Revision e700898fa075c69b3ae02b702ab57fb75e1a82ec authored by Mike Kravetz on 12 December 2022, 23:50:41 UTC, committed by Andrew Morton on 21 December 2022, 22:31:52 UTC
Commit bbff39cc6cbc ("hugetlb: allocate vma lock for all sharable vmas") removed the pmd sharable checks in the vma lock helper routines. However, it left the functional version of helper routines behind #ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE. Therefore, the vma lock is not being used for sharable vmas on architectures that do not support pmd sharing. On these architectures, a potential fault/truncation race is exposed that could leave pages in a hugetlb file past i_size until the file is removed. Move the functional vma lock helpers outside the ifdef, and remove the non-functional stubs. Since the vma lock is not just for pmd sharing, rename the routine __vma_shareable_flags_pmd. Link: https://lkml.kernel.org/r/20221212235042.178355-1-mike.kravetz@oracle.com Fixes: bbff39cc6cbc ("hugetlb: allocate vma lock for all sharable vmas") Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com> Reviewed-by: Miaohe Lin <linmiaohe@huawei.com> Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> Cc: David Hildenbrand <david@redhat.com> Cc: James Houghton <jthoughton@google.com> Cc: Mina Almasry <almasrymina@google.com> Cc: Muchun Song <songmuchun@bytedance.com> Cc: Naoya Horiguchi <naoya.horiguchi@linux.dev> Cc: Peter Xu <peterx@redhat.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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serial.h
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Generic serial GNSS receiver driver
*
* Copyright (C) 2018 Johan Hovold <johan@kernel.org>
*/
#ifndef _LINUX_GNSS_SERIAL_H
#define _LINUX_GNSS_SERIAL_H
#include <asm/termbits.h>
#include <linux/pm.h>
struct gnss_serial {
struct serdev_device *serdev;
struct gnss_device *gdev;
speed_t speed;
const struct gnss_serial_ops *ops;
unsigned long drvdata[];
};
enum gnss_serial_pm_state {
GNSS_SERIAL_OFF,
GNSS_SERIAL_ACTIVE,
GNSS_SERIAL_STANDBY,
};
struct gnss_serial_ops {
int (*set_power)(struct gnss_serial *gserial,
enum gnss_serial_pm_state state);
};
extern const struct dev_pm_ops gnss_serial_pm_ops;
struct gnss_serial *gnss_serial_allocate(struct serdev_device *gserial,
size_t data_size);
void gnss_serial_free(struct gnss_serial *gserial);
int gnss_serial_register(struct gnss_serial *gserial);
void gnss_serial_deregister(struct gnss_serial *gserial);
static inline void *gnss_serial_get_drvdata(struct gnss_serial *gserial)
{
return gserial->drvdata;
}
#endif /* _LINUX_GNSS_SERIAL_H */
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