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Date: Thu, 21 Jun 2012 17:57:15 -0400
From: Rik van Riel <riel@...riel.com>
To: linux-mm@...ck.org
Cc: akpm@...ux-foundation.org, aarcange@...hat.com,
peterz@...radead.org, minchan@...il.com, kosaki.motohiro@...il.com,
andi@...stfloor.org, hannes@...xchg.org, mel@....ul.ie,
linux-kernel@...r.kernel.org, Rik van Riel <riel@...riel.com>,
Rik van Riel <riel@...hat.com>,
Paul Mundt <lethal@...ux-sh.org>,
Magnus Damm <magnus.damm@...il.com>, linux-sh@...r.kernel.org
Subject: [PATCH -mm v2 11/11] mm: remove SH arch_get_unmapped_area functions
Remove the SH special variants of arch_get_unmapped_area since
the generic functions should now be able to handle everything.
Paul, does anything in NOMMU SH need shm_align_mask?
Untested because I have no SH hardware.
Signed-off-by: Rik van Riel <riel@...hat.com>
Cc: Paul Mundt <lethal@...ux-sh.org>
Cc: Magnus Damm <magnus.damm@...il.com>
Cc: linux-sh@...r.kernel.org
---
arch/sh/include/asm/pgtable.h | 4 -
arch/sh/mm/mmap.c | 219 +----------------------------------------
2 files changed, 2 insertions(+), 221 deletions(-)
diff --git a/arch/sh/include/asm/pgtable.h b/arch/sh/include/asm/pgtable.h
index 9210e93..03f5312 100644
--- a/arch/sh/include/asm/pgtable.h
+++ b/arch/sh/include/asm/pgtable.h
@@ -155,10 +155,6 @@ extern void paging_init(void);
extern void page_table_range_init(unsigned long start, unsigned long end,
pgd_t *pgd);
-/* arch/sh/mm/mmap.c */
-#define HAVE_ARCH_UNMAPPED_AREA
-#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
-
#define __HAVE_ARCH_PTE_SPECIAL
#include <asm-generic/pgtable.h>
diff --git a/arch/sh/mm/mmap.c b/arch/sh/mm/mmap.c
index afeb710..12f5edd 100644
--- a/arch/sh/mm/mmap.c
+++ b/arch/sh/mm/mmap.c
@@ -14,225 +14,10 @@
#include <asm/page.h>
#include <asm/processor.h>
+#ifndef CONFIG_MMU
unsigned long shm_align_mask = PAGE_SIZE - 1; /* Sane caches */
EXPORT_SYMBOL(shm_align_mask);
-
-#ifdef CONFIG_MMU
-/*
- * To avoid cache aliases, we map the shared page with same color.
- */
-static inline unsigned long COLOUR_ALIGN(unsigned long addr,
- unsigned long pgoff)
-{
- unsigned long base = (addr + shm_align_mask) & ~shm_align_mask;
- unsigned long off = (pgoff << PAGE_SHIFT) & shm_align_mask;
-
- return base + off;
-}
-
-static inline unsigned long COLOUR_ALIGN_DOWN(unsigned long addr,
- unsigned long pgoff)
-{
- unsigned long base = addr & ~shm_align_mask;
- unsigned long off = (pgoff << PAGE_SHIFT) & shm_align_mask;
-
- if (base + off <= addr)
- return base + off;
-
- return base - off;
-}
-
-unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
- unsigned long len, unsigned long pgoff, unsigned long flags)
-{
- struct mm_struct *mm = current->mm;
- struct vm_area_struct *vma;
- unsigned long start_addr;
- int do_colour_align;
-
- if (flags & MAP_FIXED) {
- /* We do not accept a shared mapping if it would violate
- * cache aliasing constraints.
- */
- if ((flags & MAP_SHARED) &&
- ((addr - (pgoff << PAGE_SHIFT)) & shm_align_mask))
- return -EINVAL;
- return addr;
- }
-
- if (unlikely(len > TASK_SIZE))
- return -ENOMEM;
-
- do_colour_align = 0;
- if (filp || (flags & MAP_SHARED))
- do_colour_align = 1;
-
- if (addr) {
- if (do_colour_align)
- addr = COLOUR_ALIGN(addr, pgoff);
- else
- addr = PAGE_ALIGN(addr);
-
- vma = find_vma(mm, addr);
- if (TASK_SIZE - len >= addr &&
- (!vma || addr + len <= vma->vm_start))
- return addr;
- }
-
- if (len > mm->cached_hole_size) {
- start_addr = addr = mm->free_area_cache;
- } else {
- mm->cached_hole_size = 0;
- start_addr = addr = TASK_UNMAPPED_BASE;
- }
-
-full_search:
- if (do_colour_align)
- addr = COLOUR_ALIGN(addr, pgoff);
- else
- addr = PAGE_ALIGN(mm->free_area_cache);
-
- for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
- /* At this point: (!vma || addr < vma->vm_end). */
- if (unlikely(TASK_SIZE - len < addr)) {
- /*
- * Start a new search - just in case we missed
- * some holes.
