diff options
| author | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:34:03 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:34:03 +0100 |
| commit | 674d67269e79f6697c3480363b28c9b9934fa60c (patch) | |
| tree | fd7c3eff64e9f9a55556c99261d9b709b9125a55 /arch | |
| parent | 6faa4c53b2f06fd271060761ce27f4f53289175c (diff) | |
x86: clean up differences between 64-bit and 32-bit
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/mm/pageattr_64.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/arch/x86/mm/pageattr_64.c b/arch/x86/mm/pageattr_64.c index 139795029fb..60cfb687f97 100644 --- a/arch/x86/mm/pageattr_64.c +++ b/arch/x86/mm/pageattr_64.c @@ -126,30 +126,36 @@ out_unlock: static int __change_page_attr(unsigned long address, struct page *page, pgprot_t prot) { - pgprot_t ref_prot2, oldprot; struct page *kpte_page; int level, err = 0; pte_t *kpte; + BUG_ON(PageHighMem(page)); + repeat: kpte = lookup_address(address, &level); if (!kpte) return 0; kpte_page = virt_to_page(kpte); - oldprot = pte_pgprot(*kpte); BUG_ON(PageLRU(kpte_page)); BUG_ON(PageCompound(kpte_page)); - prot = canon_pgprot(prot); + + /* + * Better fail early if someone sets the kernel text to NX. + * Does not cover __inittext + */ + BUG_ON(address >= (unsigned long)&_text && + address < (unsigned long)&_etext && + (pgprot_val(prot) & _PAGE_NX)); if (level == 4) { - set_pte_atomic(kpte, mk_pte(page, prot)); + set_pte_atomic(kpte, mk_pte(page, canon_pgprot(prot))); } else { err = split_large_page(kpte, address); if (!err) goto repeat; } - return err; } |