diff mbox series

[v3,13/13] mm: remove __ARCH_HAS_4LEVEL_HACK and include/asm-generic/4level-fixup.h

Message ID 1572850587-20314-14-git-send-email-rppt@kernel.org (mailing list archive)
State Awaiting Upstream
Headers show
Series mm: remove __ARCH_HAS_4LEVEL_HACK | expand

Commit Message

Mike Rapoport Nov. 4, 2019, 6:56 a.m. UTC 
From: Mike Rapoport <rppt@linux.ibm.com>

There are no architectures that use include/asm-generic/4level-fixup.h
therefore it can be removed along with __ARCH_HAS_4LEVEL_HACK define.

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
---
 include/asm-generic/4level-fixup.h | 40 --------------------------------------
 include/asm-generic/tlb.h          |  2 --
 include/linux/mm.h                 | 10 +++++-----
 mm/memory.c                        |  8 --------
 4 files changed, 5 insertions(+), 55 deletions(-)
 delete mode 100644 include/asm-generic/4level-fixup.h

Comments

Arnd Bergmann Nov. 4, 2019, 9:11 a.m. UTC | #1 
On Mon, Nov 4, 2019 at 7:58 AM Mike Rapoport <rppt@kernel.org> wrote:
>
> From: Mike Rapoport <rppt@linux.ibm.com>
>
> There are no architectures that use include/asm-generic/4level-fixup.h
> therefore it can be removed along with __ARCH_HAS_4LEVEL_HACK define.
>
> Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>

For asm-generic:

Acked-by: Arnd Bergmann <arnd@arndb.de>

Have you discussed how the series should get merged? I assume an initial
set of patches can just go through architecture maintainer trees, but
whatever patches don't get picked up that way would go through either
Andrew's -mm tree (for memory management) or my asm-generic tree
(for cross-architecture cleanups).

Since there is still at least one regression, I expect not to do anything
for now. Please let me know when/if you expect me to merge the
remaining patches.

      Arnd
Mike Rapoport Nov. 4, 2019, 10:02 a.m. UTC | #2 
On Mon, Nov 04, 2019 at 10:11:51AM +0100, Arnd Bergmann wrote:
> On Mon, Nov 4, 2019 at 7:58 AM Mike Rapoport <rppt@kernel.org> wrote:
> >
> > From: Mike Rapoport <rppt@linux.ibm.com>
> >
> > There are no architectures that use include/asm-generic/4level-fixup.h
> > therefore it can be removed along with __ARCH_HAS_4LEVEL_HACK define.
> >
> > Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
> 
> For asm-generic:
> 
> Acked-by: Arnd Bergmann <arnd@arndb.de>
> 
> Have you discussed how the series should get merged? I assume an initial
> set of patches can just go through architecture maintainer trees, but
> whatever patches don't get picked up that way would go through either
> Andrew's -mm tree (for memory management) or my asm-generic tree
> (for cross-architecture cleanups).

I thought that the entire set could go via -mm or asm-generic, but if
architecture maintainers would prefer to pick relevant patches to the arch
trees, I'll resend the rest afterwards.
 
> Since there is still at least one regression, I expect not to do anything
> for now. Please let me know when/if you expect me to merge the
> remaining patches.

Sure, thanks!

