[to-be-updated] mm-mremap-allow-arch-runtime-override.patch removed from -mm tree

* [to-be-updated] mm-mremap-allow-arch-runtime-override.patch removed from -mm tree
@ 2021-06-17  0:59 akpm
  0 siblings, 0 replies; 2+ messages in thread
From: akpm @ 2021-06-17  0:59 UTC (permalink / raw)
  To: aneesh.kumar, christophe.leroy, joel, kaleshsingh, kirill,
	mm-commits, mpe, npiggin


The patch titled
     Subject: mm/mremap: allow arch runtime override
has been removed from the -mm tree.  Its filename was
     mm-mremap-allow-arch-runtime-override.patch

This patch was dropped because an updated version will be merged

------------------------------------------------------
From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Subject: mm/mremap: allow arch runtime override

Patch series "Speedup mremap on ppc64", v8.

This patchset enables MOVE_PMD/MOVE_PUD support on power. This requires
the platform to support updating higher-level page tables without
updating page table entries. This also needs to invalidate the Page Walk
Cache on architecture supporting the same.


This patch (of 3):

Architectures like ppc64 support faster mremap only with radix
translation.  Hence allow a runtime check w.r.t support for fast mremap.

Link: https://lkml.kernel.org/r/20210616045735.374532-1-aneesh.kumar@linux.ibm.com
Link: https://lkml.kernel.org/r/20210616045735.374532-2-aneesh.kumar@linux.ibm.com
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Kalesh Singh <kaleshsingh@google.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Joel Fernandes <joel@joelfernandes.org>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Kirill A. Shutemov <kirill@shutemov.name>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/powerpc/include/asm/tlb.h |    6 ++++++
 mm/mremap.c                    |   15 ++++++++++++++-
 2 files changed, 20 insertions(+), 1 deletion(-)

--- a/arch/powerpc/include/asm/tlb.h~mm-mremap-allow-arch-runtime-override
+++ a/arch/powerpc/include/asm/tlb.h
@@ -83,5 +83,11 @@ static inline int mm_is_thread_local(str
 }
 #endif
 
+#define arch_supports_page_table_move arch_supports_page_table_move
+static inline bool arch_supports_page_table_move(void)
+{
+	return radix_enabled();
+}
+
 #endif /* __KERNEL__ */
 #endif /* __ASM_POWERPC_TLB_H */
--- a/mm/mremap.c~mm-mremap-allow-arch-runtime-override
+++ a/mm/mremap.c
@@ -25,7 +25,7 @@
 #include <linux/userfaultfd_k.h>
 
 #include <asm/cacheflush.h>
-#include <asm/tlbflush.h>
+#include <asm/tlb.h>
 
 #include "internal.h"
 
@@ -209,6 +209,15 @@ static void move_ptes(struct vm_area_str
 		drop_rmap_locks(vma);
 }
 
+#ifndef arch_supports_page_table_move
+#define arch_supports_page_table_move arch_supports_page_table_move
+static inline bool arch_supports_page_table_move(void)
+{
+	return IS_ENABLED(CONFIG_HAVE_MOVE_PMD) ||
+		IS_ENABLED(CONFIG_HAVE_MOVE_PUD);
+}
+#endif
+
 #ifdef CONFIG_HAVE_MOVE_PMD
 static bool move_normal_pmd(struct vm_area_struct *vma, unsigned long old_addr,
 		  unsigned long new_addr, pmd_t *old_pmd, pmd_t *new_pmd)
@@ -217,6 +226,8 @@ static bool move_normal_pmd(struct vm_ar
 	struct mm_struct *mm = vma->vm_mm;
 	pmd_t pmd;
 
+	if (!arch_supports_page_table_move())
+		return false;
 	/*
 	 * The destination pmd shouldn't be established, free_pgtables()
 	 * should have released it.
@@ -284,6 +295,8 @@ static bool move_normal_pud(struct vm_ar
 	struct mm_struct *mm = vma->vm_mm;
 	pud_t pud;
 
+	if (!arch_supports_page_table_move())
+		return false;
 	/*
 	 * The destination pud shouldn't be established, free_pgtables()
 	 * should have released it.
_

Patches currently in -mm which might be from aneesh.kumar@linux.ibm.com are

powerpc-book3s64-mm-update-flush_tlb_range-to-flush-page-walk-cache.patch
powerpc-mm-enable-have_move_pmd-support.patch


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