On Wed, Sep 25, 2024 at 09:06:12PM +0000, Arnd Bergmann wrote: > From: Arnd Bergmann <arnd@xxxxxxxx> > > powerpc and sparc include asm-generic/mman-common.h to get the MAP_* flags > 0x008000 through 0x4000000, but those flags are all different on alpha, > mips, parisc and xtensa. > > Add duplicate definitions for these along with the MAP_* flags for 0x100 > through 0x4000 that are already different on powerpc and sparc, as a > preparation for actually sharing mman-common.h with all architectures. > > Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx> > --- > arch/powerpc/include/uapi/asm/mman.h | 16 ++++++++++++++++ > arch/sparc/include/uapi/asm/mman.h | 15 +++++++++++++++ > include/uapi/asm-generic/mman-common.h | 16 ---------------- > include/uapi/asm-generic/mman.h | 21 +++++++++++++++++++++ > include/uapi/linux/mman.h | 5 +++++ > 5 files changed, 57 insertions(+), 16 deletions(-) > > diff --git a/arch/powerpc/include/uapi/asm/mman.h b/arch/powerpc/include/uapi/asm/mman.h > index c0c737215b00..d57b347c37fe 100644 > --- a/arch/powerpc/include/uapi/asm/mman.h > +++ b/arch/powerpc/include/uapi/asm/mman.h > @@ -13,6 +13,11 @@ > > #define PROT_SAO 0x10 /* Strong Access Ordering */ > > +/* 0x01 - 0x03 are defined in linux/mman.h */ > +#define MAP_TYPE 0x0f /* Mask for type of mapping */ > +#define MAP_FIXED 0x10 /* Interpret addr exactly */ > +#define MAP_ANONYMOUS 0x20 /* don't use a file */ > + > #define MAP_RENAME MAP_ANONYMOUS /* In SunOS terminology */ > #define MAP_NORESERVE 0x40 /* don't reserve swap pages */ > #define MAP_LOCKED 0x80 > @@ -21,6 +26,17 @@ > #define MAP_DENYWRITE 0x0800 /* ETXTBSY */ > #define MAP_EXECUTABLE 0x1000 /* mark it as an executable */ > > +#define MAP_POPULATE 0x008000 /* populate (prefault) pagetables */ > +#define MAP_NONBLOCK 0x010000 /* do not block on IO */ > +#define MAP_STACK 0x020000 /* give out an address that is best suited for process/thread stacks */ > +#define MAP_HUGETLB 0x040000 /* create a huge page mapping */ > +#define MAP_SYNC 0x080000 /* perform synchronous page faults for the mapping */ > +#define MAP_FIXED_NOREPLACE 0x100000 /* MAP_FIXED which doesn't unmap underlying mapping */ > + > +#define MAP_UNINITIALIZED 0x4000000 /* For anonymous mmap, memory could be > + * uninitialized */ > + > + > > #define MCL_CURRENT 0x2000 /* lock all currently mapped pages */ > #define MCL_FUTURE 0x4000 /* lock all additions to address space */ > diff --git a/arch/sparc/include/uapi/asm/mman.h b/arch/sparc/include/uapi/asm/mman.h > index cec9f4109687..afb86698cdb1 100644 > --- a/arch/sparc/include/uapi/asm/mman.h > +++ b/arch/sparc/include/uapi/asm/mman.h > @@ -8,6 +8,11 @@ > > #define PROT_ADI 0x10 /* ADI enabled */ > > +/* 0x01 - 0x03 are defined in linux/mman.h */ > +#define MAP_TYPE 0x0f /* Mask for type of mapping */ > +#define MAP_FIXED 0x10 /* Interpret addr exactly */ > +#define MAP_ANONYMOUS 0x20 /* don't use a file */ > + > #define MAP_RENAME MAP_ANONYMOUS /* In SunOS terminology */ > #define MAP_NORESERVE 0x40 /* don't reserve swap pages */ > #define MAP_INHERIT 0x80 /* SunOS doesn't do this, but... */ > @@ -18,6 +23,16 @@ > #define MAP_DENYWRITE 0x0800 /* ETXTBSY */ > #define MAP_EXECUTABLE 0x1000 /* mark it as an executable */ > > +#define MAP_POPULATE 0x008000 /* populate (prefault) pagetables */ > +#define MAP_NONBLOCK 0x010000 /* do not block on IO */ > +#define MAP_STACK 0x020000 /* give out an address that is best suited for process/thread stacks */ > +#define MAP_HUGETLB 0x040000 /* create a huge page mapping */ > +#define MAP_SYNC 0x080000 /* perform synchronous page faults for the mapping */ > +#define MAP_FIXED_NOREPLACE 0x100000 /* MAP_FIXED which doesn't unmap underlying mapping */ > + > +#define MAP_UNINITIALIZED 0x4000000 /* For anonymous mmap, memory could be > + * uninitialized */ > + > #define MCL_CURRENT 0x2000 /* lock all currently mapped pages */ > #define