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BACKPORT: FROMLIST: mm: add FAULT_FLAG_SPECULATIVE flag

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Define the new FAULT_FLAG_SPECULATIVE flag, which indicates when we are
attempting speculative fault handling (without holding the mmap lock).

Signed-off-by: Michel Lespinasse <michel@lespinasse.org>

Conflicts:
    include/linux/mm_types.h

1. Merge conflict due to enum fault_flag being defined in mm.h instead of
mm_types.h

Link: https://lore.kernel.org/all/20220128131006.67712-9-michel@lespinasse.org/
Bug: 161210518
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Change-Id: I48ab427dfa4d7bdbe9932588bec7ae99e9e80ae9
This commit is contained in:
Michel Lespinasse
2022-01-24 17:43:54 -08:00
committed by Todd Kjos
parent f4108b362f
commit f2fa9aae2e
1 changed files with 4 additions and 1 deletions
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5
include/linux/mm.h
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@@ -446,6 +446,7 @@ extern pgprot_t protection_map[16];
* @FAULT_FLAG_REMOTE: The fault is not for current task/mm.
* @FAULT_FLAG_INSTRUCTION: The fault was during an instruction fetch.
* @FAULT_FLAG_INTERRUPTIBLE: The fault can be interrupted by non-fatal signals.
* @FAULT_FLAG_SPECULATIVE: The fault is handled without holding the mmap 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
@@ -477,6 +478,7 @@ enum fault_flag {
FAULT_FLAG_REMOTE = 1 << 7,
FAULT_FLAG_INSTRUCTION = 1 << 8,
FAULT_FLAG_INTERRUPTIBLE = 1 << 9,
FAULT_FLAG_SPECULATIVE = 1 << 10,
};
/*
@@ -516,7 +518,8 @@ 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_SPECULATIVE, "SPECULATIVE" }
/*
* vm_fault is filled by the pagefault handler and passed to the vma's