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author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-26 09:47:28 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-26 09:47:28 -0800 |
commit | 810ee58de26c9c1255d716b1db7344c4a1093fec (patch) | |
tree | 176531e4e4989ec7a8996a356b1a79ae7b647568 /arch/x86/mm/pageattr.c | |
parent | 2927fceafc91afe744e0d1d33f8bbf98c42668fc (diff) | |
parent | e88a0faae5baaaa3bdc6f23a55ad6bc7a7b4aa77 (diff) |
Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (29 commits)
xen: unitialised return value in xenbus_write_transaction
x86: fix section mismatch warning
x86: unmask CPUID levels on Intel CPUs, fix
x86: work around PAGE_KERNEL_WC not getting WC in iomap_atomic_prot_pfn.
x86: use standard PIT frequency
xen: handle highmem pages correctly when shrinking a domain
x86, mm: fix pte_free()
xen: actually release memory when shrinking domain
x86: unmask CPUID levels on Intel CPUs
x86: add MSR_IA32_MISC_ENABLE bits to <asm/msr-index.h>
x86: fix PTE corruption issue while mapping RAM using /dev/mem
x86: mtrr fix debug boot parameter
x86: fix page attribute corruption with cpa()
Revert "x86: signal: change type of paramter for sys_rt_sigreturn()"
x86: use early clobbers in usercopy*.c
x86: remove kernel_physical_mapping_init() from init section
fix: crash: IP: __bitmap_intersects+0x48/0x73
cpufreq: use work_on_cpu in acpi-cpufreq.c for drv_read and drv_write
work_on_cpu: Use our own workqueue.
work_on_cpu: don't try to get_online_cpus() in work_on_cpu.
...
Diffstat (limited to 'arch/x86/mm/pageattr.c')
-rw-r--r-- | arch/x86/mm/pageattr.c | 49 |
1 files changed, 34 insertions, 15 deletions
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index e89d24815f2..84ba74820ad 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -534,6 +534,36 @@ out_unlock: return 0; } +static int __cpa_process_fault(struct cpa_data *cpa, unsigned long vaddr, + int primary) +{ + /* + * Ignore all non primary paths. + */ + if (!primary) + return 0; + + /* + * Ignore the NULL PTE for kernel identity mapping, as it is expected + * to have holes. + * Also set numpages to '1' indicating that we processed cpa req for + * one virtual address page and its pfn. TBD: numpages can be set based + * on the initial value and the level returned by lookup_address(). + */ + if (within(vaddr, PAGE_OFFSET, + PAGE_OFFSET + (max_pfn_mapped << PAGE_SHIFT))) { + cpa->numpages = 1; + cpa->pfn = __pa(vaddr) >> PAGE_SHIFT; + return 0; + } else { + WARN(1, KERN_WARNING "CPA: called for zero pte. " + "vaddr = %lx cpa->vaddr = %lx\n", vaddr, + *cpa->vaddr); + + return -EFAULT; + } +} + static int __change_page_attr(struct cpa_data *cpa, int primary) { unsigned long address; @@ -549,17 +579,11 @@ static int __change_page_attr(struct cpa_data *cpa, int primary) repeat: kpte = lookup_address(address, &level); if (!kpte) - return 0; + return __cpa_process_fault(cpa, address, primary); old_pte = *kpte; - if (!pte_val(old_pte)) { - if (!primary) - return 0; - WARN(1, KERN_WARNING "CPA: called for zero pte. " - "vaddr = %lx cpa->vaddr = %lx\n", address, - *cpa->vaddr); - return -EINVAL; - } + if (!pte_val(old_pte)) + return __cpa_process_fault(cpa, address, primary); if (level == PG_LEVEL_4K) { pte_t new_pte; @@ -657,12 +681,7 @@ static int cpa_process_alias(struct cpa_data *cpa) vaddr = *cpa->vaddr; if (!(within(vaddr, PAGE_OFFSET, - PAGE_OFFSET + (max_low_pfn_mapped << PAGE_SHIFT)) -#ifdef CONFIG_X86_64 - || within(vaddr, PAGE_OFFSET + (1UL<<32), - PAGE_OFFSET + (max_pfn_mapped << PAGE_SHIFT)) -#endif - )) { + PAGE_OFFSET + (max_pfn_mapped << PAGE_SHIFT)))) { alias_cpa = *cpa; temp_cpa_vaddr = (unsigned long) __va(cpa->pfn << PAGE_SHIFT); |