+ mm-sparc64-introduce-arch_mmap_hint.patch added to mm-unstable branch

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

The patch titled
     Subject: mm: sparc64: introduce arch_mmap_hint()
has been added to the -mm mm-unstable branch.  Its filename is
     mm-sparc64-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-sparc64-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@google.com>
Subject: mm: sparc64: introduce arch_mmap_hint()
Date: Wed, 11 Dec 2024 15:27:51 -0800

Introduce sparc64 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/20241211232754.1583023-14-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/sparc/include/asm/pgtable_64.h |    1 
 arch/sparc/kernel/sys_sparc_64.c    |  100 +++++++++-----------------
 2 files changed, 39 insertions(+), 62 deletions(-)

--- a/arch/sparc/include/asm/pgtable_64.h~mm-sparc64-introduce-arch_mmap_hint
+++ a/arch/sparc/include/asm/pgtable_64.h
@@ -1148,6 +1148,7 @@ static inline bool pte_access_permitted(
  */
 #define HAVE_ARCH_UNMAPPED_AREA
 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
+#define HAVE_ARCH_MMAP_HINT
 
 /* We provide a special get_unmapped_area for framebuffer mmaps to try and use
  * the largest alignment possible such that larget PTEs can be used.
--- a/arch/sparc/kernel/sys_sparc_64.c~mm-sparc64-introduce-arch_mmap_hint
+++ a/arch/sparc/kernel/sys_sparc_64.c
@@ -98,17 +98,19 @@ static unsigned long get_align_mask(stru
 	return 0;
 }
 
-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 mm_struct *mm = current->mm;
-	struct vm_area_struct * vma;
-	unsigned long task_size = TASK_SIZE;
-	int do_color_align;
-	struct vm_unmapped_area_info info = {};
-	bool file_hugepage = false;
+	unsigned long task_size;
+	bool do_color_align;
+	bool file_hugepage;
+
+	task_size = test_thread_flag(TIF_32BIT) ? STACK_TOP32 : TASK_SIZE;
+	if (unlikely(len > task_size || len >= VA_EXCLUDE_START))
+		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
@@ -120,26 +122,29 @@ unsigned long arch_get_unmapped_area(str
 		return addr;
 	}
 
-	if (test_thread_flag(TIF_32BIT))
-		task_size = STACK_TOP32;
-	if (unlikely(len > task_size || len >= VA_EXCLUDE_START))
-		return -ENOMEM;
+	do_color_align = (filp || (flags & MAP_SHARED)) && !file_hugepage;
 
-	do_color_align = 0;
-	if ((filp || (flags & MAP_SHARED)) && !file_hugepage)
-		do_color_align = 1;
-
-	if (addr) {
-		if (do_color_align)
-			addr = COLOR_ALIGN(addr, pgoff);
-		else
-			addr = PAGE_ALIGN(addr);
-
-		vma = find_vma(mm, addr);
-		if (task_size - len >= addr &&
-		    (!vma || addr + len <= vm_start_gap(vma)))
-			return addr;
-	}
+	if (do_color_align)
+		addr = COLOR_ALIGN(addr, pgoff);
+	else
+		addr = PAGE_ALIGN(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 vm_unmapped_area_info info = {};
+	unsigned long task_size;
+	bool file_hugepage;
+
+	addr = arch_mmap_hint(filp, addr, len, pgoff, flags);
+	if (addr)
+		return addr;
+
+	task_size = test_thread_flag(TIF_32BIT) ? STACK_TOP32 : TASK_SIZE;
+	file_hugepage = filp && is_file_hugepages(filp);
 
 	info.length = len;
 	info.low_limit = TASK_UNMAPPED_BASE;
@@ -164,49 +169,20 @@ arch_get_unmapped_area_topdown(struct fi
 			  const unsigned long len, const unsigned long pgoff,
 			  const unsigned long flags, vm_flags_t vm_flags)
 {
-	struct vm_area_struct *vma;
 	struct mm_struct *mm = current->mm;
-	unsigned long task_size = STACK_TOP32;
 	unsigned long addr = addr0;
-	int do_color_align;
 	struct vm_unmapped_area_info info = {};
-	bool file_hugepage = false;
+	bool file_hugepage;
 
 	/* This should only ever run for 32-bit processes.  */
 	BUG_ON(!test_thread_flag(TIF_32BIT));
 
-	if (filp && is_file_hugepages(filp))
-		file_hugepage = true;
-
-	if (flags & MAP_FIXED) {
-		/* We do not accept a shared mapping if it would violate
-		 * cache aliasing constraints.
-		 */
-		if (!file_hugepage && (flags & MAP_SHARED) &&
-		    ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
-			return -EINVAL;
+	/* requesting a specific address */
+	addr = arch_mmap_hint(filp, addr, len, pgoff, flags);
+	if (addr)
 		return addr;
-	}
-
-	if (unlikely(len > task_size))
-		return -ENOMEM;
 
-	do_color_align = 0;
-	if ((filp || (flags & MAP_SHARED)) && !file_hugepage)
-		do_color_align = 1;
-
-	/* requesting a specific address */
-	if (addr) {
-		if (do_color_align)
-			addr = COLOR_ALIGN(addr, pgoff);
-		else
-			addr = PAGE_ALIGN(addr);
-
-		vma = find_vma(mm, addr);
-		if (task_size - len >= addr &&
-		    (!vma || addr + len <= vm_start_gap(vma)))
-			return addr;
-	}
+	file_hugepage = filp && is_file_hugepages(filp);
 
 	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