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Subject[patch 04/16] mm/softdirty: Move VM_SOFTDIRTY into high bits
From: Peter Zijlstra <peterz@infradead.org>

Only 64bit architectures (x86_64, s390, PPC_BOOK3S_64) have support for
HAVE_ARCH_SOFT_DIRTY, so ensure they all select ARCH_USES_HIGH_VMA_FLAGS
and move the VM_SOFTDIRTY flag into the high flags.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
arch/powerpc/platforms/Kconfig.cputype | 1 +
arch/s390/Kconfig | 1 +
include/linux/mm.h | 17 +++++++++++------
3 files changed, 13 insertions(+), 6 deletions(-)

--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -76,6 +76,7 @@ config PPC_BOOK3S_64
select ARCH_SUPPORTS_NUMA_BALANCING
select IRQ_WORK
select HAVE_KERNEL_XZ
+ select ARCH_USES_HIGH_VMA_FLAGS

config PPC_BOOK3E_64
bool "Embedded processors"
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -131,6 +131,7 @@ config S390
select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES
select HAVE_ARCH_SECCOMP_FILTER
select HAVE_ARCH_SOFT_DIRTY
+ select ARCH_USES_HIGH_VMA_FLAGS
select HAVE_ARCH_TRACEHOOK
select HAVE_ARCH_TRANSPARENT_HUGEPAGE
select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -194,12 +194,6 @@ extern unsigned int kobjsize(const void
#define VM_WIPEONFORK 0x02000000 /* Wipe VMA contents in child. */
#define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */

-#ifdef CONFIG_MEM_SOFT_DIRTY
-# define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */
-#else
-# define VM_SOFTDIRTY 0
-#endif
-
#define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */
#define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */
#define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */
@@ -216,8 +210,19 @@ extern unsigned int kobjsize(const void
#define VM_HIGH_ARCH_2 BIT(VM_HIGH_ARCH_BIT_2)
#define VM_HIGH_ARCH_3 BIT(VM_HIGH_ARCH_BIT_3)
#define VM_HIGH_ARCH_4 BIT(VM_HIGH_ARCH_BIT_4)
+
+#define VM_HIGH_SOFTDIRTY_BIT 37 /* bit only usable on 64-bit architectures */
#endif /* CONFIG_ARCH_USES_HIGH_VMA_FLAGS */

+#ifdef CONFIG_MEM_SOFT_DIRTY
+# ifndef CONFIG_ARCH_USES_HIGH_VMA_FLAGS
+# error MEM_SOFT_DIRTY depends on ARCH_USES_HIGH_VMA_FLAGS
+# endif
+# define VM_SOFTDIRTY BIT(VM_HIGH_SOFTDIRTY_BIT) /* Not soft dirty clean area */
+#else
+# define VM_SOFTDIRTY VM_NONE
+#endif
+
#if defined(CONFIG_X86)
# define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */
#if defined (CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS)

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