>       Arnd
diff mbox series

Patch

diff --git a/include/asm-generic/4level-fixup.h b/include/asm-generic/4level-fixup.h
deleted file mode 100644
index e3667c9..0000000
--- a/include/asm-generic/4level-fixup.h
+++ /dev/null
@@ -1,40 +0,0 @@ 
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _4LEVEL_FIXUP_H
-#define _4LEVEL_FIXUP_H
-
-#define __ARCH_HAS_4LEVEL_HACK
-#define __PAGETABLE_PUD_FOLDED 1
-
-#define PUD_SHIFT			PGDIR_SHIFT
-#define PUD_SIZE			PGDIR_SIZE
-#define PUD_MASK			PGDIR_MASK
-#define PTRS_PER_PUD			1
-
-#define pud_t				pgd_t
-
-#define pmd_alloc(mm, pud, address) \
-	((unlikely(pgd_none(*(pud))) && __pmd_alloc(mm, pud, address))? \
- 		NULL: pmd_offset(pud, address))
-
-#define pud_offset(pgd, start)		(pgd)
-#define pud_none(pud)			0
-#define pud_bad(pud)			0
-#define pud_present(pud)		1
-#define pud_ERROR(pud)			do { } while (0)
-#define pud_clear(pud)			pgd_clear(pud)
-#define pud_val(pud)			pgd_val(pud)
-#define pud_populate(mm, pud, pmd)	pgd_populate(mm, pud, pmd)
-#define pud_page(pud)			pgd_page(pud)
-#define pud_page_vaddr(pud)		pgd_page_vaddr(pud)
-
-#undef pud_free_tlb
-#define pud_free_tlb(tlb, x, addr)	do { } while (0)
-#define pud_free(mm, x)			do { } while (0)
-#define __pud_free_tlb(tlb, x, addr)	do { } while (0)
-
-#undef  pud_addr_end
-#define pud_addr_end(addr, end)		(end)
-
-#include <asm-generic/5level-fixup.h>
-
-#endif
diff --git a/include/asm-generic/tlb.h b/include/asm-generic/tlb.h
index 04c0644..5e0c2d0 100644
--- a/include/asm-generic/tlb.h
+++ b/include/asm-generic/tlb.h
@@ -584,7 +584,6 @@  static inline void tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vm
 	} while (0)
 #endif
 
-#ifndef __ARCH_HAS_4LEVEL_HACK
 #ifndef pud_free_tlb
 #define pud_free_tlb(tlb, pudp, address)			\
 	do {							\
@@ -594,7 +593,6 @@  static inline void tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vm
 		__pud_free_tlb(tlb, pudp, address);		\
 	} while (0)
 #endif
-#endif
 
 #ifndef __ARCH_HAS_5LEVEL_HACK
 #ifndef p4d_free_tlb
diff --git a/include/linux/mm.h b/include/linux/mm.h
index cc29227..477b52a 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1850,12 +1850,12 @@  static inline void mm_dec_nr_ptes(struct mm_struct *mm) {}
 int __pte_alloc(struct mm_struct *mm, pmd_t *pmd);
 int __pte_alloc_kernel(pmd_t *pmd);
 
+#if defined(CONFIG_MMU)
+
 /*
- * The following ifdef needed to get the 4level-fixup.h header to work.
- * Remove it when 4level-fixup.h has been removed.
+ * The following ifdef needed to get the 5level-fixup.h header to work.
+ * Remove it when 5level-fixup.h has been removed.
  */
-#if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
-
 #ifndef __ARCH_HAS_5LEVEL_HACK
 static inline p4d_t *p4d_alloc(struct mm_struct *mm, pgd_t *pgd,
 		unsigned long address)
@@ -1877,7 +1877,7 @@  static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long a
 	return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))?
 		NULL: pmd_offset(pud, address);
 }
-#endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
+#endif /* CONFIG_MMU */
 
 #if USE_SPLIT_PTE_PTLOCKS
 #if ALLOC_SPLIT_PTLOCKS
diff --git a/mm/memory.c b/mm/memory.c
index b1ca51a..50300f0 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4095,19 +4095,11 @@  int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)
 	smp_wmb(); /* See comment in __pte_alloc */
 
 	ptl = pud_lock(mm, pud);
-#ifndef __ARCH_HAS_4LEVEL_HACK
 	if (!pud_present(*pud)) {
 		mm_inc_nr_pmds(mm);
 		pud_populate(mm, pud, new);
 	} else	/* Another has populated it */
 		pmd_free(mm, new);
-#else
-	if (!pgd_present(*pud)) {
-		mm_inc_nr_pmds(mm);
-		pgd_populate(mm, pud, new);
-	} else /* Another has populated it */
-		pmd_free(mm, new);
-#endif /* __ARCH_HAS_4LEVEL_HACK */
 	spin_unlock(ptl);
 	return 0;
 }