NothingOSS/android_kernel_msm-6.1_nothing_sm7635
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UPSTREAM: mm: add FAULT_FLAG_VMA_LOCK flag

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Add a new flag to distinguish page faults handled under protection of
per-vma lock.

[surenb@google.com: document FAULT_FLAG_VMA_LOCK flag]
  Link: https://lkml.kernel.org/r/20230301022720.1380780-2-surenb@google.com
  Link: https://lore.kernel.org/all/20230301113648.7c279865@canb.auug.org.au/
Link: https://lkml.kernel.org/r/20230227173632.3292573-26-surenb@google.com
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Reviewed-by: Laurent Dufour <laurent.dufour@fr.ibm.com>
Cc: Dan Carpenter <error27@gmail.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Yu Zhao <yuzhao@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

(cherry picked from commit 55324e46eb8b886ecd08c9a089d3a694c705b3b0)

Bug: 161210518
Change-Id: I53d01a529e75307dd613654732eadb46cf17f1e2
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
This commit is contained in:
Suren Baghdasaryan 2023-02-27 09:36:24 -08:00 • committed by Carlos Llamas
parent c06661eab5
commit 318bf22529
2 changed files with 4 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

3
include/linux/mm.h
View file

@ -474,7 +474,8 @@ static inline bool fault_flag_allow_retry_first(enum fault_flag flags)
{ FAULT_FLAG_USER, "USER" }, \
{ FAULT_FLAG_REMOTE, "REMOTE" }, \
{ FAULT_FLAG_INSTRUCTION, "INSTRUCTION" }, \
{ FAULT_FLAG_INTERRUPTIBLE, "INTERRUPTIBLE" }
{ FAULT_FLAG_INTERRUPTIBLE, "INTERRUPTIBLE" }, \
{ FAULT_FLAG_VMA_LOCK, "VMA_LOCK" }
/*
* vm_fault is filled by the pagefault handler and passed to the vma's

2
include/linux/mm_types.h
View file

@ -997,6 +997,7 @@ typedef struct {
* mapped R/O.
* @FAULT_FLAG_ORIG_PTE_VALID: whether the fault has vmf->orig_pte cached.
* We should only access orig_pte if this flag set.
* @FAULT_FLAG_VMA_LOCK: The fault is handled under VMA lock.
*
* About @FAULT_FLAG_ALLOW_RETRY and @FAULT_FLAG_TRIED: we can specify
* whether we would allow page faults to retry by specifying these two
@ -1034,6 +1035,7 @@ enum fault_flag {
FAULT_FLAG_INTERRUPTIBLE = 1 << 9,
FAULT_FLAG_UNSHARE = 1 << 10,
FAULT_FLAG_ORIG_PTE_VALID = 1 << 11,
FAULT_FLAG_VMA_LOCK = 1 << 12,
};
typedef unsigned int __bitwise zap_flags_t;