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powerpc/nohash: fix hash related comments in pgtable.h 

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy 2018-07-05 16:25:11 +00:00 committed by Michael Ellerman
parent 62b8426578
commit 0c295d0e9c
2 changed files with 4 additions and 18 deletions
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4
arch/powerpc/include/asm/nohash/32/pgtable.h
View File

@ -223,10 +223,6 @@ static inline unsigned long long pte_update(pte_t *p,
}
#endif /* CONFIG_PTE_64BIT */
/*
* 2.6 calls this without flushing the TLB entry; this is wrong
* for our hash-based implementation, we fix that up here.
*/
#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
static inline int __ptep_test_and_clear_young(unsigned int context, unsigned long addr, pte_t *ptep)
{

18
arch/powerpc/include/asm/nohash/64/pgtable.h
View File

@ -3,7 +3,7 @@
#define _ASM_POWERPC_NOHASH_64_PGTABLE_H
/*
* This file contains the functions and defines necessary to modify and use
* the ppc64 hashed page table.
* the ppc64 non-hashed page table.
*/
#include <asm/nohash/64/pgtable-4k.h>
@ -38,7 +38,7 @@
/*
* The vmalloc space starts at the beginning of that region, and
* occupies half of it on hash CPUs and a quarter of it on Book3E
* occupies a quarter of it on Book3E
* (we keep a quarter for the virtual memmap)
*/
#define VMALLOC_START KERN_VIRT_START
@ -78,7 +78,7 @@
/*
* Defines the address of the vmemap area, in its own region on
* hash table CPUs and after the vmalloc space on Book3E
* after the vmalloc space on Book3E
*/
#define VMEMMAP_BASE VMALLOC_END
#define VMEMMAP_END KERN_IO_START
@ -248,14 +248,6 @@ static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
pte_update(mm, addr, ptep, _PAGE_RW, 0, 1);
}
/*
* We currently remove entries from the hashtable regardless of whether
* the entry was young or dirty. The generic routines only flush if the
* entry was young or dirty which is not good enough.
*
* We should be more intelligent about this but for the moment we override
* these functions and force a tlb flush unconditionally
*/
#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
#define ptep_clear_flush_young(__vma, __address, __ptep) \
({ \
@ -279,9 +271,7 @@ static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
}
/* Set the dirty and/or accessed bits atomically in a linux PTE, this
* function doesn't need to flush the hash entry
*/
/* Set the dirty and/or accessed bits atomically in a linux PTE */
static inline void __ptep_set_access_flags(struct vm_area_struct *vma,
pte_t *ptep, pte_t entry,
unsigned long address,