diff mbox series

[RFC,v2,2/4] mm: Add hint and mmap_flags to struct vm_unmapped_area_info

Message ID 20240829-patches-below_hint_mmap-v2-2-638a28d9eae0@rivosinc.com (mailing list archive)
State New
Headers show
Series mm: Introduce MAP_BELOW_HINT | expand

Commit Message

Charlie Jenkins Aug. 29, 2024, 7:15 a.m. UTC 
The hint address and mmap_flags are necessary to determine if
MAP_BELOW_HINT requirements are satisfied.

Signed-off-by: Charlie Jenkins <charlie@rivosinc.com>
---
 arch/alpha/kernel/osf_sys.c      | 2 ++
 arch/arc/mm/mmap.c               | 3 +++
 arch/arm/mm/mmap.c               | 7 +++++++
 arch/csky/abiv1/mmap.c           | 3 +++
 arch/loongarch/mm/mmap.c         | 3 +++
 arch/mips/mm/mmap.c              | 3 +++
 arch/parisc/kernel/sys_parisc.c  | 3 +++
 arch/powerpc/mm/book3s64/slice.c | 7 +++++++
 arch/s390/mm/hugetlbpage.c       | 4 ++++
 arch/s390/mm/mmap.c              | 6 ++++++
 arch/sh/mm/mmap.c                | 6 ++++++
 arch/sparc/kernel/sys_sparc_32.c | 3 +++
 arch/sparc/kernel/sys_sparc_64.c | 6 ++++++
 arch/sparc/mm/hugetlbpage.c      | 4 ++++
 arch/x86/kernel/sys_x86_64.c     | 6 ++++++
 arch/x86/mm/hugetlbpage.c        | 4 ++++
 fs/hugetlbfs/inode.c             | 4 ++++
 include/linux/mm.h               | 2 ++
 mm/mmap.c                        | 6 ++++++
 19 files changed, 82 insertions(+)

Comments

Lorenzo Stoakes Aug. 29, 2024, 8:48 a.m. UTC | #1 
On Thu, Aug 29, 2024 at 12:15:59AM GMT, Charlie Jenkins wrote:

[snip]

> diff --git a/mm/mmap.c b/mm/mmap.c
> index d0dfc85b209b..34ba0db23678 100644
> --- a/mm/mmap.c
> +++ b/mm/mmap.c
> @@ -1796,6 +1796,9 @@ generic_get_unmapped_area(struct file *filp, unsigned long addr,
>  	struct vm_unmapped_area_info info = {};
>  	const unsigned long mmap_end = arch_get_mmap_end(addr, len, flags);
>
> +	info.hint = addr;
> +	info.mmap_flags = flags;
> +
>  	if (len > mmap_end - mmap_min_addr)
>  		return -ENOMEM;
>
> @@ -1841,6 +1844,9 @@ generic_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
>  	struct vm_unmapped_area_info info = {};
>  	const unsigned long mmap_end = arch_get_mmap_end(addr, len, flags);
>
> +	info.hint = addr;
> +	info.mmap_flags = flags;
> +
>  	/* requested length too big for entire address space */
>  	if (len > mmap_end - mmap_min_addr)
>  		return -ENOMEM;
>

These line numbers suggest you're working against Linus's tree, mm/mmap.c
has changed a lot recently, so to avoid conflicts please base your changes
on mm-unstable in Andrew's tree (if looking to go through that) or at least
-next.

