Commit 820fe456 authored Jun 07, 2023 by Jens Axboe Committed by Li Lingfeng Jun 07, 2023

arch: ensure parisc/powerpc handle PF_IO_WORKER in copy_thread()

stable inclusion
from stable-v5.10.162
commit dd26e2cec74f88cb7910deec77897d04ade299bd
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I6LQMS

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=dd26e2cec74f88cb7910deec77897d04ade299bd



--------------------------------

[ Upstream commit 0100e6bb ]

In the arch addition of PF_IO_WORKER, I missed parisc and powerpc for
some reason. Fix that up, ensuring they handle PF_IO_WORKER like they do
PF_KTHREAD in copy_thread().

Reported-by: Bruno Goncalves <bgoncalv@redhat.com>
Fixes: 4727dc20 ("arch: setup PF_IO_WORKER threads like PF_KTHREAD")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Li Lingfeng <lilingfeng3@huawei.com>

parent 5b0c03b1

arch/parisc/kernel/process.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -200,7 +200,7 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
		extern void * const ret_from_kernel_thread;
		extern void * const child_return;

		if (unlikely(p->flags & PF_KTHREAD)) {
		if (unlikely(p->flags & (PF_KTHREAD \| PF_IO_WORKER))) {
		/* kernel thread */
		memset(cregs, 0, sizeof(struct pt_regs));
		if (!usp) /* idle thread */

arch/powerpc/kernel/process.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1684,7 +1684,7 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
		/* Copy registers */
		sp -= sizeof(struct pt_regs);
		childregs = (struct pt_regs *) sp;
		if (unlikely(p->flags & PF_KTHREAD)) {
		if (unlikely(p->flags & (PF_KTHREAD \| PF_IO_WORKER))) {
		/* kernel thread */
		memset(childregs, 0, sizeof(struct pt_regs));
		childregs->gpr[1] = sp + sizeof(struct pt_regs);