diff options
| author | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:34:01 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:34:01 +0100 |
| commit | 34eff1d75b26eac5c04f9c5b52ba9e3bf1dd8877 (patch) | |
| tree | f295a70be2df45f35cff4e3e36264a2d6a56d896 /arch/x86/mm/pageattr_64.c | |
| parent | b65e6390fb99ca93877ffc1c84e93c857f32dafc (diff) | |
x86: simplify __change_page_attr()
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/mm/pageattr_64.c')
| -rw-r--r-- | arch/x86/mm/pageattr_64.c | 47 |
1 files changed, 18 insertions, 29 deletions
diff --git a/arch/x86/mm/pageattr_64.c b/arch/x86/mm/pageattr_64.c index cbded8300e3..5eff244c16d 100644 --- a/arch/x86/mm/pageattr_64.c +++ b/arch/x86/mm/pageattr_64.c @@ -67,8 +67,7 @@ split_large_page(unsigned long address, pgprot_t ref_prot) } static int -__change_page_attr(unsigned long address, unsigned long pfn, pgprot_t prot, - pgprot_t ref_prot) +__change_page_attr(unsigned long address, unsigned long pfn, pgprot_t prot) { struct page *kpte_page; pte_t *kpte; @@ -84,32 +83,24 @@ repeat: oldprot = pte_pgprot(*kpte); BUG_ON(PageLRU(kpte_page)); BUG_ON(PageCompound(kpte_page)); - ref_prot = canon_pgprot(ref_prot); prot = canon_pgprot(prot); - if (pgprot_val(prot) != pgprot_val(ref_prot)) { - if (level == 4) { - set_pte(kpte, pfn_pte(pfn, prot)); - } else { - /* - * split_large_page will take the reference for this - * change_page_attr on the split page. - */ - struct page *split; - - ref_prot2 = pte_pgprot(pte_clrhuge(*kpte)); - split = split_large_page(address, ref_prot2); - if (!split) - return -ENOMEM; - pgprot_val(ref_prot2) &= ~_PAGE_NX; - set_pte(kpte, mk_pte(split, ref_prot2)); - goto repeat; - } + if (level == 4) { + set_pte(kpte, pfn_pte(pfn, prot)); } else { - if (level == 4) { - set_pte(kpte, pfn_pte(pfn, ref_prot)); - } else - BUG(); + /* + * split_large_page will take the reference for this + * change_page_attr on the split page. + */ + struct page *split; + + ref_prot2 = pte_pgprot(pte_clrhuge(*kpte)); + split = split_large_page(address, ref_prot2); + if (!split) + return -ENOMEM; + pgprot_val(ref_prot2) &= ~_PAGE_NX; + set_pte(kpte, mk_pte(split, ref_prot2)); + goto repeat; } return 0; @@ -144,8 +135,7 @@ int change_page_attr_addr(unsigned long address, int numpages, pgprot_t prot) unsigned long pfn = __pa(address) >> PAGE_SHIFT; if (!kernel_map || pte_present(pfn_pte(0, prot))) { - err = __change_page_attr(address, pfn, prot, - PAGE_KERNEL); + err = __change_page_attr(address, pfn, prot); if (err) break; } @@ -158,8 +148,7 @@ int change_page_attr_addr(unsigned long address, int numpages, pgprot_t prot) addr2 = __START_KERNEL_map + __pa(address); /* Make sure the kernel mappings stay executable */ prot2 = pte_pgprot(pte_mkexec(pfn_pte(0, prot))); - err = __change_page_attr(addr2, pfn, prot2, - PAGE_KERNEL_EXEC); + err = __change_page_attr(addr2, pfn, prot2); } } up_write(&init_mm.mmap_sem); |