Introduce sparc64 arch_mmap_hint() and define HAVE_ARCH_MMAP_HINT.
This is a preparatory patch, no functional change is introduced.
Signed-off-by: Kalesh Singh <kaleshsingh@xxxxxxxxxx>
---
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_64.h | 1 +
arch/sparc/kernel/sys_sparc_64.c | 96 +++++++++++------------------
2 files changed, 37 insertions(+), 60 deletions(-)
diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h
index 2b7f358762c1..f24a4eb2777b 100644
--- a/arch/sparc/include/asm/pgtable_64.h
+++ b/arch/sparc/include/asm/pgtable_64.h
@@ -1148,6 +1148,7 @@ static inline bool pte_access_permitted(pte_t pte, bool write)
*/
#define HAVE_ARCH_UNMAPPED_AREA
#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
+#define HAVE_ARCH_MMAP_HINT
/* We provide a special get_unmapped_area for framebuffer mmaps to try and use
* the largest alignment possible such that larget PTEs can be used.
diff --git a/arch/sparc/kernel/sys_sparc_64.c b/arch/sparc/kernel/sys_sparc_64.c
index c5a284df7b41..e44d55b30a84 100644
--- a/arch/sparc/kernel/sys_sparc_64.c
+++ b/arch/sparc/kernel/sys_sparc_64.c
@@ -98,17 +98,19 @@ static unsigned long get_align_mask(struct file *filp, unsigned long flags)
return 0;
}
-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 mm_struct *mm = current->mm;
- struct vm_area_struct * vma;
- unsigned long task_size = TASK_SIZE;
- int do_color_align;
- struct vm_unmapped_area_info info = {};
- bool file_hugepage = false;
+ unsigned long task_size;
+ bool do_color_align;
+ bool file_hugepage;
- if (filp && is_file_hugepages(filp))
- file_hugepage = true;
+ task_size = test_thread_flag(TIF_32BIT) ? STACK_TOP32 : TASK_SIZE;
+ if (unlikely(len > task_size || len >= VA_EXCLUDE_START))
+ return -ENOMEM;
+
+ file_hugepage = filp && is_file_hugepages(filp);
if (flags & MAP_FIXED) {
/* We do not accept a shared mapping if it would violate
@@ -120,26 +122,29 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsi
return addr;
}
- if (test_thread_flag(TIF_32BIT))
- task_size = STACK_TOP32;
- if (unlikely(len > task_size || len >= VA_EXCLUDE_START))
- return -ENOMEM;
+ do_color_align = (filp || (flags & MAP_SHARED)) && !file_hugepage;
- do_color_align = 0;
- if ((filp || (flags & MAP_SHARED)) && !file_hugepage)
- do_color_align = 1;
+ if (do_color_align)
+ addr = COLOR_ALIGN(addr, pgoff);
+ else
+ addr = PAGE_ALIGN(addr);
- if (addr) {
- if (do_color_align)
- addr = COLOR_ALIGN(addr, pgoff);
- else
- addr = PAGE_ALIGN(addr);
+ return generic_mmap_hint(filp, addr, len, pgoff, flags);
+}
- vma = find_vma(mm, addr);
- if (task_size - len >= addr &&
- (!vma || addr + len <= vm_start_gap(vma)))
- return addr;
- }
+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 = {};
+ unsigned long task_size;
+ bool file_hugepage;
+
+ addr = arch_mmap_hint(filp, addr, len, pgoff, flags);
+ if (addr)
+ return addr;
+
+ task_size = test_thread_flag(TIF_32BIT) ? STACK_TOP32 : TASK_SIZE;
+ file_hugepage = filp && is_file_hugepages(filp);
info.length = len;
info.low_limit = TASK_UNMAPPED_BASE;
@@ -164,49 +169,20 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
const unsigned long len, const unsigned long pgoff,
const unsigned long flags, vm_flags_t vm_flags)
{
- struct vm_area_struct *vma;
struct mm_struct *mm = current->mm;
- unsigned long task_size = STACK_TOP32;
unsigned long addr = addr0;
- int do_color_align;
struct vm_unmapped_area_info info = {};
- bool file_hugepage = false;
+ bool file_hugepage;
/* This should only ever run for 32-bit processes. */
BUG_ON(!test_thread_flag(TIF_32BIT));
- if (filp && is_file_hugepages(filp))
- file_hugepage = true;
-
- if (flags & MAP_FIXED) {
- /* We do not accept a shared mapping if it would violate
- * cache aliasing constraints.
- */
- if (!file_hugepage && (flags & MAP_SHARED) &&
- ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
- return -EINVAL;
- return addr;
- }
-
- if (unlikely(len > task_size))
- return -ENOMEM;
-
- do_color_align = 0;
- if ((filp || (flags & MAP_SHARED)) && !file_hugepage)
- do_color_align = 1;
-
/* requesting a specific address */
- if (addr) {
- if (do_color_align)
- addr = COLOR_ALIGN(addr, pgoff);
- else
- addr = PAGE_ALIGN(addr);
+ addr = arch_mmap_hint(filp, addr, len, pgoff, flags);
+ if (addr)
+ return addr;
- vma = find_vma(mm, addr);
- if (task_size - len >= addr &&
- (!vma || addr + len <= vm_start_gap(vma)))
- return addr;
- }
+ file_hugepage = filp && is_file_hugepages(filp);
info.flags = VM_UNMAPPED_AREA_TOPDOWN;
info.length = len;
--
2.47.0.338.g60cca15819-goog
