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[PATCH] freepgt: remove MM_VM_SIZE(mm)

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There's only one usage of MM_VM_SIZE(mm) left, and it's a troublesome macro
because mm doesn't contain the (32-bit emulation?) info needed.  But it too is
only needed because we ignore the end from the vma list.

We could make flush_pgtables return that end, or unmap_vmas.  Choose the
latter, since it's a natural fit with unmap_mapping_range_vma needing to know
its restart addr.  This does make more than minimal change, but if unmap_vmas
had returned the end before, this is how we'd have done it, rather than
storing the break_addr in zap_details.

unmap_vmas used to return count of vmas scanned, but that's just debug which
hasn't been useful in a while; and if we want the map_count 0 on exit check
back, it can easily come from the final remove_vm_struct loop.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Hugh Dickins
2005-04-19 13:29:15 -07:00
committed by Linus Torvalds
parent e0da382c92
commit ee39b37b23
6 changed files with 18 additions and 39 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/asm-ia64/processor.h
-8
View File
@@ -42,14 +42,6 @@
*/
#define TASK_SIZE (current->thread.task_size)
/*
* MM_VM_SIZE(mm) gives the maximum address (plus 1) which may contain a mapping for
* address-space MM. Note that with 32-bit tasks, this is still DEFAULT_TASK_SIZE,
* because the kernel may have installed helper-mappings above TASK_SIZE. For example,
* for x86 emulation, the LDT and GDT are mapped above TASK_SIZE.
*/
#define MM_VM_SIZE(mm) DEFAULT_TASK_SIZE
/*
* This decides where the kernel will search for a free chunk of vm
* space during mmap's.
include/asm-ppc64/processor.h
-4
View File
@@ -542,10 +542,6 @@ extern struct task_struct *last_task_used_altivec;
#define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \
TASK_SIZE_USER32 : TASK_SIZE_USER64)
/* We can't actually tell the TASK_SIZE given just the mm, but default
* to the 64-bit case to make sure that enough gets cleaned up. */
#define MM_VM_SIZE(mm) TASK_SIZE_USER64
/* This decides where the kernel will search for a free chunk of vm
* space during mmap's.
*/
include/asm-s390/processor.h
-2
View File
@@ -74,8 +74,6 @@ extern struct task_struct *last_task_used_math;
#endif /* __s390x__ */
#define MM_VM_SIZE(mm) DEFAULT_TASK_SIZE
#define HAVE_ARCH_PICK_MMAP_LAYOUT
typedef struct {
include/linux/mm.h
+2 -7
View File
@@ -37,10 +37,6 @@ extern int sysctl_legacy_va_layout;
#include <asm/processor.h>
#include <asm/atomic.h>
#ifndef MM_VM_SIZE
#define MM_VM_SIZE(mm) ((TASK_SIZE + PGDIR_SIZE - 1) & PGDIR_MASK)
#endif
#define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
/*
@@ -582,13 +578,12 @@ struct zap_details {
pgoff_t first_index; /* Lowest page->index to unmap */
pgoff_t last_index; /* Highest page->index to unmap */
spinlock_t *i_mmap_lock; /* For unmap_mapping_range: */
unsigned long break_addr; /* Where unmap_vmas stopped */
unsigned long truncate_count; /* Compare vm_truncate_count */
};
void zap_page_range(struct vm_area_struct *vma, unsigned long address,
unsigned long zap_page_range(struct vm_area_struct *vma, unsigned long address,
unsigned long size, struct zap_details *);
int unmap_vmas(struct mmu_gather **tlbp, struct mm_struct *mm,
unsigned long unmap_vmas(struct mmu_gather **tlb, struct mm_struct *mm,
struct vm_area_struct *start_vma, unsigned long start_addr,
unsigned long end_addr, unsigned long *nr_accounted,
struct zap_details *);