xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[S390] s390: use change recording override for kernel mapping

Browse Source 
We dont need the dirty bit if a write access is done via the kernel
mapping. In that case SetPageDirty and friends are used anyway, no
need to do that a second time. We can use the change-recording
overide function for the kernel mapping, if available.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Christian Borntraeger
2009-12-07 12:52:11 +01:00
committed by Martin Schwidefsky
parent a968cd3ef1
commit 6a985c6194
2 changed files with 11 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
arch/s390/mm/vmem.c
View File

@@ -70,8 +70,12 @@ static pte_t __ref *vmem_pte_alloc(void)
pte = alloc_bootmem(PTRS_PER_PTE * sizeof(pte_t));
if (!pte)
return NULL;
clear_table((unsigned long *) pte, _PAGE_TYPE_EMPTY,
PTRS_PER_PTE * sizeof(pte_t));
if (MACHINE_HAS_HPAGE)
clear_table((unsigned long *) pte, _PAGE_TYPE_EMPTY | _PAGE_CO,
PTRS_PER_PTE * sizeof(pte_t));
else
clear_table((unsigned long *) pte, _PAGE_TYPE_EMPTY,
PTRS_PER_PTE * sizeof(pte_t));
return pte;
}
@@ -112,7 +116,8 @@ static int vmem_add_mem(unsigned long start, unsigned long size, int ro)
if (MACHINE_HAS_HPAGE && !(address & ~HPAGE_MASK) &&
(address + HPAGE_SIZE <= start + size) &&
(address >= HPAGE_SIZE)) {
pte_val(pte) |= _SEGMENT_ENTRY_LARGE;
pte_val(pte) |= _SEGMENT_ENTRY_LARGE |
_SEGMENT_ENTRY_CO;
pmd_val(*pm_dir) = pte_val(pte);
address += HPAGE_SIZE - PAGE_SIZE;
continue;