[PATCH v4 02/14] mm: Switch mm->get_unmapped_area() to a flag

Rick Edgecombe
2024-03-26T02:17:17Z

The mm_struct contains a function pointer *get_unmapped_area(), which
is set to either arch_get_unmapped_area() or
arch_get_unmapped_area_topdown() during the initialization of the mm.

Since the function pointer only ever points to two functions that are named
the same across all arch's, a function pointer is not really required. In
addition future changes will want to add versions of the functions that
take additional arguments. So to save a pointers worth of bytes in
mm_struct, and prevent adding additional function pointers to mm_struct in
future changes, remove it and keep the information about which
get_unmapped_area() to use in a flag.

Add the new flag to MMF_INIT_MASK so it doesn't get clobbered on fork by
mmf_init_flags(). Most MM flags get clobbered on fork. In the pre-existing
behavior mm->get_unmapped_area() would get copied to the new mm in
dup_mm(), so not clobbering the flag preserves the existing behavior
around inheriting the topdown-ness.

Introduce a helper, mm_get_unmapped_area(), to easily convert code that
refers to the old function pointer to instead select and call either
arch_get_unmapped_area() or arch_get_unmapped_area_topdown() based on the
flag. Then drop the mm->get_unmapped_area() function pointer. Leave the
get_unmapped_area() pointer in struct file_operations alone. The main
purpose of this change is to reorganize in preparation for future changes,
but it also converts the calls of mm->get_unmapped_area() from indirect
branches into a direct ones.

The stress-ng bigheap benchmark calls realloc a lot, which calls through
get_unmapped_area() in the kernel. On x86, the change yielded a ~1%
improvement there on a retpoline config.

In testing a few x86 configs, removing the pointer unfortunately didn't
result in any actual size reductions in the compiled layout of mm_struct.
But depending on compiler or arch alignment requirements, the change could
shrink the size of mm_struct.

Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Reviewed-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: linux-s390@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: sparclinux@vger.kernel.org
Cc: linux-sgx@vger.kernel.org
Cc: nvdimm@lists.linux.dev
Cc: linux-cxl@vger.kernel.org
Cc: linux-mm@kvack.org
Cc: linux-fsdevel@vger.kernel.org
Cc: io-uring@vger.kernel.org
Cc: bpf@vger.kernel.org
---
v4:
- Split out pde_get_unmapped_area() refactor into separate patch
(Christophe Leroy)

v3:
- Fix comment that still referred to mm->get_unmapped_area()
- Resolve trivial rebase conflicts with "mm: thp_get_unmapped_area must
honour topdown preference"
- Spelling fix in log

v2:
- Fix comment on MMF_TOPDOWN (Kirill, rppt)
- Move MMF_TOPDOWN to actually unused bit
- Add MMF_TOPDOWN to MMF_INIT_MASK so it doesn't get clobbered on fork,
and result in the children using the search up path.
- New lower performance results after above bug fix
- Add Reviews and Acks
---
arch/s390/mm/hugetlbpage.c | 2 +-
arch/s390/mm/mmap.c | 4 ++--
arch/sparc/kernel/sys_sparc_64.c | 15 ++++++---------
arch/sparc/mm/hugetlbpage.c | 2 +-
arch/x86/kernel/cpu/sgx/driver.c | 2 +-
arch/x86/mm/hugetlbpage.c | 2 +-
arch/x86/mm/mmap.c | 4 ++--
drivers/char/mem.c | 2 +-
drivers/dax/device.c | 6 +++---
fs/hugetlbfs/inode.c | 4 ++--
fs/proc/inode.c | 3 ++-
fs/ramfs/file-mmu.c | 2 +-
include/linux/mm_types.h | 6 +-----
include/linux/sched/coredump.h | 5 ++++-
include/linux/sched/mm.h | 5 +++++
io_uring/io_uring.c | 2 +-
kernel/bpf/arena.c | 2 +-
kernel/bpf/syscall.c | 2 +-
mm/debug.c | 6 ------
mm/huge_memory.c | 9 ++++-----
mm/mmap.c | 21 ++++++++++++++++++---
mm/shmem.c | 11 +++++------
mm/util.c | 6 +++---
23 files changed, 66 insertions(+), 57 deletions(-)

diff --git a/arch/s390/mm/hugetlbpage.c b/arch/s390/mm/hugetlbpage.c
index c2e8242bd15d..219d906fe830 100644
--- a/arch/s390/mm/hugetlbpage.c
+++ b/arch/s390/mm/hugetlbpage.c
@@ -328,7 +328,7 @@ unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
goto check_asce_limit;
}

