+ mm-s390-use-generic_mmap_hint.patch added to mm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm: s390: use generic_mmap_hint()
has been added to the -mm mm-unstable branch.  Its filename is
     mm-s390-use-generic_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-s390-use-generic_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@google.com>
Subject: mm: s390: use generic_mmap_hint()
Date: Wed, 11 Dec 2024 15:27:48 -0800

Introduce s390 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/20241211232754.1583023-11-kaleshsingh@google.com
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>
Cc: Andreas Larsson <andreas@gaisler.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Borislav Petkov (AMD) <bp@alien8.de>
Cc: Breno Leitao <leitao@debian.org>
Cc: Chris Zankel <chris@zankel.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Jason Andryuk <jason.andryuk@amd.com>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Rich Felker <dalias@libc.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Yang Shi <yang@os.amperecomputing.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/s390/include/asm/pgtable.h |    1 
 arch/s390/mm/mmap.c             |   51 +++++++++++++-----------------
 2 files changed, 24 insertions(+), 28 deletions(-)

--- a/arch/s390/include/asm/pgtable.h~mm-s390-use-generic_mmap_hint
+++ a/arch/s390/include/asm/pgtable.h
@@ -1997,6 +1997,7 @@ extern void s390_reset_cmma(struct mm_st
 /* s390 has a private copy of get unmapped area to deal with cache synonyms */
 #define HAVE_ARCH_UNMAPPED_AREA
 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
+#define HAVE_ARCH_MMAP_HINT
 
 #define pmd_pgtable(pmd) \
 	((pgtable_t)__va(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE))
--- a/arch/s390/mm/mmap.c~mm-s390-use-generic_mmap_hint
+++ a/arch/s390/mm/mmap.c
@@ -83,28 +83,33 @@ static int get_align_mask(struct file *f
 	return 0;
 }
 
+unsigned long arch_mmap_hint(struct file *filp, unsigned long addr,
+			     unsigned long len, unsigned long pgoff,
+			     unsigned long flags)
+{
+	/* requested length too big for entire address space */
+	if (len > TASK_SIZE - mmap_min_addr)
+		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)
 {
 	struct mm_struct *mm = current->mm;
-	struct vm_area_struct *vma;
 	struct vm_unmapped_area_info info = {};
 
-	if (len > TASK_SIZE - mmap_min_addr)
-		return -ENOMEM;
-
-	if (flags & MAP_FIXED)
+	addr = arch_mmap_hint(filp, addr, len, pgoff, flags);
+	if (IS_ERR_VALUE(addr))
+		return addr;
+	if (addr)
 		goto check_asce_limit;
 
-	if (addr) {
-		addr = PAGE_ALIGN(addr);
-		vma = find_vma(mm, addr);
-		if (TASK_SIZE - len >= addr && addr >= mmap_min_addr &&
-		    (!vma || addr + len <= vm_start_gap(vma)))
-			goto check_asce_limit;
-	}
-
 	info.length = len;
 	info.low_limit = mm->mmap_base;
 	info.high_limit = TASK_SIZE;
@@ -123,25 +128,15 @@ unsigned long arch_get_unmapped_area_top
 					     unsigned long len, unsigned long pgoff,
 					     unsigned long flags, vm_flags_t vm_flags)
 {
-	struct vm_area_struct *vma;
 	struct mm_struct *mm = current->mm;
 	struct vm_unmapped_area_info info = {};
 
-	/* requested length too big for entire address space */
-	if (len > TASK_SIZE - mmap_min_addr)
-		return -ENOMEM;
-
-	if (flags & MAP_FIXED)
-		goto check_asce_limit;
-
 	/* requesting a specific address */
-	if (addr) {
-		addr = PAGE_ALIGN(addr);
-		vma = find_vma(mm, addr);
-		if (TASK_SIZE - len >= addr && addr >= mmap_min_addr &&
-				(!vma || addr + len <= vm_start_gap(vma)))
-			goto check_asce_limit;
-	}
+	addr = arch_mmap_hint(filp, addr, len, pgoff, flags);
+	if (IS_ERR_VALUE(addr))
+		return addr;
+	if (addr)
+		goto check_asce_limit;
 
 	info.flags = VM_UNMAPPED_AREA_TOPDOWN;
 	info.length = len;
_

Patches currently in -mm which might be from kaleshsingh@google.com 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