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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 
hugetlb: really allocate vma lock for all sharable vmas
 
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>
1 parent 7ba594d
Raw File
mux.h 
/* SPDX-License-Identifier: GPL-2.0 */

#ifndef __USB_TYPEC_MUX__
#define __USB_TYPEC_MUX__

#include <linux/usb/typec_mux.h>

struct typec_switch_dev {
	struct device dev;
	typec_switch_set_fn_t set;
};

struct typec_mux_dev {
	struct device dev;
	typec_mux_set_fn_t set;
};

#define to_typec_switch_dev(_dev_) container_of(_dev_, struct typec_switch_dev, dev)
#define to_typec_mux_dev(_dev_) container_of(_dev_, struct typec_mux_dev, dev)

extern const struct device_type typec_switch_dev_type;
extern const struct device_type typec_mux_dev_type;

#define is_typec_switch_dev(dev) ((dev)->type == &typec_switch_dev_type)
#define is_typec_mux_dev(dev) ((dev)->type == &typec_mux_dev_type)

#endif /* __USB_TYPEC_MUX__ */
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