> --
> 2.45.0
>
Charlie Jenkins Aug. 30, 2024, 1:11 a.m. UTC | #2 
On Thu, Aug 29, 2024 at 09:48:44AM +0100, Lorenzo Stoakes wrote:
> On Thu, Aug 29, 2024 at 12:15:59AM GMT, Charlie Jenkins wrote:
> 
> [snip]
> 
> > diff --git a/mm/mmap.c b/mm/mmap.c
> > index d0dfc85b209b..34ba0db23678 100644
> > --- a/mm/mmap.c
> > +++ b/mm/mmap.c
> > @@ -1796,6 +1796,9 @@ generic_get_unmapped_area(struct file *filp, unsigned long addr,
> >  	struct vm_unmapped_area_info info = {};
> >  	const unsigned long mmap_end = arch_get_mmap_end(addr, len, flags);
> >
> > +	info.hint = addr;
> > +	info.mmap_flags = flags;
> > +
> >  	if (len > mmap_end - mmap_min_addr)
> >  		return -ENOMEM;
> >
> > @@ -1841,6 +1844,9 @@ generic_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
> >  	struct vm_unmapped_area_info info = {};
> >  	const unsigned long mmap_end = arch_get_mmap_end(addr, len, flags);
> >
> > +	info.hint = addr;
> > +	info.mmap_flags = flags;
> > +
> >  	/* requested length too big for entire address space */
> >  	if (len > mmap_end - mmap_min_addr)
> >  		return -ENOMEM;
> >
> 
> These line numbers suggest you're working against Linus's tree, mm/mmap.c
> has changed a lot recently, so to avoid conflicts please base your changes
> on mm-unstable in Andrew's tree (if looking to go through that) or at least
> -next.

I will make sure that I base off of mm-unstable for future revisions.

- Charlie

> 
> > --
> > 2.45.0
> >
Christophe Leroy Sept. 3, 2024, 5:18 p.m. UTC | #3 
Hi Charlie,

Le 29/08/2024 à 09:15, Charlie Jenkins a écrit :
> The hint address and mmap_flags are necessary to determine if
> MAP_BELOW_HINT requirements are satisfied.
> 
> Signed-off-by: Charlie Jenkins <charlie@rivosinc.com>
> ---
>   arch/alpha/kernel/osf_sys.c      | 2 ++
>   arch/arc/mm/mmap.c               | 3 +++
>   arch/arm/mm/mmap.c               | 7 +++++++
>   arch/csky/abiv1/mmap.c           | 3 +++
>   arch/loongarch/mm/mmap.c         | 3 +++
>   arch/mips/mm/mmap.c              | 3 +++
>   arch/parisc/kernel/sys_parisc.c  | 3 +++
>   arch/powerpc/mm/book3s64/slice.c | 7 +++++++
>   arch/s390/mm/hugetlbpage.c       | 4 ++++
>   arch/s390/mm/mmap.c              | 6 ++++++
>   arch/sh/mm/mmap.c                | 6 ++++++
>   arch/sparc/kernel/sys_sparc_32.c | 3 +++
>   arch/sparc/kernel/sys_sparc_64.c | 6 ++++++
>   arch/sparc/mm/hugetlbpage.c      | 4 ++++
>   arch/x86/kernel/sys_x86_64.c     | 6 ++++++
>   arch/x86/mm/hugetlbpage.c        | 4 ++++
>   fs/hugetlbfs/inode.c             | 4 ++++
>   include/linux/mm.h               | 2 ++
>   mm/mmap.c                        | 6 ++++++
>   19 files changed, 82 insertions(+)
> 

>   
> diff --git a/arch/powerpc/mm/book3s64/slice.c b/arch/powerpc/mm/book3s64/slice.c
> index ef3ce37f1bb3..f0e2550af6d0 100644
> --- a/arch/powerpc/mm/book3s64/slice.c
> +++ b/arch/powerpc/mm/book3s64/slice.c
> @@ -286,6 +286,10 @@ static unsigned long slice_find_area_bottomup(struct mm_struct *mm,
>   		.length = len,
>   		.align_mask = PAGE_MASK & ((1ul << pshift) - 1),
>   	};
> +
> +	info.hint = addr;
> +	info.mmap_flags = flags;
> +
>   	/*
>   	 * Check till the allow max value for this mmap request
>   	 */
> @@ -331,6 +335,9 @@ static unsigned long slice_find_area_topdown(struct mm_struct *mm,
>   	};
>   	unsigned long min_addr = max(PAGE_SIZE, mmap_min_addr);
>   
> +	info.hint = addr;
> +	info.mmap_flags = flags;
> +
>   	/*
>   	 * If we are trying to allocate above DEFAULT_MAP_WINDOW
>   	 * Add the different to the mmap_base.

ppc64_defconfig:

