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author | Thomas Gleixner <tglx@linutronix.de> | 2008-01-30 13:34:08 +0100 |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:34:08 +0100 |
commit | ff31452b6ea5032f26f16140d45dc6596260cd9c (patch) | |
tree | b18035ad80e0286737490fdac2f037e1451c92a7 | |
parent | 72932c7ad2cc309b0ba6149aa31faa26aaee54d5 (diff) | |
download | kernel_samsung_smdk4412-ff31452b6ea5032f26f16140d45dc6596260cd9c.zip kernel_samsung_smdk4412-ff31452b6ea5032f26f16140d45dc6596260cd9c.tar.gz kernel_samsung_smdk4412-ff31452b6ea5032f26f16140d45dc6596260cd9c.tar.bz2 |
x86: cpa create set_and_clr function
Create a set_and_clr function to avoid the duplicate loops. Allows
also to do combined operations for optimization.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r-- | arch/x86/mm/pageattr.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index 55f5b5c..c54832b 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -282,6 +282,45 @@ static int change_page_attr_addr(unsigned long address, pgprot_t prot) return err; } +static int __change_page_attr_set_clr(unsigned long addr, int numpages, + pgprot_t mask_set, pgprot_t mask_clr) +{ + pgprot_t new_prot; + int level; + pte_t *pte; + int i, ret; + + for (i = 0; i < numpages ; i++) { + + pte = lookup_address(addr, &level); + if (!pte) + return -EINVAL; + + new_prot = pte_pgprot(*pte); + + pgprot_val(new_prot) &= ~pgprot_val(mask_clr); + pgprot_val(new_prot) |= pgprot_val(mask_set); + + ret = change_page_attr_addr(addr, new_prot); + if (ret) + return ret; + addr += PAGE_SIZE; + } + + return 0; +} + +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); + + global_flush_tlb(); + + return ret; +} + /** * change_page_attr_set - Change page table attributes in the linear mapping. * @addr: Virtual address in linear mapping. |