- if (mm->get_unmapped_area == arch_get_unmapped_area)
+ if (!test_bit(MMF_TOPDOWN, &mm->flags))
addr = hugetlb_get_unmapped_area_bottomup(file, addr, len,
pgoff, flags);
else
diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c
index b14fc0887654..6b2e4436ad4a 100644
--- a/arch/s390/mm/mmap.c
+++ b/arch/s390/mm/mmap.c
@@ -185,10 +185,10 @@ void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
*/
if (mmap_is_legacy(rlim_stack)) {
mm->mmap_base = mmap_base_legacy(random_factor);
- mm->get_unmapped_area = arch_get_unmapped_area;
+ clear_bit(MMF_TOPDOWN, &mm->flags);
} else {
mm->mmap_base = mmap_base(random_factor, rlim_stack);
- mm->get_unmapped_area = arch_get_unmapped_area_topdown;
+ set_bit(MMF_TOPDOWN, &mm->flags);
}
}

diff --git a/arch/sparc/kernel/sys_sparc_64.c b/arch/sparc/kernel/sys_sparc_64.c
index 1e9a9e016237..1dbf7211666e 100644
--- a/arch/sparc/kernel/sys_sparc_64.c
+++ b/arch/sparc/kernel/sys_sparc_64.c
@@ -218,14 +218,10 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
{
unsigned long align_goal, addr = -ENOMEM;
- unsigned long (*get_area)(struct file *, unsigned long,
- unsigned long, unsigned long, unsigned long);
-
- get_area = current->mm->get_unmapped_area;

if (flags & MAP_FIXED) {
/* Ok, don't mess with it. */
- return get_area(NULL, orig_addr, len, pgoff, flags);
+ return mm_get_unmapped_area(current->mm, NULL, orig_addr, len, pgoff, flags);
}
flags &= ~MAP_SHARED;

@@ -238,7 +234,8 @@ unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, u
align_goal = (64UL * 1024);

do {
- addr = get_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
+ addr = mm_get_unmapped_area(current->mm, NULL, orig_addr,
+ len + (align_goal - PAGE_SIZE), pgoff, flags);
if (!(addr & ~PAGE_MASK)) {
addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
break;
@@ -256,7 +253,7 @@ unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, u
* be obtained.
*/
if (addr & ~PAGE_MASK)
- addr = get_area(NULL, orig_addr, len, pgoff, flags);
+ addr = mm_get_unmapped_area(current->mm, NULL, orig_addr, len, pgoff, flags);

return addr;
}
@@ -292,7 +289,7 @@ void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
gap == RLIM_INFINITY ||
sysctl_legacy_va_layout) {
mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
- mm->get_unmapped_area = arch_get_unmapped_area;
+ clear_bit(MMF_TOPDOWN, &mm->flags);
} else {
/* We know it's 32-bit */
unsigned long task_size = STACK_TOP32;
@@ -303,7 +300,7 @@ void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
gap = (task_size / 6 * 5);

mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
- mm->get_unmapped_area = arch_get_unmapped_area_topdown;
+ set_bit(MMF_TOPDOWN, &mm->flags);
}
}

diff --git a/arch/sparc/mm/hugetlbpage.c b/arch/sparc/mm/hugetlbpage.c
index b432500c13a5..38a1bef47efb 100644
--- a/arch/sparc/mm/hugetlbpage.c
+++ b/arch/sparc/mm/hugetlbpage.c
@@ -123,7 +123,7 @@ hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
(!vma || addr + len <= vm_start_gap(vma)))
return addr;
}
- if (mm->get_unmapped_area == arch_get_unmapped_area)
+ if (!test_bit(MMF_TOPDOWN, &mm->flags))
return hugetlb_get_unmapped_area_bottomup(file, addr, len,
pgoff, flags);
else
diff --git a/arch/x86/kernel/cpu/sgx/driver.c b/arch/x86/kernel/cpu/sgx/driver.c
index 262f5fb18d74..22b65a5f5ec6 100644
--- a/arch/x86/kernel/cpu/sgx/driver.c
+++ b/arch/x86/kernel/cpu/sgx/driver.c
@@ -113,7 +113,7 @@ static unsigned long sgx_get_unmapped_area(struct file *file,
if (flags & MAP_FIXED)
return addr;

