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[PATCH] mm: zap_pte out of line 

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 <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 2005-10-29 18:16:17 -07:00 committed by Linus Torvalds
parent d0de32d9b7
commit 861f2fb8e7
1 changed files with 9 additions and 10 deletions
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19
mm/fremap.c
View File

@ -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;
}
/*
@ -96,9 +94,9 @@ int install_page(struct mm_struct *mm, struct vm_area_struct *vma,
if (page_mapcount(page) > INT_MAX/2)
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);
@ -145,7 +143,8 @@ int install_file_pte(struct mm_struct *mm, struct vm_area_struct *vma,
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;