   CC      arch/powerpc/mm/book3s64/slice.o
arch/powerpc/mm/book3s64/slice.c: In function 'slice_find_area_bottomup':
arch/powerpc/mm/book3s64/slice.c:291:27: error: 'flags' undeclared 
(first use in this function)
   291 |         info.mmap_flags = flags;
       |                           ^~~~~
arch/powerpc/mm/book3s64/slice.c:291:27: note: each undeclared 
identifier is reported only once for each function it appears in
arch/powerpc/mm/book3s64/slice.c: In function 'slice_find_area_topdown':
arch/powerpc/mm/book3s64/slice.c:339:27: error: 'flags' undeclared 
(first use in this function)
   339 |         info.mmap_flags = flags;
       |                           ^~~~~
make[5]: *** [scripts/Makefile.build:244: 
arch/powerpc/mm/book3s64/slice.o] Error 1
diff mbox series

Patch

diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c
index e5f881bc8288..6903700afd12 100644
--- a/arch/alpha/kernel/osf_sys.c
+++ b/arch/alpha/kernel/osf_sys.c
@@ -1223,6 +1223,8 @@  arch_get_unmapped_area_1(unsigned long addr, unsigned long len,
 	info.length = len;
 	info.low_limit = addr;
 	info.high_limit = limit;
+	info.hint = addr;
+	info.mmap_flags = flags;
 	return vm_unmapped_area(&info);
 }
 
diff --git a/arch/arc/mm/mmap.c b/arch/arc/mm/mmap.c
index 69a915297155..5922cb51e029 100644
--- a/arch/arc/mm/mmap.c
+++ b/arch/arc/mm/mmap.c
@@ -29,6 +29,9 @@  arch_get_unmapped_area(struct file *filp, unsigned long addr,
 	struct vm_area_struct *vma;
 	struct vm_unmapped_area_info info = {};
 
+	info.hint = addr;
+	info.mmap_flags = flags;
+
 	/*
 	 * We enforce the MAP_FIXED case.
 	 */
diff --git a/arch/arm/mm/mmap.c b/arch/arm/mm/mmap.c
index d65d0e6ed10a..04d9234f049a 100644
--- a/arch/arm/mm/mmap.c
+++ b/arch/arm/mm/mmap.c
@@ -36,6 +36,9 @@  arch_get_unmapped_area(struct file *filp, unsigned long addr,
 	int aliasing = cache_is_vipt_aliasing();
 	struct vm_unmapped_area_info info = {};
 
+	info.hint = addr;
+	info.mmap_flags = flags;
+
 	/*
 	 * We only need to do colour alignment if either the I or D
 	 * caches alias.
@@ -56,6 +59,7 @@  arch_get_unmapped_area(struct file *filp, unsigned long addr,
 	if (len > TASK_SIZE)
 		return -ENOMEM;
 
+
 	if (addr) {
 		if (do_align)
 			addr = COLOUR_ALIGN(addr, pgoff);
@@ -88,6 +92,9 @@  arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
 	int aliasing = cache_is_vipt_aliasing();
 	struct vm_unmapped_area_info info = {};
 
+	info.hint = addr;
+	info.mmap_flags = flags;
+
 	/*
 	 * We only need to do colour alignment if either the I or D
 	 * caches alias.
diff --git a/arch/csky/abiv1/mmap.c b/arch/csky/abiv1/mmap.c
index 7f826331d409..0be4913c6cf3 100644
--- a/arch/csky/abiv1/mmap.c
+++ b/arch/csky/abiv1/mmap.c
@@ -35,6 +35,9 @@  arch_get_unmapped_area(struct file *filp, unsigned long addr,
 		.align_offset = pgoff << PAGE_SHIFT
 	};
 
+	info.hint = addr;
+	info.mmap_flags = flags;
+
 	/*
 	 * We only need to do colour alignment if either the I or D
 	 * caches alias.
diff --git a/arch/loongarch/mm/mmap.c b/arch/loongarch/mm/mmap.c
index 889030985135..7d1e8be20519 100644
--- a/arch/loongarch/mm/mmap.c
+++ b/arch/loongarch/mm/mmap.c
@@ -27,6 +27,9 @@  static unsigned long arch_get_unmapped_area_common(struct file *filp,
 	int do_color_align;
 	struct vm_unmapped_area_info info = {};
 