- return current->mm->get_unmapped_area(file, addr, len, pgoff, flags);
+ return mm_get_unmapped_area(current->mm, file, addr, len, pgoff, flags);
}

#ifdef CONFIG_COMPAT
diff --git a/arch/x86/mm/hugetlbpage.c b/arch/x86/mm/hugetlbpage.c
index 5804bbae4f01..6d77c0039617 100644
--- a/arch/x86/mm/hugetlbpage.c
+++ b/arch/x86/mm/hugetlbpage.c
@@ -141,7 +141,7 @@ hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
}

get_unmapped_area:
- if (mm->get_unmapped_area == arch_get_unmapped_area)
+ if (!test_bit(MMF_TOPDOWN, &mm->flags))
return hugetlb_get_unmapped_area_bottomup(file, addr, len,
pgoff, flags);
else
diff --git a/arch/x86/mm/mmap.c b/arch/x86/mm/mmap.c
index c90c20904a60..a2cabb1c81e1 100644
--- a/arch/x86/mm/mmap.c
+++ b/arch/x86/mm/mmap.c
@@ -129,9 +129,9 @@ static void arch_pick_mmap_base(unsigned long *base, unsigned long *legacy_base,
void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
{
if (mmap_is_legacy())
- mm->get_unmapped_area = arch_get_unmapped_area;
+ clear_bit(MMF_TOPDOWN, &mm->flags);
else
- mm->get_unmapped_area = arch_get_unmapped_area_topdown;
+ set_bit(MMF_TOPDOWN, &mm->flags);

arch_pick_mmap_base(&mm->mmap_base, &mm->mmap_legacy_base,
arch_rnd(mmap64_rnd_bits), task_size_64bit(0),
diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 3c6670cf905f..9b80e622ae80 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -544,7 +544,7 @@ static unsigned long get_unmapped_area_zero(struct file *file,
}

/* Otherwise flags & MAP_PRIVATE: with no shmem object beneath it */
- return current->mm->get_unmapped_area(file, addr, len, pgoff, flags);
+ return mm_get_unmapped_area(current->mm, file, addr, len, pgoff, flags);
#else
return -ENOSYS;
#endif
diff --git a/drivers/dax/device.c b/drivers/dax/device.c
index 93ebedc5ec8c..47c126d37b59 100644
--- a/drivers/dax/device.c
+++ b/drivers/dax/device.c
@@ -329,14 +329,14 @@ static unsigned long dax_get_unmapped_area(struct file *filp,
if ((off + len_align) < off)
goto out;

- addr_align = current->mm->get_unmapped_area(filp, addr, len_align,
- pgoff, flags);
+ addr_align = mm_get_unmapped_area(current->mm, filp, addr, len_align,
+ pgoff, flags);
if (!IS_ERR_VALUE(addr_align)) {
addr_align += (off - addr_align) & (align - 1);
return addr_align;
}
out:
- return current->mm->get_unmapped_area(filp, addr, len, pgoff, flags);
+ return mm_get_unmapped_area(current->mm, filp, addr, len, pgoff, flags);
}

static const struct address_space_operations dev_dax_aops = {
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 6502c7e776d1..3dee18bf47ed 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -249,11 +249,11 @@ generic_hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
}

/*
- * Use mm->get_unmapped_area value as a hint to use topdown routine.
+ * Use MMF_TOPDOWN flag as a hint to use topdown routine.
* If architectures have special needs, they should define their own
* version of hugetlb_get_unmapped_area.
*/
- if (mm->get_unmapped_area == arch_get_unmapped_area_topdown)
+ if (test_bit(MMF_TOPDOWN, &mm->flags))
return hugetlb_get_unmapped_area_topdown(file, addr, len,
pgoff, flags);
return hugetlb_get_unmapped_area_bottomup(file, addr, len,
diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index 75396a24fd8c..d19434e2a58e 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -455,8 +455,9 @@ pde_get_unmapped_area(struct proc_dir_entry *pde, struct file *file, unsigned lo
return pde->proc_ops->proc_get_unmapped_area(file, orig_addr, len, pgoff, flags);

