The patch titled
Subject: mm: sparc32: introduce arch_mmap_hint()
has been added to the -mm mm-unstable branch. Its filename is
mm-sparc32-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-sparc32-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: sparc32: introduce arch_mmap_hint()
Date: Wed, 11 Dec 2024 15:27:50 -0800
Introduce sparc32 arch_mmap_hint() and define HAVE_ARCH_MMAP_HINT.
If a sufficiently sized hole doesn't exist at the hint address, fallback
to searching the entire valid VA space instead of only the VA space above
the hint address.
Link: https://lkml.kernel.org/r/20241211232754.1583023-13-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/sparc/include/asm/pgtable_32.h | 1
arch/sparc/kernel/sys_sparc_32.c | 33 +++++++++++++++++---------
2 files changed, 23 insertions(+), 11 deletions(-)
--- a/arch/sparc/include/asm/pgtable_32.h~mm-sparc32-introduce-arch_mmap_hint
+++ a/arch/sparc/include/asm/pgtable_32.h
@@ -437,6 +437,7 @@ static inline int io_remap_pfn_range(str
/* We provide our own get_unmapped_area to cope with VA holes for userland */
#define HAVE_ARCH_UNMAPPED_AREA
+#define HAVE_ARCH_MMAP_HINT
#define pmd_pgtable(pmd) ((pgtable_t)__pmd_page(pmd))
--- a/arch/sparc/kernel/sys_sparc_32.c~mm-sparc32-introduce-arch_mmap_hint
+++ a/arch/sparc/kernel/sys_sparc_32.c
@@ -40,13 +40,17 @@ SYSCALL_DEFINE0(getpagesize)
return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */
}
-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 vm_unmapped_area_info info = {};
- bool file_hugepage = false;
+ bool file_hugepage;
+
+ /* See asm-sparc/uaccess.h */
+ if (len > TASK_SIZE - PAGE_SIZE)
+ return -ENOMEM;
- if (filp && is_file_hugepages(filp))
- file_hugepage = true;
+ file_hugepage = filp && is_file_hugepages(filp);
if (flags & MAP_FIXED) {
/* We do not accept a shared mapping if it would violate
@@ -58,14 +62,21 @@ unsigned long arch_get_unmapped_area(str
return addr;
}
- /* See asm-sparc/uaccess.h */
- if (len > TASK_SIZE - PAGE_SIZE)
- return -ENOMEM;
- if (!addr)
- addr = TASK_UNMAPPED_BASE;
+ 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)
+{
+ struct vm_unmapped_area_info info = {};
+ bool file_hugepage = false;
+
+ addr = arch_mmap_hint(filp, addr, len, pgoff, flags);
+ if (addr)
+ return addr;
info.length = len;
- info.low_limit = addr;
+ info.low_limit = TASK_UNMAPPED_BASE;
info.high_limit = TASK_SIZE;
if (!file_hugepage) {
info.align_mask = (flags & MAP_SHARED) ?
_
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
