| Message ID | 20210430195232.30491-9-michel@lespinasse.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [01/29] mm: export dump_mm | expand |
On Fri, Apr 30, 2021 at 12:52 PM Michel Lespinasse <michel@lespinasse.org> wrote: > > 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> > --- > include/linux/mm.h | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/include/linux/mm.h b/include/linux/mm.h > index 8ba434287387..021fdab5b721 100644 > --- a/include/linux/mm.h > +++ b/include/linux/mm.h > @@ -434,6 +434,7 @@ 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_sem. nit: s/mmap_sem/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 > @@ -464,6 +465,7 @@ extern pgprot_t protection_map[16]; > #define FAULT_FLAG_REMOTE 0x80 > #define FAULT_FLAG_INSTRUCTION 0x100 > #define FAULT_FLAG_INTERRUPTIBLE 0x200 > +#define FAULT_FLAG_SPECULATIVE 0x400 > > /* > * The default fault flags that should be used by most of the > @@ -501,7 +503,8 @@ static inline bool fault_flag_allow_retry_first(unsigned int 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 > -- > 2.20.1 >
diff --git a/include/linux/mm.h b/include/linux/mm.h index 8ba434287387..021fdab5b721 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -434,6 +434,7 @@ 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_sem. * * About @FAULT_FLAG_ALLOW_RETRY and @FAULT_FLAG_TRIED: we can specify * whether we would allow page faults to retry by specifying these two @@ -464,6 +465,7 @@ extern pgprot_t protection_map[16]; #define FAULT_FLAG_REMOTE 0x80 #define FAULT_FLAG_INSTRUCTION 0x100 #define FAULT_FLAG_INTERRUPTIBLE 0x200 +#define FAULT_FLAG_SPECULATIVE 0x400 /* * The default fault flags that should be used by most of the @@ -501,7 +503,8 @@ static inline bool fault_flag_allow_retry_first(unsigned int 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
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> --- include/linux/mm.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)