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Linux 5.9-rc1

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Merge 5.9-rc1 into android-mainline

Linux 5.9-rc1

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I1cfd3565631a1fa0d0411d93d4131ed92ec4ff23
This commit is contained in:
Greg Kroah-Hartman 2020-08-17 10:41:31 +02:00
commit 2a3286f860
6 changed files with 417 additions and 158 deletions
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4
Makefile
View File

@ -1,8 +1,8 @@
# SPDX-License-Identifier: GPL-2.0
VERSION = 5
PATCHLEVEL = 8
PATCHLEVEL = 9
SUBLEVEL = 0
EXTRAVERSION =
EXTRAVERSION = -rc1
NAME = Kleptomaniac Octopus
# *DOCUMENTATION*

6
arch/parisc/include/asm/pgalloc.h
View File

@ -10,6 +10,7 @@
#include <asm/cache.h>
#define __HAVE_ARCH_PMD_ALLOC_ONE
#define __HAVE_ARCH_PMD_FREE
#define __HAVE_ARCH_PGD_FREE
#include <asm-generic/pgalloc.h>
@ -67,6 +68,11 @@ static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
(__u32)(__pa((unsigned long)pmd) >> PxD_VALUE_SHIFT)));
}
static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
{
return (pmd_t *)__get_free_pages(GFP_PGTABLE_KERNEL, PMD_ORDER);
}
static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
{
if (pmd_flag(*pmd) & PxD_FLAG_ATTACHED) {

539
fs/io_uring.c
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File diff suppressed because it is too large Load Diff

2
include/linux/fs.h
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@ -3346,7 +3346,7 @@ static inline int kiocb_set_rw_flags(struct kiocb *ki, rwf_t flags)
if (flags & RWF_NOWAIT) {
if (!(ki->ki_filp->f_mode & FMODE_NOWAIT))
return -EOPNOTSUPP;
kiocb_flags |= IOCB_NOWAIT;
kiocb_flags |= IOCB_NOWAIT | IOCB_NOIO;
}
if (flags & RWF_HIPRI)
kiocb_flags |= IOCB_HIPRI;

16
kernel/signal.c
View File

@ -2542,7 +2542,21 @@ bool get_signal(struct ksignal *ksig)
relock:
spin_lock_irq(&sighand->siglock);
current->jobctl &= ~JOBCTL_TASK_WORK;
/*
* Make sure we can safely read ->jobctl() in task_work add. As Oleg
* states:
*
* It pairs with mb (implied by cmpxchg) before READ_ONCE. So we
* roughly have
*
* task_work_add: get_signal:
* STORE(task->task_works, new_work); STORE(task->jobctl);
* mb(); mb();
* LOAD(task->jobctl); LOAD(task->task_works);
*
* and we can rely on STORE-MB-LOAD [ in task_work_add].
*/
smp_store_mb(current->jobctl, current->jobctl & ~JOBCTL_TASK_WORK);
if (unlikely(current->task_works)) {
spin_unlock_irq(&sighand->siglock);
task_work_run();

8
kernel/task_work.c
View File

@ -42,7 +42,13 @@ task_work_add(struct task_struct *task, struct callback_head *work, int notify)
set_notify_resume(task);
break;
case TWA_SIGNAL:
if (lock_task_sighand(task, &flags)) {
/*
* Only grab the sighand lock if we don't already have some
* task_work pending. This pairs with the smp_store_mb()
* in get_signal(), see comment there.
*/
if (!(READ_ONCE(task->jobctl) & JOBCTL_TASK_WORK) &&
lock_task_sighand(task, &flags)) {
task->jobctl |= JOBCTL_TASK_WORK;
signal_wake_up(task, 0);
unlock_task_sighand(task, &flags);