There used to be just one call to zap_pte, but it shouldn't be inline
now there are two. Check for the common case pte_none before calling,
and move its rss accounting up into install_page or install_file_pte -
which helps the next patch.
Signed-off-by: Hugh Dickins <[email protected]>
---
mm/fremap.c | 19 +++++++++----------
1 files changed, 9 insertions(+), 10 deletions(-)
--- mm04/mm/fremap.c 2005-10-11 12:16:50.000000000 +0100
+++ mm05/mm/fremap.c 2005-10-11 23:54:15.000000000 +0100
@@ -20,34 +20,32 @@
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
-static inline void zap_pte(struct mm_struct *mm, struct vm_area_struct *vma,
+static int zap_pte(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep)
{
pte_t pte = *ptep;
+ struct page *page = NULL;
- if (pte_none(pte))
- return;
if (pte_present(pte)) {
unsigned long pfn = pte_pfn(pte);
- struct page *page;
-
flush_cache_page(vma, addr, pfn);
pte = ptep_clear_flush(vma, addr, ptep);
if (unlikely(!pfn_valid(pfn))) {
print_bad_pte(vma, pte, addr);
- return;
+ goto out;
}
page = pfn_to_page(pfn);
if (pte_dirty(pte))
set_page_dirty(page);
page_remove_rmap(page);
page_cache_release(page);
- dec_mm_counter(mm, file_rss);
} else {
if (!pte_file(pte))
free_swap_and_cache(pte_to_swp_entry(pte));
pte_clear(mm, addr, ptep);
}
+out:
+ return !!page;
}
/*
@@ -93,9 +91,9 @@ int install_page(struct mm_struct *mm, s
if (!page->mapping || page->index >= size)
goto err_unlock;
- zap_pte(mm, vma, addr, pte);
+ if (pte_none(*pte) || !zap_pte(mm, vma, addr, pte))
+ inc_mm_counter(mm, file_rss);
- inc_mm_counter(mm, file_rss);
flush_icache_page(vma, page);
set_pte_at(mm, addr, pte, mk_pte(page, prot));
page_add_file_rmap(page);
@@ -142,7 +140,8 @@ int install_file_pte(struct mm_struct *m
if (!pte)
goto err_unlock;
- zap_pte(mm, vma, addr, pte);
+ if (!pte_none(*pte) && zap_pte(mm, vma, addr, pte))
+ dec_mm_counter(mm, file_rss);
set_pte_at(mm, addr, pte, pgoff_to_pte(pgoff));
pte_val = *pte;
-
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