The patch titled
Subject: mm/ioremap: probe platform for p4d huge map support
has been added to the -mm tree. Its filename is
mm-ioremap-probe-platform-for-p4d-huge-map-support.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-ioremap-probe-platform-for-p4d-huge-map-support.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-ioremap-probe-platform-for-p4d-huge-map-support.patch
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------------------------------------------------------
From: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Subject: mm/ioremap: probe platform for p4d huge map support
Finishing up what c2febafc67734a ("mm: convert generic code to 5-level
paging") started out while levelling up P4D huge mapping support at par
with PUD and PMD. A new arch call back arch_ioremap_p4d_supported() is
being added which just maintains status quo (P4D huge map not supported)
on x86 and arm64.
Link: http://lkml.kernel.org/r/1560406781-14253-1-git-send-email-anshuman.khandual@xxxxxxx
Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Acked-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/arm64/mm/mmu.c | 5 +++++
arch/x86/mm/ioremap.c | 5 +++++
include/linux/io.h | 1 +
lib/ioremap.c | 2 ++
4 files changed, 13 insertions(+)
--- a/arch/arm64/mm/mmu.c~mm-ioremap-probe-platform-for-p4d-huge-map-support
+++ a/arch/arm64/mm/mmu.c
@@ -953,6 +953,11 @@ void *__init fixmap_remap_fdt(phys_addr_
return dt_virt;
}
+int __init arch_ioremap_p4d_supported(void)
+{
+ return 0;
+}
+
int __init arch_ioremap_pud_supported(void)
{
/*
--- a/arch/x86/mm/ioremap.c~mm-ioremap-probe-platform-for-p4d-huge-map-support
+++ a/arch/x86/mm/ioremap.c
@@ -440,6 +440,11 @@ void iounmap(volatile void __iomem *addr
}
EXPORT_SYMBOL(iounmap);
+int __init arch_ioremap_p4d_supported(void)
+{
+ return 0;
+}
+
int __init arch_ioremap_pud_supported(void)
{
#ifdef CONFIG_X86_64
--- a/include/linux/io.h~mm-ioremap-probe-platform-for-p4d-huge-map-support
+++ a/include/linux/io.h
@@ -45,6 +45,7 @@ static inline int ioremap_page_range(uns
#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
void __init ioremap_huge_init(void);
+int arch_ioremap_p4d_supported(void);
int arch_ioremap_pud_supported(void);
int arch_ioremap_pmd_supported(void);
#else
--- a/lib/ioremap.c~mm-ioremap-probe-platform-for-p4d-huge-map-support
+++ a/lib/ioremap.c
@@ -30,6 +30,8 @@ early_param("nohugeiomap", set_nohugeiom
void __init ioremap_huge_init(void)
{
if (!ioremap_huge_disabled) {
+ if (arch_ioremap_p4d_supported())
+ ioremap_p4d_capable = 1;
if (arch_ioremap_pud_supported())
ioremap_pud_capable = 1;
if (arch_ioremap_pmd_supported())
_
Patches currently in -mm which might be from anshuman.khandual@xxxxxxx are
mm-dev_pfn-exclude-memory_device_private-while-computing-virtual-address.patch
mm-pgtable-drop-pgtable_t-variable-from-pte_fn_t-functions.patch
mm-ioremap-check-virtual-address-alignment-while-creating-huge-mappings.patch
mm-ioremap-probe-platform-for-p4d-huge-map-support.patch
mm-generalize-and-rename-notify_page_fault-as-kprobe_page_fault.patch