- */
- if (start_addr != TASK_UNMAPPED_BASE) {
- start_addr = addr = TASK_UNMAPPED_BASE;
- mm->cached_hole_size = 0;
- goto full_search;
- }
- return -ENOMEM;
- }
- if (likely(!vma || addr + len <= vma->vm_start)) {
- /*
- * Remember the place where we stopped the search:
- */
- mm->free_area_cache = addr + len;
- return addr;
- }
- if (addr + mm->cached_hole_size < vma->vm_start)
- mm->cached_hole_size = vma->vm_start - addr;
-
- addr = vma->vm_end;
- if (do_colour_align)
- addr = COLOUR_ALIGN(addr, pgoff);
- }
-}
-
-unsigned long
-arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
- const unsigned long len, const unsigned long pgoff,
- const unsigned long flags)
-{
- struct vm_area_struct *vma;
- struct mm_struct *mm = current->mm;
- unsigned long addr = addr0;
- int do_colour_align;
-
- if (flags & MAP_FIXED) {
- /* We do not accept a shared mapping if it would violate
- * cache aliasing constraints.
- */
- if ((flags & MAP_SHARED) &&
- ((addr - (pgoff << PAGE_SHIFT)) & shm_align_mask))
- return -EINVAL;
- return addr;
- }
-
- if (unlikely(len > TASK_SIZE))
- return -ENOMEM;
-
- do_colour_align = 0;
- if (filp || (flags & MAP_SHARED))
- do_colour_align = 1;
-
- /* requesting a specific address */
- if (addr) {
- if (do_colour_align)
- addr = COLOUR_ALIGN(addr, pgoff);
- else
- addr = PAGE_ALIGN(addr);
-
- vma = find_vma(mm, addr);
- if (TASK_SIZE - len >= addr &&
- (!vma || addr + len <= vma->vm_start))
- return addr;
- }
-
- /* check if free_area_cache is useful for us */
- if (len <= mm->cached_hole_size) {
- mm->cached_hole_size = 0;
- mm->free_area_cache = mm->mmap_base;
- }
-
- /* either no address requested or can't fit in requested address hole */
- addr = mm->free_area_cache;
- if (do_colour_align) {
- unsigned long base = COLOUR_ALIGN_DOWN(addr-len, pgoff);
-
- addr = base + len;
- }
-
- /* make sure it can fit in the remaining address space */
- if (likely(addr > len)) {
- vma = find_vma(mm, addr-len);
- if (!vma || addr <= vma->vm_start) {
- /* remember the address as a hint for next time */
- return (mm->free_area_cache = addr-len);
- }
- }
-
- if (unlikely(mm->mmap_base < len))
- goto bottomup;
-
- addr = mm->mmap_base-len;
- if (do_colour_align)
- addr = COLOUR_ALIGN_DOWN(addr, pgoff);
-
- do {
- /*
- * Lookup failure means no vma is above this address,
- * else if new region fits below vma->vm_start,
- * return with success:
- */
- vma = find_vma(mm, addr);
- if (likely(!vma || addr+len <= vma->vm_start)) {
- /* remember the address as a hint for next time */
- return (mm->free_area_cache = addr);
- }
-
- /* remember the largest hole we saw so far */
- if (addr + mm->cached_hole_size < vma->vm_start)
- mm->cached_hole_size = vma->vm_start - addr;
-
- /* try just below the current vma->vm_start */
- addr = vma->vm_start-len;
- if (do_colour_align)
- addr = COLOUR_ALIGN_DOWN(addr, pgoff);
- } while (likely(len < vma->vm_start));
-
-bottomup:
- /*
- * A failed mmap() very likely causes application failure,
- * so fall back to the bottom-up function here. This scenario
- * can happen with large stack limits and large mmap()
- * allocations.
- */
- mm->cached_hole_size = ~0UL;
- mm->free_area_cache = TASK_UNMAPPED_BASE;
- addr = arch_get_unmapped_area(filp, addr0, len, pgoff, flags);
- /*
- * Restore the topdown base:
- */
- mm->free_area_cache = mm->mmap_base;
- mm->cached_hole_size = ~0UL;
-
- return addr;
-}
-#endif /* CONFIG_MMU */
+#endif
/*
* You really shouldn't be using read() or write() on /dev/mem. This
--
1.7.7.6
--
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