#ifdef CONFIG_MMU
- return current->mm->get_unmapped_area(file, orig_addr, len, pgoff, flags);
+ return mm_get_unmapped_area(current->mm, file, orig_addr, len, pgoff, flags);
#endif
+
return orig_addr;
}

diff --git a/fs/ramfs/file-mmu.c b/fs/ramfs/file-mmu.c
index c7a1aa3c882b..b45c7edc3225 100644
--- a/fs/ramfs/file-mmu.c
+++ b/fs/ramfs/file-mmu.c
@@ -35,7 +35,7 @@ static unsigned long ramfs_mmu_get_unmapped_area(struct file *file,
unsigned long addr, unsigned long len, unsigned long pgoff,
unsigned long flags)
{
- return current->mm->get_unmapped_area(file, addr, len, pgoff, flags);
+ return mm_get_unmapped_area(current->mm, file, addr, len, pgoff, flags);
}

const struct file_operations ramfs_file_operations = {
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 5240bd7bca33..9313e43123d4 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -777,11 +777,7 @@ struct mm_struct {
} ____cacheline_aligned_in_smp;

struct maple_tree mm_mt;
-#ifdef CONFIG_MMU
- unsigned long (*get_unmapped_area) (struct file *filp,
- unsigned long addr, unsigned long len,
- unsigned long pgoff, unsigned long flags);
-#endif
+
unsigned long mmap_base; /* base of mmap area */
unsigned long mmap_legacy_base; /* base of mmap area in bottom-up allocations */
#ifdef CONFIG_HAVE_ARCH_COMPAT_MMAP_BASES
diff --git a/include/linux/sched/coredump.h b/include/linux/sched/coredump.h
index 02f5090ffea2..e62ff805cfc9 100644
--- a/include/linux/sched/coredump.h
+++ b/include/linux/sched/coredump.h
@@ -92,9 +92,12 @@ static inline int get_dumpable(struct mm_struct *mm)
#define MMF_VM_MERGE_ANY 30
#define MMF_VM_MERGE_ANY_MASK (1 << MMF_VM_MERGE_ANY)

+#define MMF_TOPDOWN 31 /* mm searches top down by default */
+#define MMF_TOPDOWN_MASK (1 << MMF_TOPDOWN)
+
#define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK |\
MMF_DISABLE_THP_MASK | MMF_HAS_MDWE_MASK |\
- MMF_VM_MERGE_ANY_MASK)
+ MMF_VM_MERGE_ANY_MASK | MMF_TOPDOWN_MASK)

static inline unsigned long mmf_init_flags(unsigned long flags)
{
diff --git a/include/linux/sched/mm.h b/include/linux/sched/mm.h
index b6543f9d78d6..ed1caa26c8be 100644
--- a/include/linux/sched/mm.h
+++ b/include/linux/sched/mm.h
@@ -8,6 +8,7 @@
#include <linux/mm_types.h>
#include <linux/gfp.h>
#include <linux/sync_core.h>
+#include <linux/sched/coredump.h>

/*
* Routines for handling mm_structs
@@ -186,6 +187,10 @@ arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
unsigned long len, unsigned long pgoff,
unsigned long flags);

+unsigned long mm_get_unmapped_area(struct mm_struct *mm, struct file *filp,
+ unsigned long addr, unsigned long len,
+ unsigned long pgoff, unsigned long flags);
+
unsigned long
generic_get_unmapped_area(struct file *filp, unsigned long addr,
unsigned long len, unsigned long pgoff,
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 5d4b448fdc50..405bab0a560c 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -3520,7 +3520,7 @@ static unsigned long io_uring_mmu_get_unmapped_area(struct file *filp,
#else
addr = 0UL;
#endif
- return current->mm->get_unmapped_area(filp, addr, len, pgoff, flags);
+ return mm_get_unmapped_area(current->mm, filp, addr, len, pgoff, flags);
}