+	info.hint = addr;
+	info.mmap_flags = flags;
+
 	if (unlikely(len > TASK_SIZE))
 		return -ENOMEM;
 
diff --git a/arch/mips/mm/mmap.c b/arch/mips/mm/mmap.c
index 7e11d7b58761..22e8f9c8eaa0 100644
--- a/arch/mips/mm/mmap.c
+++ b/arch/mips/mm/mmap.c
@@ -36,6 +36,9 @@  static unsigned long arch_get_unmapped_area_common(struct file *filp,
 	int do_color_align;
 	struct vm_unmapped_area_info info = {};
 
+	info.hint = addr;
+	info.mmap_flags = flags;
+
 	if (unlikely(len > TASK_SIZE))
 		return -ENOMEM;
 
diff --git a/arch/parisc/kernel/sys_parisc.c b/arch/parisc/kernel/sys_parisc.c
index f7722451276e..2ac53f148624 100644
--- a/arch/parisc/kernel/sys_parisc.c
+++ b/arch/parisc/kernel/sys_parisc.c
@@ -108,6 +108,9 @@  static unsigned long arch_get_unmapped_area_common(struct file *filp,
 		.length = len
 	};
 
+	info.hint = addr;
+	info.mmap_flags = flags;
+
 	if (unlikely(len > TASK_SIZE))
 		return -ENOMEM;
 
diff --git a/arch/powerpc/mm/book3s64/slice.c b/arch/powerpc/mm/book3s64/slice.c
index ef3ce37f1bb3..f0e2550af6d0 100644
--- a/arch/powerpc/mm/book3s64/slice.c
+++ b/arch/powerpc/mm/book3s64/slice.c
@@ -286,6 +286,10 @@  static unsigned long slice_find_area_bottomup(struct mm_struct *mm,
 		.length = len,
 		.align_mask = PAGE_MASK & ((1ul << pshift) - 1),
 	};
+
+	info.hint = addr;
+	info.mmap_flags = flags;
+
 	/*
 	 * Check till the allow max value for this mmap request
 	 */
@@ -331,6 +335,9 @@  static unsigned long slice_find_area_topdown(struct mm_struct *mm,
 	};
 	unsigned long min_addr = max(PAGE_SIZE, mmap_min_addr);
 
+	info.hint = addr;
+	info.mmap_flags = flags;
+
 	/*
 	 * If we are trying to allocate above DEFAULT_MAP_WINDOW
 	 * Add the different to the mmap_base.
diff --git a/arch/s390/mm/hugetlbpage.c b/arch/s390/mm/hugetlbpage.c
index ded0eff58a19..dc38f7022037 100644
--- a/arch/s390/mm/hugetlbpage.c
+++ b/arch/s390/mm/hugetlbpage.c
@@ -254,6 +254,8 @@  static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *file,
 	info.low_limit = current->mm->mmap_base;
 	info.high_limit = TASK_SIZE;
 	info.align_mask = PAGE_MASK & ~huge_page_mask(h);
+	info.hint = addr;
+	info.mmap_flags = flags;
 	return vm_unmapped_area(&info);
 }
 
@@ -270,6 +272,8 @@  static unsigned long hugetlb_get_unmapped_area_topdown(struct file *file,
 	info.low_limit = PAGE_SIZE;
 	info.high_limit = current->mm->mmap_base;
 	info.align_mask = PAGE_MASK & ~huge_page_mask(h);
+	info.hint = addr;
+	info.mmap_flags = flags;
 	addr = vm_unmapped_area(&info);
 
 	/*
diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c
index 206756946589..001345df61b6 100644
--- a/arch/s390/mm/mmap.c
+++ b/arch/s390/mm/mmap.c
@@ -88,6 +88,9 @@  unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
 	struct vm_area_struct *vma;
 	struct vm_unmapped_area_info info = {};
 
+	info.hint = addr;
+	info.mmap_flags = flags;
+
 	if (len > TASK_SIZE - mmap_min_addr)
 		return -ENOMEM;
 