MCL_FUTURE 0x4000 /* lock all additions to address space */ > #define MCL_ONFAULT 0x8000 /* lock all pages that are faulted in */ > diff --git a/include/uapi/asm-generic/mman-common.h b/include/uapi/asm-generic/mman-common.h > index 792ad5599d9c..8d66d2dabaa8 100644 > --- a/include/uapi/asm-generic/mman-common.h > +++ b/include/uapi/asm-generic/mman-common.h > @@ -17,22 +17,6 @@ > #define PROT_GROWSDOWN 0x01000000 /* mprotect flag: extend change to start of growsdown vma */ > #define PROT_GROWSUP 0x02000000 /* mprotect flag: extend change to end of growsup vma */ > > -/* 0x01 - 0x03 are defined in linux/mman.h */ > -#define MAP_TYPE 0x0f /* Mask for type of mapping */ > -#define MAP_FIXED 0x10 /* Interpret addr exactly */ > -#define MAP_ANONYMOUS 0x20 /* don't use a file */ > - Hm, maybe I'm missing something, but why are we duplicating these? > -/* 0x0100 - 0x4000 flags are defined in asm-generic/mman.h */ > -#define MAP_POPULATE 0x008000 /* populate (prefault) pagetables */ > -#define MAP_NONBLOCK 0x010000 /* do not block on IO */ > -#define MAP_STACK 0x020000 /* give out an address that is best suited for process/thread stacks */ > -#define MAP_HUGETLB 0x040000 /* create a huge page mapping */ > -#define MAP_SYNC 0x080000 /* perform synchronous page faults for the mapping */ > -#define MAP_FIXED_NOREPLACE 0x100000 /* MAP_FIXED which doesn't unmap underlying mapping */ > - > -#define MAP_UNINITIALIZED 0x4000000 /* For anonymous mmap, memory could be > - * uninitialized */ > - > /* > * Flags for mlock > */ > diff --git a/include/uapi/asm-generic/mman.h b/include/uapi/asm-generic/mman.h > index 57e8195d0b53..f26f9b4c03e1 100644 > --- a/include/uapi/asm-generic/mman.h > +++ b/include/uapi/asm-generic/mman.h > @@ -4,12 +4,33 @@ > > #include <asm-generic/mman-common.h> > > +/* > + * 0x01 - 0x03 are defined in linux/mman.h > + * 0x04 - 0x200000 are architecture specific > + * 0x200000 - 0x2000000 are available for common assignments in linux/mman.h > + * 0x4000000 - 0x80000000 are used for hugepage encodings > + */ > +#define MAP_TYPE 0x0f /* Mask for type of mapping */ > +#define MAP_FIXED 0x10 /* Interpret addr exactly */ > +#define MAP_ANONYMOUS 0x20 /* don't use a file */ > + > #define MAP_GROWSDOWN 0x0100 /* stack-like segment */ > #define MAP_DENYWRITE 0x0800 /* ETXTBSY */ > #define MAP_EXECUTABLE 0x1000 /* mark it as an executable */ > #define MAP_LOCKED 0x2000 /* pages are locked */ > #define MAP_NORESERVE 0x4000 /* don't check for reservations */ > > +#define MAP_POPULATE 0x008000 /* populate (prefault) pagetables */ > +#define MAP_NONBLOCK 0x010000 /* do not block on IO */ > +#define MAP_STACK 0x020000 /* give out an address that is best suited for process/thread stacks */ > +#define MAP_HUGETLB 0x040000 /* create a huge page mapping */ > +#define MAP_SYNC 0x080000 /* perform synchronous page faults for the mapping */ > +#define MAP_FIXED_NOREPLACE 0x100000 /* MAP_FIXED which doesn't unmap underlying mapping */ > + > +#define MAP_UNINITIALIZED 0x4000000 /* For anonymous mmap, memory could be > + * uninitialized */ > + > + > /* > * Bits [26:31] are reserved, see asm-generic/hugetlb_encode.h > * for MAP_HUGETLB usage > diff --git a/include/uapi/linux/mman.h b/include/uapi/linux/mman.h > index e89d00528f2f..b70cb06dd7ef 100644 > --- a/include/uapi/linux/mman.h > +++ b/include/uapi/linux/mman.h > @@ -18,6 +18,11 @@ > #define MAP_PRIVATE 0x02 /* Changes are private */ > #define MAP_SHARED_VALIDATE 0x03 /* share + validate extension flags */ > #define MAP_DROPPABLE 0x08 /* Zero memory under memory pressure. */ > +/* > + * 0x10 through 0x200000 are used for architecture specific definitions > + * in asm/mman.h, numbers 0x400000 through 0x2000000 are currently > + * available on all architectures. > + */ Nice to add this documentation! > > /* > * Huge page size encoding when MAP_HUGETLB is specified, and a huge page > -- > 2.39.2 >