#else /* !CONFIG_MMU */
diff --git a/kernel/bpf/arena.c b/kernel/bpf/arena.c
index 86571e760dd6..74d566dcd2cb 100644
--- a/kernel/bpf/arena.c
+++ b/kernel/bpf/arena.c
@@ -314,7 +314,7 @@ static unsigned long arena_get_unmapped_area(struct file *filp, unsigned long ad
return -EINVAL;
}

- ret = current->mm->get_unmapped_area(filp, addr, len * 2, 0, flags);
+ ret = mm_get_unmapped_area(current->mm, filp, addr, len * 2, 0, flags);
if (IS_ERR_VALUE(ret))
return ret;
if ((ret >> 32) == ((ret + len - 1) >> 32))
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index ae2ff73bde7e..dead5e1977d8 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -980,7 +980,7 @@ static unsigned long bpf_get_unmapped_area(struct file *filp, unsigned long addr
if (map->ops->map_get_unmapped_area)
return map->ops->map_get_unmapped_area(filp, addr, len, pgoff, flags);
#ifdef CONFIG_MMU
- return current->mm->get_unmapped_area(filp, addr, len, pgoff, flags);
+ return mm_get_unmapped_area(current->mm, filp, addr, len, pgoff, flags);
#else
return addr;
#endif
diff --git a/mm/debug.c b/mm/debug.c
index c1c1a6a484e4..37a17f77df9f 100644
--- a/mm/debug.c
+++ b/mm/debug.c
@@ -180,9 +180,6 @@ EXPORT_SYMBOL(dump_vma);
void dump_mm(const struct mm_struct *mm)
{
pr_emerg("mm %px task_size %lu\n"
-#ifdef CONFIG_MMU
- "get_unmapped_area %px\n"
-#endif
"mmap_base %lu mmap_legacy_base %lu\n"
"pgd %px mm_users %d mm_count %d pgtables_bytes %lu map_count %d\n"
"hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n"
@@ -208,9 +205,6 @@ void dump_mm(const struct mm_struct *mm)
"def_flags: %#lx(%pGv)\n",

mm, mm->task_size,
-#ifdef CONFIG_MMU
- mm->get_unmapped_area,
-#endif
mm->mmap_base, mm->mmap_legacy_base,
mm->pgd, atomic_read(&mm->mm_users),
atomic_read(&mm->mm_count),
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 9859aa4f7553..cede9ccb84dc 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -824,8 +824,8 @@ static unsigned long __thp_get_unmapped_area(struct file *filp,
if (len_pad < len || (off + len_pad) < off)
return 0;

- ret = current->mm->get_unmapped_area(filp, addr, len_pad,
- off >> PAGE_SHIFT, flags);
+ ret = mm_get_unmapped_area(current->mm, filp, addr, len_pad,
+ off >> PAGE_SHIFT, flags);

/*
* The failure might be due to length padding. The caller will retry
@@ -843,8 +843,7 @@ static unsigned long __thp_get_unmapped_area(struct file *filp,

off_sub = (off - ret) & (size - 1);

- if (current->mm->get_unmapped_area == arch_get_unmapped_area_topdown &&
- !off_sub)
+ if (test_bit(MMF_TOPDOWN, &current->mm->flags) && !off_sub)
return ret + size;

ret += off_sub;
@@ -861,7 +860,7 @@ unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr,
if (ret)
return ret;

- return current->mm->get_unmapped_area(filp, addr, len, pgoff, flags);
+ return mm_get_unmapped_area(current->mm, filp, addr, len, pgoff, flags);
}
EXPORT_SYMBOL_GPL(thp_get_unmapped_area);

diff --git a/mm/mmap.c b/mm/mmap.c
index 6dbda99a47da..224e9ce1e2fd 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1813,7 +1813,8 @@ get_unmapped_area(struct file *file, unsigned long addr, unsigned long len,
unsigned long pgoff, unsigned long flags)
{
unsigned long (*get_area)(struct file *, unsigned long,
- unsigned long, unsigned long, unsigned long);
+ unsigned long, unsigned long, unsigned long)
+ = NULL;

unsigned long error = arch_mmap_check(addr, len, flags);
if (error)
@@ -1823,7 +1824,6 @@ get_unmapped_area(struct file *file, unsigned long addr, unsigned long len,
if (len > TASK_SIZE)
return -ENOMEM;