@@ -123,6 +126,9 @@  unsigned long arch_get_unmapped_area_topdown(struct file *filp, unsigned long ad
 	struct mm_struct *mm = current->mm;
 	struct vm_unmapped_area_info info = {};
 
+	info.hint = addr;
+	info.mmap_flags = flags;
+
 	/* requested length too big for entire address space */
 	if (len > TASK_SIZE - mmap_min_addr)
 		return -ENOMEM;
diff --git a/arch/sh/mm/mmap.c b/arch/sh/mm/mmap.c
index bee329d4149a..ab1f5613b5e2 100644
--- a/arch/sh/mm/mmap.c
+++ b/arch/sh/mm/mmap.c
@@ -59,6 +59,9 @@  unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
 	int do_colour_align;
 	struct vm_unmapped_area_info info = {};
 
+	info.hint = addr;
+	info.mmap_flags = flags;
+
 	if (flags & MAP_FIXED) {
 		/* We do not accept a shared mapping if it would violate
 		 * cache aliasing constraints.
@@ -107,6 +110,9 @@  arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
 	int do_colour_align;
 	struct vm_unmapped_area_info info = {};
 
+	info.hint = addr;
+	info.mmap_flags = flags;
+
 	if (flags & MAP_FIXED) {
 		/* We do not accept a shared mapping if it would violate
 		 * cache aliasing constraints.
diff --git a/arch/sparc/kernel/sys_sparc_32.c b/arch/sparc/kernel/sys_sparc_32.c
index 08a19727795c..bcc3242e003d 100644
--- a/arch/sparc/kernel/sys_sparc_32.c
+++ b/arch/sparc/kernel/sys_sparc_32.c
@@ -43,6 +43,9 @@  unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsi
 {
 	struct vm_unmapped_area_info info = {};
 
+	info.hint = addr;
+	info.mmap_flags = flags;
+
 	if (flags & MAP_FIXED) {
 		/* We do not accept a shared mapping if it would violate
 		 * cache aliasing constraints.
diff --git a/arch/sparc/kernel/sys_sparc_64.c b/arch/sparc/kernel/sys_sparc_64.c
index d9c3b34ca744..05de444d66f6 100644
--- a/arch/sparc/kernel/sys_sparc_64.c
+++ b/arch/sparc/kernel/sys_sparc_64.c
@@ -95,6 +95,9 @@  unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsi
 	int do_color_align;
 	struct vm_unmapped_area_info info = {};
 
+	info.hint = addr;
+	info.mmap_flags = flags;
+
 	if (flags & MAP_FIXED) {
 		/* We do not accept a shared mapping if it would violate
 		 * cache aliasing constraints.
@@ -155,6 +158,9 @@  arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
 	int do_color_align;
 	struct vm_unmapped_area_info info = {};
 
+	info.hint = addr;
+	info.mmap_flags = flags;
+
 	/* This should only ever run for 32-bit processes.  */
 	BUG_ON(!test_thread_flag(TIF_32BIT));
 
diff --git a/arch/sparc/mm/hugetlbpage.c b/arch/sparc/mm/hugetlbpage.c
index cc91ca7a1e18..148064142628 100644
--- a/arch/sparc/mm/hugetlbpage.c
+++ b/arch/sparc/mm/hugetlbpage.c
@@ -40,6 +40,8 @@  static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *filp,
 	info.low_limit = TASK_UNMAPPED_BASE;
 	info.high_limit = min(task_size, VA_EXCLUDE_START);
 	info.align_mask = PAGE_MASK & ~huge_page_mask(h);
+	info.hint = addr;
+	info.mmap_flags = flags;
 	addr = vm_unmapped_area(&info);
 
 	if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) {
@@ -71,6 +73,8 @@  hugetlb_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
 	info.low_limit = PAGE_SIZE;
 	info.high_limit = mm->mmap_base;
 	info.align_mask = PAGE_MASK & ~huge_page_mask(h);
+	info.hint = addr;
+	info.mmap_flags = flags;
 	addr = vm_unmapped_area(&info);
 
