[S390] s390: use change recording override for kernel mapping (6a985c61) · Commits · 戴 / test

arch/s390/include/asm/pgtable.h

+3 −1

Original line number	Diff line number	Diff line
		@@ -169,12 +169,13 @@ extern unsigned long VMALLOC_START;
		* STL Segment-Table-Length: Segment-table length (STL+1*16 entries -> up to 2048)
		*
		* A 64 bit pagetable entry of S390 has following format:
		* \| PFRA \|0IP0\| OS \|
		* \| PFRA \|0IPC\| OS \|
		* 0000000000111111111122222222223333333333444444444455555555556666
		* 0123456789012345678901234567890123456789012345678901234567890123
		*
		* I Page-Invalid Bit: Page is not available for address-translation
		* P Page-Protection Bit: Store access not possible for page
		* C Change-bit override: HW is not required to set change bit
		*
		* A 64 bit segmenttable entry of S390 has following format:
		* \| P-table origin \| TT
		@@ -218,6 +219,7 @@ extern unsigned long VMALLOC_START;
		*/

		/* Hardware bits in the page table entry */
		#define _PAGE_CO 0x100 /* HW Change-bit override */
		#define _PAGE_RO 0x200 /* HW read-only bit */
		#define _PAGE_INVALID 0x400 /* HW invalid bit */

+8 −3

Original line number	Diff line number	Diff line
		@@ -70,6 +70,10 @@ static pte_t __ref *vmem_pte_alloc(void)
		pte = alloc_bootmem(PTRS_PER_PTE * sizeof(pte_t));
		if (!pte)
		return NULL;
		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;