mirror of
https://github.com/Fishwaldo/Star64_linux.git
synced 2025-03-17 20:54:10 +00:00
mm: define default MAX_PTRS_PER_* in include/pgtable.h
Commit c65e774fb3
("x86/mm: Make PGDIR_SHIFT and PTRS_PER_P4D variable")
made PTRS_PER_P4D variable on x86 and introduced MAX_PTRS_PER_P4D as a
constant for cases which need a compile-time constant (e.g. fixed-size
arrays).
powerpc likewise has boot-time selectable MMU features which can cause
other mm "constants" to vary. For KASAN, we have some static
PTE/PMD/PUD/P4D arrays so we need compile-time maximums for all these
constants. Extend the MAX_PTRS_PER_ idiom, and place default definitions
in include/pgtable.h. These define MAX_PTRS_PER_x to be PTRS_PER_x unless
an architecture has defined MAX_PTRS_PER_x in its arch headers.
Clean up pgtable-nop4d.h and s390's MAX_PTRS_PER_P4D definitions while
we're at it: both can just pick up the default now.
Link: https://lkml.kernel.org/r/20210624034050.511391-4-dja@axtens.net
Signed-off-by: Daniel Axtens <dja@axtens.net>
Acked-by: Andrey Konovalov <andreyknvl@gmail.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Marco Elver <elver@google.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
parent
af3751f3c2
commit
c0f8aa4fa8
3 changed files with 22 additions and 3 deletions
|
@ -344,8 +344,6 @@ static inline int is_module_addr(void *addr)
|
|||
#define PTRS_PER_P4D _CRST_ENTRIES
|
||||
#define PTRS_PER_PGD _CRST_ENTRIES
|
||||
|
||||
#define MAX_PTRS_PER_P4D PTRS_PER_P4D
|
||||
|
||||
/*
|
||||
* Segment table and region3 table entry encoding
|
||||
* (R = read-only, I = invalid, y = young bit):
|
||||
|
|
|
@ -9,7 +9,6 @@
|
|||
typedef struct { pgd_t pgd; } p4d_t;
|
||||
|
||||
#define P4D_SHIFT PGDIR_SHIFT
|
||||
#define MAX_PTRS_PER_P4D 1
|
||||
#define PTRS_PER_P4D 1
|
||||
#define P4D_SIZE (1UL << P4D_SHIFT)
|
||||
#define P4D_MASK (~(P4D_SIZE-1))
|
||||
|
|
|
@ -1592,4 +1592,26 @@ typedef unsigned int pgtbl_mod_mask;
|
|||
#define pte_leaf_size(x) PAGE_SIZE
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Some architectures have MMUs that are configurable or selectable at boot
|
||||
* time. These lead to variable PTRS_PER_x. For statically allocated arrays it
|
||||
* helps to have a static maximum value.
|
||||
*/
|
||||
|
||||
#ifndef MAX_PTRS_PER_PTE
|
||||
#define MAX_PTRS_PER_PTE PTRS_PER_PTE
|
||||
#endif
|
||||
|
||||
#ifndef MAX_PTRS_PER_PMD
|
||||
#define MAX_PTRS_PER_PMD PTRS_PER_PMD
|
||||
#endif
|
||||
|
||||
#ifndef MAX_PTRS_PER_PUD
|
||||
#define MAX_PTRS_PER_PUD PTRS_PER_PUD
|
||||
#endif
|
||||
|
||||
#ifndef MAX_PTRS_PER_P4D
|
||||
#define MAX_PTRS_PER_P4D PTRS_PER_P4D
|
||||
#endif
|
||||
|
||||
#endif /* _LINUX_PGTABLE_H */
|
||||
|
|
Loading…
Add table
Reference in a new issue