Introduce alpha arch_mmap_hint() and define HAVE_ARCH_MMAP_HINT.
This is a preparatory patch, no functional change is introduced.
Signed-off-by: Kalesh Singh <kaleshsi...@google.com>
---
arch/alpha/include/asm/pgtable.h | 1 +
arch/alpha/kernel/osf_sys.c | 29 ++++++++++++++++++++++++-----
2 files changed, 25 insertions(+), 5 deletions(-)
diff --git a/arch/alpha/include/asm/pgtable.h b/arch/alpha/include/asm/pgtable.h
index 635f0a5f5bbd..372885a01abd 100644
--- a/arch/alpha/include/asm/pgtable.h
+++ b/arch/alpha/include/asm/pgtable.h
@@ -362,5 +362,6 @@ extern void paging_init(void);
/* We have our own get_unmapped_area to cope with ADDR_LIMIT_32BIT. */
#define HAVE_ARCH_UNMAPPED_AREA
+#define HAVE_ARCH_MMAP_HINT
#endif /* _ALPHA_PGTABLE_H */
diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c
index 86185021f75a..68e61dece537 100644
--- a/arch/alpha/kernel/osf_sys.c
+++ b/arch/alpha/kernel/osf_sys.c
@@ -1225,6 +1225,27 @@ arch_get_unmapped_area_1(unsigned long addr, unsigned
long len,
return vm_unmapped_area(&info);
}
+unsigned long arch_mmap_hint(struct file *filp, unsigned long addr,
+ unsigned long len, unsigned long pgoff,
+ unsigned long flags)
+{
+ unsigned long limit;
+
+ if (!addr)
+ return 0;
+
+ /* "32 bit" actually means 31 bit, since pointers sign extend. */
+ if (current->personality & ADDR_LIMIT_32BIT)
+ limit = 0x80000000;
+ else
+ limit = TASK_SIZE;
+
+ if (limit - len < addr)
+ return 0;
+
+ return generic_mmap_hint(filp, addr, len, pgoff, flags);
+}
+
unsigned long
arch_get_unmapped_area(struct file *filp, unsigned long addr,
unsigned long len, unsigned long pgoff,
@@ -1254,11 +1275,9 @@ arch_get_unmapped_area(struct file *filp, unsigned long
addr,
merely specific addresses, but regions of memory -- perhaps
this feature should be incorporated into all ports? */
- if (addr) {
- addr = arch_get_unmapped_area_1 (PAGE_ALIGN(addr), len, limit);
- if (addr != (unsigned long) -ENOMEM)
- return addr;
- }
+ addr = arch_mmap_hint(filp, addr, len, pgoff, flags);
+ if (addr)
+ return hint;
/* Next, try allocating at TASK_UNMAPPED_BASE. */
addr = arch_get_unmapped_area_1 (PAGE_ALIGN(TASK_UNMAPPED_BASE),
--
2.47.0.338.g60cca15819-goog
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