 	/*
diff --git a/arch/x86/kernel/sys_x86_64.c b/arch/x86/kernel/sys_x86_64.c
index 01d7cd85ef97..248a210c2b0b 100644
--- a/arch/x86/kernel/sys_x86_64.c
+++ b/arch/x86/kernel/sys_x86_64.c
@@ -129,6 +129,9 @@  arch_get_unmapped_area_vmflags(struct file *filp, unsigned long addr, unsigned l
 	struct vm_unmapped_area_info info = {};
 	unsigned long begin, end;
 
+	info.hint = addr;
+	info.mmap_flags = flags;
+
 	if (flags & MAP_FIXED)
 		return addr;
 
@@ -167,6 +170,9 @@  arch_get_unmapped_area_topdown_vmflags(struct file *filp, unsigned long addr0,
 	unsigned long addr = addr0;
 	struct vm_unmapped_area_info info = {};
 
+	info.hint = addr;
+	info.mmap_flags = flags;
+
 	/* requested length too big for entire address space */
 	if (len > TASK_SIZE)
 		return -ENOMEM;
diff --git a/arch/x86/mm/hugetlbpage.c b/arch/x86/mm/hugetlbpage.c
index 807a5859a3c4..d3f8cec4895d 100644
--- a/arch/x86/mm/hugetlbpage.c
+++ b/arch/x86/mm/hugetlbpage.c
@@ -29,6 +29,8 @@  static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *file,
 
 	info.length = len;
 	info.low_limit = get_mmap_base(1);
+	info.hint = addr;
+	info.mmap_flags = flags;
 
 	/*
 	 * If hint address is above DEFAULT_MAP_WINDOW, look for unmapped area
@@ -52,6 +54,8 @@  static unsigned long hugetlb_get_unmapped_area_topdown(struct file *file,
 	info.length = len;
 	info.low_limit = PAGE_SIZE;
 	info.high_limit = get_mmap_base(0);
+	info.hint = addr;
+	info.mmap_flags = flags;
 
 	/*
 	 * If hint address is above DEFAULT_MAP_WINDOW, look for unmapped area
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 9f6cff356796..4b35eadd2ad8 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -182,6 +182,8 @@  hugetlb_get_unmapped_area_bottomup(struct file *file, unsigned long addr,
 	info.low_limit = current->mm->mmap_base;
 	info.high_limit = arch_get_mmap_end(addr, len, flags);
 	info.align_mask = PAGE_MASK & ~huge_page_mask(h);
+	info.hint = addr;
+	info.mmap_flags = flags;
 	return vm_unmapped_area(&info);
 }
 
@@ -197,6 +199,8 @@  hugetlb_get_unmapped_area_topdown(struct file *file, unsigned long addr,
 	info.low_limit = PAGE_SIZE;
 	info.high_limit = arch_get_mmap_base(addr, current->mm->mmap_base);
 	info.align_mask = PAGE_MASK & ~huge_page_mask(h);
+	info.hint = addr;
+	info.mmap_flags = flags;
 	addr = vm_unmapped_area(&info);
 
 	/*
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 6549d0979b28..b5fcb9dfb942 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -3445,6 +3445,8 @@  struct vm_unmapped_area_info {
 	unsigned long align_mask;
 	unsigned long align_offset;
 	unsigned long start_gap;
+	unsigned long hint;
+	unsigned long mmap_flags;
 };
 
 extern unsigned long vm_unmapped_area(struct vm_unmapped_area_info *info);
diff --git a/mm/mmap.c b/mm/mmap.c
index d0dfc85b209b..34ba0db23678 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1796,6 +1796,9 @@  generic_get_unmapped_area(struct file *filp, unsigned long addr,
 	struct vm_unmapped_area_info info = {};
 	const unsigned long mmap_end = arch_get_mmap_end(addr, len, flags);
 
+	info.hint = addr;
+	info.mmap_flags = flags;
+
 	if (len > mmap_end - mmap_min_addr)
 		return -ENOMEM;
 
@@ -1841,6 +1844,9 @@  generic_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
 	struct vm_unmapped_area_info info = {};
 	const unsigned long mmap_end = arch_get_mmap_end(addr, len, flags);
 
+	info.hint = addr;
+	info.mmap_flags = flags;
+
 	/* requested length too big for entire address space */
 	if (len > mmap_end - mmap_min_addr)
 		return -ENOMEM;