s390/crash: move copy_to_user_real() to crash_dump.c

Function copy_to_user_real() does not really belong to maccess.c.
It is only used for copying oldmem to user space, so let's move
it to the friends.

Acked-by: Heiko Carstens <hca@linux.ibm.com>
Tested-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Link: https://lore.kernel.org/r/e8de968d40202d87caa09aef12e9c67ec23a1c1a.1658206891.git.agordeev@linux.ibm.com
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

diff --git a/arch/s390/include/asm/uaccess.h b/arch/s390/include/asm/uaccess.h
index f4511e2..2a06731 100644 (file)
--- a/arch/s390/include/asm/uaccess.h
+++ b/arch/s390/include/asm/uaccess.h
@@ -285,7 +285,6 @@ static inline unsigned long __must_check clear_user(void __user *to, unsigned lo
        return __clear_user(to, n);
 }
 
-int copy_to_user_real(void __user *dest, unsigned long src, unsigned long count);
 void *s390_kernel_write(void *dst, const void *src, size_t size);
 
 int __noreturn __put_kernel_bad(void);

diff --git a/arch/s390/kernel/crash_dump.c b/arch/s390/kernel/crash_dump.c
index 0efee5c..8d7332d 100644 (file)
--- a/arch/s390/kernel/crash_dump.c
+++ b/arch/s390/kernel/crash_dump.c
@@ -174,6 +174,32 @@ int copy_oldmem_kernel(void *dst, unsigned long src, size_t count)
 }
 
 /*
+ * Copy memory from kernel (real) to user (virtual)
+ */
+static int copy_to_user_real(void __user *dest, unsigned long src, unsigned long count)
+{
+       int offs = 0, size, rc;
+       char *buf;
+
+       buf = (char *)__get_free_page(GFP_KERNEL);
+       if (!buf)
+               return -ENOMEM;
+       rc = -EFAULT;
+       while (offs < count) {
+               size = min(PAGE_SIZE, count - offs);
+               if (memcpy_real(buf, src + offs, size))
+                       goto out;
+               if (copy_to_user(dest + offs, buf, size))
+                       goto out;
+               offs += size;
+       }
+       rc = 0;
+out:
+       free_page((unsigned long)buf);
+       return rc;
+}
+
+/*
  * Copy memory of the old, dumped system to a user space virtual address
  */
 static int copy_oldmem_user(void __user *dst, unsigned long src, size_t count)

diff --git a/arch/s390/mm/maccess.c b/arch/s390/mm/maccess.c
index 421efa4..d6d84e0 100644 (file)
--- a/arch/s390/mm/maccess.c
+++ b/arch/s390/mm/maccess.c
@@ -172,32 +172,6 @@ void memcpy_absolute(void *dest, void *src, size_t count)
 }
 
 /*
- * Copy memory from kernel (real) to user (virtual)
- */
-int copy_to_user_real(void __user *dest, unsigned long src, unsigned long count)
-{
-       int offs = 0, size, rc;
-       char *buf;
-
-       buf = (char *) __get_free_page(GFP_KERNEL);
-       if (!buf)
-               return -ENOMEM;
-       rc = -EFAULT;
-       while (offs < count) {
-               size = min(PAGE_SIZE, count - offs);
-               if (memcpy_real(buf, src + offs, size))
-                       goto out;
-               if (copy_to_user(dest + offs, buf, size))
-                       goto out;
-               offs += size;
-       }
-       rc = 0;
-out:
-       free_page((unsigned long) buf);
-       return rc;
-}
-
-/*
  * Check if physical address is within prefix or zero page
  */
 static int is_swapped(phys_addr_t addr)