- get_area = current->mm->get_unmapped_area;
if (file) {
if (file->f_op->get_unmapped_area)
get_area = file->f_op->get_unmapped_area;
@@ -1842,7 +1842,11 @@ get_unmapped_area(struct file *file, unsigned long addr, unsigned long len,
if (!file)
pgoff = 0;

- addr = get_area(file, addr, len, pgoff, flags);
+ if (get_area)
+ addr = get_area(file, addr, len, pgoff, flags);
+ else
+ addr = mm_get_unmapped_area(current->mm, file, addr, len,
+ pgoff, flags);
if (IS_ERR_VALUE(addr))
return addr;

@@ -1857,6 +1861,17 @@ get_unmapped_area(struct file *file, unsigned long addr, unsigned long len,

EXPORT_SYMBOL(get_unmapped_area);

+unsigned long
+mm_get_unmapped_area(struct mm_struct *mm, struct file *file,
+ unsigned long addr, unsigned long len,
+ unsigned long pgoff, unsigned long flags)
+{
+ if (test_bit(MMF_TOPDOWN, &mm->flags))
+ return arch_get_unmapped_area_topdown(file, addr, len, pgoff, flags);
+ return arch_get_unmapped_area(file, addr, len, pgoff, flags);
+}
+EXPORT_SYMBOL(mm_get_unmapped_area);
+
/**
* find_vma_intersection() - Look up the first VMA which intersects the interval
* @mm: The process address space.
diff --git a/mm/shmem.c b/mm/shmem.c
index 0aad0d9a621b..4078c3a1b2d0 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2273,8 +2273,6 @@ unsigned long shmem_get_unmapped_area(struct file *file,
unsigned long uaddr, unsigned long len,
unsigned long pgoff, unsigned long flags)
{
- unsigned long (*get_area)(struct file *,
- unsigned long, unsigned long, unsigned long, unsigned long);
unsigned long addr;
unsigned long offset;
unsigned long inflated_len;
@@ -2284,8 +2282,8 @@ unsigned long shmem_get_unmapped_area(struct file *file,
if (len > TASK_SIZE)
return -ENOMEM;

- get_area = current->mm->get_unmapped_area;
- addr = get_area(file, uaddr, len, pgoff, flags);
+ addr = mm_get_unmapped_area(current->mm, file, uaddr, len, pgoff,
+ flags);

if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE))
return addr;
@@ -2342,7 +2340,8 @@ unsigned long shmem_get_unmapped_area(struct file *file,
if (inflated_len < len)
return addr;

- inflated_addr = get_area(NULL, uaddr, inflated_len, 0, flags);
+ inflated_addr = mm_get_unmapped_area(current->mm, NULL, uaddr,
+ inflated_len, 0, flags);
if (IS_ERR_VALUE(inflated_addr))
return addr;
if (inflated_addr & ~PAGE_MASK)
@@ -4807,7 +4806,7 @@ unsigned long shmem_get_unmapped_area(struct file *file,
unsigned long addr, unsigned long len,
unsigned long pgoff, unsigned long flags)
{
- return current->mm->get_unmapped_area(file, addr, len, pgoff, flags);
+ return mm_get_unmapped_area(current->mm, file, addr, len, pgoff, flags);
}
#endif

diff --git a/mm/util.c b/mm/util.c
index 669397235787..8619d353a1aa 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -469,17 +469,17 @@ void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)

if (mmap_is_legacy(rlim_stack)) {
mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
- mm->get_unmapped_area = arch_get_unmapped_area;
+ clear_bit(MMF_TOPDOWN, &mm->flags);
} else {
mm->mmap_base = mmap_base(random_factor, rlim_stack);
- mm->get_unmapped_area = arch_get_unmapped_area_topdown;
+ set_bit(MMF_TOPDOWN, &mm->flags);
}
}
#elif defined(CONFIG_MMU) && !defined(HAVE_ARCH_PICK_MMAP_LAYOUT)
void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
{
mm->mmap_base = TASK_UNMAPPED_BASE;
- mm->get_unmapped_area = arch_get_unmapped_area;
+ clear_bit(MMF_TOPDOWN, &mm->flags);
}
#endif

--
2.34.1