Introduce sparc32 arch_mmap_hint() and define HAVE_ARCH_MMAP_HINT.
If a sufficiently sized hole doesn't exist at the hint address,
fallback to searching the entire valid VA space instead of only
the VA space above the hint address.
Signed-off-by: Kalesh Singh <kaleshsi...@google.com>
---
Changes in v2:
- MAP_FIXED case is also handled in arch_mmap_hint() since this is just a
special case of the hint addr being "enforced", per Yang Shi.
- Consolidate error handling in arch_mmap_hint().
arch/sparc/include/asm/pgtable_32.h | 1 +
arch/sparc/kernel/sys_sparc_32.c | 33 +++++++++++++++++++----------
2 files changed, 23 insertions(+), 11 deletions(-)
diff --git a/arch/sparc/include/asm/pgtable_32.h
b/arch/sparc/include/asm/pgtable_32.h
index 62bcafe38b1f..95084c4d0b01 100644
--- a/arch/sparc/include/asm/pgtable_32.h
+++ b/arch/sparc/include/asm/pgtable_32.h
@@ -437,6 +437,7 @@ static inline int io_remap_pfn_range(struct vm_area_struct
*vma,
/* We provide our own get_unmapped_area to cope with VA holes for userland */
#define HAVE_ARCH_UNMAPPED_AREA
+#define HAVE_ARCH_MMAP_HINT
#define pmd_pgtable(pmd) ((pgtable_t)__pmd_page(pmd))
diff --git a/arch/sparc/kernel/sys_sparc_32.c b/arch/sparc/kernel/sys_sparc_32.c
index fb31bc0c5b48..0cc717755417 100644
--- a/arch/sparc/kernel/sys_sparc_32.c
+++ b/arch/sparc/kernel/sys_sparc_32.c
@@ -40,13 +40,17 @@ SYSCALL_DEFINE0(getpagesize)
return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */
}
-unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
unsigned long len, unsigned long pgoff, unsigned long flags, vm_flags_t
vm_flags)
+unsigned long arch_mmap_hint(struct file *filp, unsigned long addr,
+ unsigned long len, unsigned long pgoff,
+ unsigned long flags)
{
- struct vm_unmapped_area_info info = {};
- bool file_hugepage = false;
+ bool file_hugepage;
+
+ /* See asm-sparc/uaccess.h */
+ if (len > TASK_SIZE - PAGE_SIZE)
+ return -ENOMEM;
- if (filp && is_file_hugepages(filp))
- file_hugepage = true;
+ file_hugepage = filp && is_file_hugepages(filp);
if (flags & MAP_FIXED) {
/* We do not accept a shared mapping if it would violate
@@ -58,14 +62,21 @@ unsigned long arch_get_unmapped_area(struct file *filp,
unsigned long addr, unsi
return addr;
}
- /* See asm-sparc/uaccess.h */
- if (len > TASK_SIZE - PAGE_SIZE)
- return -ENOMEM;
- if (!addr)
- addr = TASK_UNMAPPED_BASE;
+ 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, unsigned long flags,
vm_flags_t vm_flags)
+{
+ struct vm_unmapped_area_info info = {};
+ bool file_hugepage = false;
+
+ addr = arch_mmap_hint(filp, addr, len, pgoff, flags);
+ if (addr)
+ return addr;
info.length = len;
- info.low_limit = addr;
+ info.low_limit = TASK_UNMAPPED_BASE;
info.high_limit = TASK_SIZE;
if (!file_hugepage) {
info.align_mask = (flags & MAP_SHARED) ?
--
2.47.0.338.g60cca15819-goog
_______________________________________________
linux-snps-arc mailing list
linux-snps-arc@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-snps-arc
