

The following commit has been merged into the core/entry branch of tip:

Commit-ID:     e538c5849143a7f0aa97006cd45ce4c0c26d0744
Gitweb:        https://git.kernel.org/tip/e538c5849143a7f0aa97006cd45ce4c0c26d0744
Author:        Mark Rutland <mark.rutland@....com>
AuthorDate:    Mon, 29 Nov 2021 13:06:49 
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Wed, 01 Dec 2021 00:06:44 +01:00

microblaze: Snapshot thread flags

Some thread flags can be set remotely, and so even when IRQs are disabled,
the flags can change under our feet. Generally this is unlikely to cause a
problem in practice, but it is somewhat unsound, and KCSAN will
legitimately warn that there is a data race.

To avoid such issues, a snapshot of the flags has to be taken prior to
using them. Some places already use READ_ONCE() for that, others do not.

Convert them all to the new flag accessor helpers.

Signed-off-by: Mark Rutland <mark.rutland@....com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Tested-by: Michal Simek <michal.simek@...inx.com>
Acked-by: Paul E. McKenney <paulmck@...nel.org>
Link: https://lore.kernel.org/r/20211129130653.2037928-8-mark.rutland@arm.com

---
 arch/microblaze/kernel/signal.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/microblaze/kernel/signal.c b/arch/microblaze/kernel/signal.c
index fc61eb0..23e8a93 100644
--- a/arch/microblaze/kernel/signal.c
+++ b/arch/microblaze/kernel/signal.c
@@ -283,7 +283,7 @@ static void do_signal(struct pt_regs *regs, int in_syscall)
 #ifdef DEBUG_SIG
 	pr_info("do signal: %p %d\n", regs, in_syscall);
 	pr_info("do signal2: %lx %lx %ld [%lx]\n", regs->pc, regs->r1,
-			regs->r12, current_thread_info()->flags);
+			regs->r12, read_thread_flags());
 #endif

 	if (get_signal(&ksig)) {