tree 5ee89c56ec9118904cbd94a5b1208be50d68117a
parent e703b7e247503b8bf87b62c02a4392749b09eca8
author Waiman Long <longman@redhat.com> 1754921507 -0400
committer Thomas Gleixner <tglx@linutronix.de> 1754927601 +0200

futex: Use user_write_access_begin/_end() in futex_put_value()

Commit cec199c5e39b ("futex: Implement FUTEX2_NUMA") introduced the
futex_put_value() helper to write a value to the given user
address.

However, it uses user_read_access_begin() before the write. For
architectures that differentiate between read and write accesses, like
PowerPC, futex_put_value() fails with -EFAULT.

Fix that by using the user_write_access_begin/user_write_access_end() pair
instead.

Fixes: cec199c5e39b ("futex: Implement FUTEX2_NUMA")
Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/all/20250811141147.322261-1-longman@redhat.com