aboutsummaryrefslogtreecommitdiff
path: root/arch/s390/mm
diff options
context:
space:
mode:
Diffstat (limited to 'arch/s390/mm')
-rw-r--r--arch/s390/mm/cmm.c30
-rw-r--r--arch/s390/mm/fault.c40
-rw-r--r--arch/s390/mm/init.c36
3 files changed, 60 insertions, 46 deletions
diff --git a/arch/s390/mm/cmm.c b/arch/s390/mm/cmm.c
index ceea51cff03..786a44dba5b 100644
--- a/arch/s390/mm/cmm.c
+++ b/arch/s390/mm/cmm.c
@@ -53,22 +53,6 @@ static void cmm_timer_fn(unsigned long);
static void cmm_set_timer(void);
static long
-cmm_strtoul(const char *cp, char **endp)
-{
- unsigned int base = 10;
-
- if (*cp == '0') {
- base = 8;
- cp++;
- if ((*cp == 'x' || *cp == 'X') && isxdigit(cp[1])) {
- base = 16;
- cp++;
- }
- }
- return simple_strtoul(cp, endp, base);
-}
-
-static long
cmm_alloc_pages(long pages, long *counter, struct cmm_page_array **list)
{
struct cmm_page_array *pa;
@@ -276,7 +260,7 @@ cmm_pages_handler(ctl_table *ctl, int write, struct file *filp,
return -EFAULT;
buf[sizeof(buf) - 1] = '\0';
cmm_skip_blanks(buf, &p);
- pages = cmm_strtoul(p, &p);
+ pages = simple_strtoul(p, &p, 0);
if (ctl == &cmm_table[0])
cmm_set_pages(pages);
else
@@ -317,9 +301,9 @@ cmm_timeout_handler(ctl_table *ctl, int write, struct file *filp,
return -EFAULT;
buf[sizeof(buf) - 1] = '\0';
cmm_skip_blanks(buf, &p);
- pages = cmm_strtoul(p, &p);
+ pages = simple_strtoul(p, &p, 0);
cmm_skip_blanks(p, &p);
- seconds = cmm_strtoul(p, &p);
+ seconds = simple_strtoul(p, &p, 0);
cmm_set_timeout(pages, seconds);
} else {
len = sprintf(buf, "%ld %ld\n",
@@ -382,24 +366,24 @@ cmm_smsg_target(char *from, char *msg)
if (strncmp(msg, "SHRINK", 6) == 0) {
if (!cmm_skip_blanks(msg + 6, &msg))
return;
- pages = cmm_strtoul(msg, &msg);
+ pages = simple_strtoul(msg, &msg, 0);
cmm_skip_blanks(msg, &msg);
if (*msg == '\0')
cmm_set_pages(pages);
} else if (strncmp(msg, "RELEASE", 7) == 0) {
if (!cmm_skip_blanks(msg + 7, &msg))
return;
- pages = cmm_strtoul(msg, &msg);
+ pages = simple_strtoul(msg, &msg, 0);
cmm_skip_blanks(msg, &msg);
if (*msg == '\0')
cmm_add_timed_pages(pages);
} else if (strncmp(msg, "REUSE", 5) == 0) {
if (!cmm_skip_blanks(msg + 5, &msg))
return;
- pages = cmm_strtoul(msg, &msg);
+ pages = simple_strtoul(msg, &msg, 0);
if (!cmm_skip_blanks(msg, &msg))
return;
- seconds = cmm_strtoul(msg, &msg);
+ seconds = simple_strtoul(msg, &msg, 0);
cmm_skip_blanks(msg, &msg);
if (*msg == '\0')
cmm_set_timeout(pages, seconds);
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 7cd82575813..44f0cda7e72 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -25,10 +25,12 @@
#include <linux/console.h>
#include <linux/module.h>
#include <linux/hardirq.h>
+#include <linux/kprobes.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
+#include <asm/kdebug.h>
#ifndef CONFIG_64BIT
#define __FAIL_ADDR_MASK 0x7ffff000
@@ -48,6 +50,38 @@ extern int sysctl_userprocess_debug;
extern void die(const char *,struct pt_regs *,long);
+#ifdef CONFIG_KPROBES
+ATOMIC_NOTIFIER_HEAD(notify_page_fault_chain);
+int register_page_fault_notifier(struct notifier_block *nb)
+{
+ return atomic_notifier_chain_register(&notify_page_fault_chain, nb);
+}
+
+int unregister_page_fault_notifier(struct notifier_block *nb)
+{
+ return atomic_notifier_chain_unregister(&notify_page_fault_chain, nb);
+}
+
+static inline int notify_page_fault(enum die_val val, const char *str,
+ struct pt_regs *regs, long err, int trap, int sig)
+{
+ struct die_args args = {
+ .regs = regs,
