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

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

The patch titled
     Subject: mm: powerpc: introduce arch_mmap_hint()
has been added to the -mm mm-unstable branch.  Its filename is
     mm-powerpc-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-powerpc-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: powerpc: introduce arch_mmap_hint()
Date: Wed, 11 Dec 2024 15:27:53 -0800

Introduce powerpc 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/20241211232754.1583023-16-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/powerpc/include/asm/book3s/64/slice.h |    1 
 arch/powerpc/mm/book3s64/slice.c           |   31 +++++++++++++++++++
 2 files changed, 32 insertions(+)

--- a/arch/powerpc/include/asm/book3s/64/slice.h~mm-powerpc-introduce-arch_mmap_hint
+++ a/arch/powerpc/include/asm/book3s/64/slice.h
@@ -10,6 +10,7 @@
 #endif
 #define HAVE_ARCH_UNMAPPED_AREA
 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
+#define HAVE_ARCH_MMAP_HINT
 #endif
 
 #define SLICE_LOW_SHIFT		28
--- a/arch/powerpc/mm/book3s64/slice.c~mm-powerpc-introduce-arch_mmap_hint
+++ a/arch/powerpc/mm/book3s64/slice.c
@@ -647,6 +647,37 @@ static int file_to_psize(struct file *fi
 }
 #endif
 
+static unsigned long slice_mmap_hint(unsigned long addr, unsigned long len,
+				     unsigned long flags, unsigned int psize)
+{
+	unsigned long hint_addr = slice_get_unmapped_area(addr, len, flags, psize, 0);
+
+	if (IS_ERR_VALUE(hint_addr) || hint_addr == PAGE_ALIGN(addr))
+		return hint_addr;
+
+	return 0;
+}
+
+unsigned long arch_mmap_hint(struct file *filp, unsigned long addr,
+			     unsigned long len, unsigned long pgoff,
+			     unsigned long flags)
+{
+	unsigned int psize;
+
+	if (!addr)
+		return 0;
+
+	if (radix_enabled())
+		return generic_mmap_hint(filp, addr, len, pgoff, flags);
+
+	if (filp && is_file_hugepages(filp))
+		psize = file_to_psize(filp);
+	else
+		psize = mm_ctx_user_psize(&current->mm->context);
+
+	return slice_mmap_hint(addr, len, flags, psize);
+}
+
 unsigned long arch_get_unmapped_area(struct file *filp,
 				     unsigned long addr,
 				     unsigned long 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