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(parent: b0d3115) | patch
s390: use WRITE_ONCE when re-allocating async stack
authorSven Schnelle <svens@linux.ibm.com>
Wed, 10 Feb 2021 12:39:19 +0000 (13:39 +0100)
committerVasily Gorbik <gor@linux.ibm.com>
Sat, 13 Feb 2021 16:17:53 +0000 (17:17 +0100)
commit64985c3a223d15f151204b3aa37e587b9466378d
treed69076d3eb1e09285a65f1f1454519b1b5bd8f96tree | snapshot
parentb0d31159a46787380353426faaad8febc9bef009commit | diff
s390: use WRITE_ONCE when re-allocating async stack

The code does:

S390_lowcore.async_stack = new + STACK_INIT_OFFSET;

But the compiler is free to first assign one value and
add the other value later. If a IRQ would be coming in
between these two operations, it would run with an invalid
stack. Prevent this by using WRITE_ONCE.

Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
arch/s390/kernel/setup.c diff | blob | blame | history
Linux 6.x block layer and io_uring tree(s)