The patch titled
Subject: mm: alpha: introduce arch_mmap_hint()
has been added to the -mm mm-unstable branch. Its filename is
mm-alpha-introduce-arch_mmap_hint.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-alpha-introduce-arch_mmap_hint.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Kalesh Singh <kaleshsingh@xxxxxxxxxx>
Subject: mm: alpha: introduce arch_mmap_hint()
Date: Wed, 11 Dec 2024 15:27:42 -0800
Introduce alpha arch_mmap_hint() and define HAVE_ARCH_MMAP_HINT. This is
a preparatory patch, no functional change is introduced.
Link: https://lkml.kernel.org/r/20241211232754.1583023-5-kaleshsingh@xxxxxxxxxx
Signed-off-by: Kalesh Singh <kaleshsingh@xxxxxxxxxx>
Cc: Andreas Larsson <andreas@xxxxxxxxxxx>
Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Cc: Borislav Petkov (AMD) <bp@xxxxxxxxx>
Cc: Breno Leitao <leitao@xxxxxxxxxx>
Cc: Chris Zankel <chris@xxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: David S. Miller <davem@xxxxxxxxxxxxx>
Cc: James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>
Cc: Jason Andryuk <jason.andryuk@xxxxxxx>
Cc: John Paul Adrian Glaubitz <glaubitz@xxxxxxxxxxxxxxxxxxx>
Cc: Max Filippov <jcmvbkbc@xxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Rich Felker <dalias@xxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxx>
Cc: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Yang Shi <yang@xxxxxxxxxxxxxxxxxxxxxx>
Cc: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/alpha/include/asm/pgtable.h | 1
arch/alpha/kernel/osf_sys.c | 31 ++++++++++++++++++-----------
2 files changed, 21 insertions(+), 11 deletions(-)
--- a/arch/alpha/include/asm/pgtable.h~mm-alpha-introduce-arch_mmap_hint
+++ a/arch/alpha/include/asm/pgtable.h
@@ -362,5 +362,6 @@ extern void paging_init(void);
/* We have our own get_unmapped_area to cope with ADDR_LIMIT_32BIT. */
#define HAVE_ARCH_UNMAPPED_AREA
+#define HAVE_ARCH_MMAP_HINT
#endif /* _ALPHA_PGTABLE_H */
--- a/arch/alpha/kernel/osf_sys.c~mm-alpha-introduce-arch_mmap_hint
+++ a/arch/alpha/kernel/osf_sys.c
@@ -1225,10 +1225,9 @@ arch_get_unmapped_area_1(unsigned long a
return vm_unmapped_area(&info);
}
-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)
{
unsigned long limit;
@@ -1241,8 +1240,15 @@ arch_get_unmapped_area(struct file *filp
if (len > limit)
return -ENOMEM;
- if (flags & MAP_FIXED)
- return addr;
+ 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)
+{
+ unsigned long limit;
/* First, see if the given suggestion fits.
@@ -1253,12 +1259,15 @@ arch_get_unmapped_area(struct file *filp
That said, I can see the use in being able to suggest not
merely specific addresses, but regions of memory -- perhaps
this feature should be incorporated into all ports? */
+ addr = arch_mmap_hint(filp, addr, len, pgoff, flags);
+ if (addr)
+ return addr;
- if (addr) {
- addr = arch_get_unmapped_area_1 (PAGE_ALIGN(addr), len, limit);
- if (addr != (unsigned long) -ENOMEM)
- return addr;
- }
+ /* "32 bit" actually means 31 bit, since pointers sign extend. */
+ if (current->personality & ADDR_LIMIT_32BIT)
+ limit = 0x80000000;
+ else
+ limit = TASK_SIZE;
/* Next, try allocating at TASK_UNMAPPED_BASE. */
addr = arch_get_unmapped_area_1 (PAGE_ALIGN(TASK_UNMAPPED_BASE),
_
Patches currently in -mm which might be from kaleshsingh@xxxxxxxxxx are
mm-introduce-generic_mmap_hint.patch
mm-x86-introduce-arch_mmap_hint.patch
mm-arm-introduce-arch_mmap_hint.patch
mm-alpha-introduce-arch_mmap_hint.patch
mm-arc-use-generic_mmap_hint.patch
mm-csky-introduce-arch_mmap_hint.patch
mm-loongarch-introduce-arch_mmap_hint.patch
mm-mips-introduce-arch_align_mmap_hint.patch
mm-parisc-introduce-arch_align_mmap_hint.patch
mm-s390-use-generic_mmap_hint.patch
mm-sh-introduce-arch_mmap_hint.patch
mm-sparc32-introduce-arch_mmap_hint.patch
mm-sparc64-introduce-arch_mmap_hint.patch
mm-xtensa-introduce-arch_mmap_hint.patch
mm-powerpc-introduce-arch_mmap_hint.patch
mm-respect-mmap-hint-before-thp-alignment-if-allocation-is-possible.patch
