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Date: Fri, 8 Apr 2022 09:25:00 +0200
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Christophe Leroy <christophe.leroy@...roup.eu>,
linux-kernel@...r.kernel.org, linux-mm@...ck.org,
linuxppc-dev@...ts.ozlabs.org, Nicholas Piggin <npiggin@...il.com>
Subject: [PATCH v9 2/4] mm, hugetlbfs: Allow an arch to always use generic versions of get_unmapped_area functions
Unlike most architectures, powerpc can only define at runtime
if it is going to use the generic arch_get_unmapped_area() or not.
Today, powerpc has a copy of the generic arch_get_unmapped_area()
because when selection HAVE_ARCH_UNMAPPED_AREA the generic
arch_get_unmapped_area() is not available.
Rename it generic_get_unmapped_area() and make it independent of
HAVE_ARCH_UNMAPPED_AREA.
Do the same for arch_get_unmapped_area_topdown() versus
HAVE_ARCH_UNMAPPED_AREA_TOPDOWN.
Do the same for hugetlb_get_unmapped_area() versus
HAVE_ARCH_HUGETLB_UNMAPPED_AREA.
Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
Reviewed-by: Nicholas Piggin <npiggin@...il.com>
---
fs/hugetlbfs/inode.c | 17 +++++++++++++----
include/linux/hugetlb.h | 5 +++++
include/linux/sched/mm.h | 9 +++++++++
mm/mmap.c | 31 ++++++++++++++++++++++++-------
4 files changed, 51 insertions(+), 11 deletions(-)
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 99c7477cee5c..09c8313ee1c4 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -195,7 +195,6 @@ static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma)
* Called under mmap_write_lock(mm).
*/
-#ifndef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
static unsigned long
hugetlb_get_unmapped_area_bottomup(struct file *file, unsigned long addr,
unsigned long len, unsigned long pgoff, unsigned long flags)
@@ -244,9 +243,10 @@ hugetlb_get_unmapped_area_topdown(struct file *file, unsigned long addr,
return addr;
}
-static unsigned long
-hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
- unsigned long len, unsigned long pgoff, unsigned long flags)
+unsigned long
+generic_hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
+ unsigned long len, unsigned long pgoff,
+ unsigned long flags)
{
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
@@ -282,6 +282,15 @@ hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
return hugetlb_get_unmapped_area_bottomup(file, addr, len,
pgoff, flags);
}
+
+#ifndef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
+static unsigned long
+hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
+ unsigned long len, unsigned long pgoff,
+ unsigned long flags)
+{
+ return generic_hugetlb_get_unmapped_area(file, addr, len, pgoff, flags);
+}
#endif
static size_t
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 53c1b6082a4c..10895adc7635 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -513,6 +513,11 @@ unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
unsigned long flags);
#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
+unsigned long
+generic_hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
+ unsigned long len, unsigned long pgoff,
+ unsigned long flags);
+
/*
* huegtlb page specific state flags. These flags are located in page.private
* of the hugetlb head page. Functions created via the below macros should be
diff --git a/include/linux/sched/mm.h b/include/linux/sched/mm.h
index a80356e9dc69..18b2d2b2e0ca 100644
--- a/include/linux/sched/mm.h
+++ b/include/linux/sched/mm.h
@@ -145,6 +145,15 @@ extern unsigned long
arch_get_unmapped_area_topdown(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,
+ unsigned long flags);
+unsigned long
+generic_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
+ unsigned long len, unsigned long pgoff,
+ unsigned long flags);
#else
static inline void arch_pick_mmap_layout(struct mm_struct *mm,
struct rlimit *rlim_stack) {}
diff --git a/mm/mmap.c b/mm/mmap.c
index 3aa839f81e63..08b40a9715ee 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2136,10 +2136,10 @@ unsigned long vm_unmapped_area(struct vm_unmapped_area_info *info)
*
* This function "knows" that -ENOMEM has the bits set.
*/
-#ifndef HAVE_ARCH_UNMAPPED_AREA
unsigned long
-arch_get_unmapped_area(struct file *filp, unsigned long addr,
- unsigned long len, unsigned long pgoff, unsigned long flags)
+generic_get_unmapped_area(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, *prev;
@@ -2169,17 +2169,25 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
info.align_offset = 0;
return vm_unmapped_area(&info);
}
+
+#ifndef HAVE_ARCH_UNMAPPED_AREA
+unsigned long
+arch_get_unmapped_area(struct file *filp, unsigned long addr,
+ unsigned long len, unsigned long pgoff,
+ unsigned long flags)
+{
+ return generic_get_unmapped_area(filp, addr, len, pgoff, flags);
+}
#endif
/*
* This mmap-allocator allocates new areas top-down from below the
* stack's low limit (the base):
*/
-#ifndef HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
unsigned long
-arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
- unsigned long len, unsigned long pgoff,
- unsigned long flags)
+generic_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
+ unsigned long len, unsigned long pgoff,
+ unsigned long flags)
{
struct vm_area_struct *vma, *prev;
struct mm_struct *mm = current->mm;
@@ -2227,6 +2235,15 @@ arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
return addr;
}
+
+#ifndef HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
+unsigned long
+arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
+ unsigned long len, unsigned long pgoff,
+ unsigned long flags)
+{
+ return generic_get_unmapped_area_topdown(filp, addr, len, pgoff, flags);
+}
#endif
unsigned long
--
2.35.1
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