diff options
Diffstat (limited to 'arch/x86/mm')
| -rw-r--r-- | arch/x86/mm/pageattr.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index a629cea5e46..f60b93dc2e5 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -405,8 +405,18 @@ static int __change_page_attr_set_clr(unsigned long addr, int numpages, static int change_page_attr_set_clr(unsigned long addr, int numpages, pgprot_t mask_set, pgprot_t mask_clr) { - int ret = __change_page_attr_set_clr(addr, numpages, mask_set, - mask_clr); + int ret; + + /* + * Check, if we are requested to change a not supported + * feature: + */ + mask_set = canon_pgprot(mask_set); + mask_clr = canon_pgprot(mask_clr); + if (!pgprot_val(mask_set) && !pgprot_val(mask_clr)) + return 0; + + ret = __change_page_attr_set_clr(addr, numpages, mask_set, mask_clr); /* * On success we use clflush, when the CPU supports it to |