On 02/26/2016 10:53 AM, Will Deacon wrote:
On Mon, Feb 22, 2016 at 05:58:23PM -0800, David Daney wrote:
From: Ganapatrao Kulkarni <gkulkarni@xxxxxxxxxxxxxxxxxx>
Enable NUMA balancing for arm64 platforms.
Add pte, pmd protnone helpers for use by automatic NUMA balancing.
Reviewed-by: Robert Richter <rrichter@xxxxxxxxxx>
Signed-off-by: Ganapatrao Kulkarni <gkulkarni@xxxxxxxxxxxxxxxxxx>
Signed-off-by: David Daney <david.daney@xxxxxxxxxx>
---
arch/arm64/Kconfig | 1 +
arch/arm64/include/asm/pgtable.h | 15 +++++++++++++++
2 files changed, 16 insertions(+)
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 9f0972a..6e22503 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -11,6 +11,7 @@ config ARM64
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
select ARCH_USE_CMPXCHG_LOCKREF
select ARCH_SUPPORTS_ATOMIC_RMW
+ select ARCH_SUPPORTS_NUMA_BALANCING
select ARCH_WANT_OPTIONAL_GPIOLIB
select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
select ARCH_WANT_FRAME_POINTERS
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index bf464de..5af9db2 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -346,6 +346,21 @@ static inline pgprot_t mk_sect_prot(pgprot_t prot)
return __pgprot(pgprot_val(prot) & ~PTE_TABLE_BIT);
}
+#ifdef CONFIG_NUMA_BALANCING
+/*
+ * See the comment in include/asm-generic/pgtable.h
+ */
+static inline int pte_protnone(pte_t pte)
+{
+ return (pte_val(pte) & (PTE_VALID | PTE_PROT_NONE)) == PTE_PROT_NONE;
+}
+
+static inline int pmd_protnone(pmd_t pmd)
+{
+ return pte_protnone(pmd_pte(pmd));
+}
+#endif
Can these not be macros, like our other pte_* and pmd_* predicates in
this header file?
They probably could be. However there is precedence for the static
inline form:
$ git grep pte_protnone | grep '\.h' | grep -v return
arch/arm64/include/asm/pgtable.h:static inline int pte_protnone(pte_t pte)
arch/powerpc/include/asm/book3s/64/hash.h:static inline int
pte_protnone(pte_t pte)
arch/powerpc/include/asm/nohash/pgtable.h:static inline int
pte_protnone(pte_t pte)
arch/s390/include/asm/pgtable.h:static inline int pte_protnone(pte_t pte)
arch/x86/include/asm/pgtable.h:static inline int pte_protnone(pte_t pte)
include/asm-generic/pgtable.h:static inline int pte_protnone(pte_t pte)
Actually I am a little surprised that all the arm64 pte_* and pmd_*
things are not written as static inline to achieve added type safety.
The generated code should be identical.
Will
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