+ .str = str,
+ .err = err,
+ .trapnr = trap,
+ .signr = sig
+ };
+ return atomic_notifier_call_chain(&notify_page_fault_chain, val, &args);
+}
+#else
+static inline int notify_page_fault(enum die_val val, const char *str,
+ struct pt_regs *regs, long err, int trap, int sig)
+{
+ return NOTIFY_DONE;
+}
+#endif
+
extern spinlock_t timerlist_lock;
/*
@@ -159,7 +193,7 @@ static void do_sigsegv(struct pt_regs *regs, unsigned long error_code,
* 11 Page translation -> Not present (nullification)
* 3b Region third trans. -> Not present (nullification)
*/
-static inline void
+static inline void __kprobes
do_exception(struct pt_regs *regs, unsigned long error_code, int is_protection)
{
struct task_struct *tsk;
@@ -173,6 +207,10 @@ do_exception(struct pt_regs *regs, unsigned long error_code, int is_protection)
tsk = current;
mm = tsk->mm;
+ if (notify_page_fault(DIE_PAGE_FAULT, "page fault", regs, error_code, 14,
+ SIGSEGV) == NOTIFY_STOP)
+ return;
+
/*
* Check for low-address protection. This needs to be treated
* as a special case because the translation exception code
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 6e6b6de7777..cfd9b8f7a52 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -108,16 +108,23 @@ void __init paging_init(void)
unsigned long pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | _KERNSEG_TABLE;
static const int ssm_mask = 0x04000000L;
unsigned long ro_start_pfn, ro_end_pfn;
+ unsigned long zones_size[MAX_NR_ZONES];
ro_start_pfn = PFN_DOWN((unsigned long)&__start_rodata);
ro_end_pfn = PFN_UP((unsigned long)&__end_rodata);
+ memset(zones_size, 0, sizeof(zones_size));
+ zones_size[ZONE_DMA] = max_low_pfn;
+ free_area_init_node(0, &contig_page_data, zones_size,
+ __pa(PAGE_OFFSET) >> PAGE_SHIFT,
+ zholes_size);
+
/* unmap whole virtual address space */
pg_dir = swapper_pg_dir;
- for (i=0;i<KERNEL_PGD_PTRS;i++)
- pmd_clear((pmd_t*)pg_dir++);
+ for (i = 0; i < PTRS_PER_PGD; i++)
+ pmd_clear((pmd_t *) pg_dir++);
/*
* map whole physical memory to virtual memory (identity mapping)
@@ -131,10 +138,7 @@ void __init paging_init(void)
*/
pg_table = (pte_t *) alloc_bootmem_pages(PAGE_SIZE);
- pg_dir->pgd0 = (_PAGE_TABLE | __pa(pg_table));
- pg_dir->pgd1 = (_PAGE_TABLE | (__pa(pg_table)+1024));
- pg_dir->pgd2 = (_PAGE_TABLE | (__pa(pg_table)+2048));
- pg_dir->pgd3 = (_PAGE_TABLE | (__pa(pg_table)+3072));
+ pmd_populate_kernel(&init_mm, (pmd_t *) pg_dir, pg_table);
pg_dir++;
for (tmp = 0 ; tmp < PTRS_PER_PTE ; tmp++,pg_table++) {
@@ -143,8 +147,8 @@ void __init paging_init(void)
else
pte = pfn_pte(pfn, PAGE_KERNEL);
if (pfn >= max_low_pfn)
- pte_clear(&init_mm, 0, &pte);
- set_pte(pg_table, pte);
+ pte_val(pte) = _PAGE_TYPE_EMPTY;
+ set_pte(pg_table, pte);
pfn++;
}
}
@@ -159,16 +163,6 @@ void __init paging_init(void)
: : "m" (pgdir_k), "m" (ssm_mask));
local_flush_tlb();
-
- {
- unsigned long zones_size[MAX_NR_ZONES];
-
- memset(zones_size, 0, sizeof(zones_size));
- zones_size[ZONE_DMA] = max_low_pfn;
- free_area_init_node(0, &contig_page_data, zones_size,
- __pa(PAGE_OFFSET) >> PAGE_SHIFT,
- zholes_size);
- }
return;
}
@@ -236,10 +230,8 @@ void __init paging_init(void)
pte = pfn_pte(pfn, __pgprot(_PAGE_RO));
else
pte = pfn_pte(pfn, PAGE_KERNEL);
- if (pfn >= max_low_pfn) {
- pte_clear(&init_mm, 0, &pte);
- continue;
- }
+ if (pfn >= max_low_pfn)
+ pte_val(pte) = _PAGE_TYPE_EMPTY;
set_pte(pt_dir, pte);
pfn++;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-18 21:34:28 +0000