lib/vsprintf.c: add %pa format specifier for phys_addr_t types

Add the %pa format specifier for printing a phys_addr_t type and its
derivative types (such as resource_size_t), since the physical address
size on some platforms can vary based on build options, regardless of
the native integer type.

Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
Cc: Rob Landley <rob@landley.net>
Cc: George Spelvin <linux@horizon.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Cc: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt
index 8ffb274..e8a6aa4 100644 (file)
--- a/Documentation/printk-formats.txt
+++ b/Documentation/printk-formats.txt
@@ -53,6 +53,14 @@ Struct Resources:
        For printing struct resources. The 'R' and 'r' specifiers result in a
        printed resource with ('R') or without ('r') a decoded flags member.
 
+Physical addresses:
+
+       %pa     0x01234567 or 0x0123456789abcdef
+
+       For printing a phys_addr_t type (and its derivatives, such as
+       resource_size_t) which can vary based on build options, regardless of
+       the width of the CPU data path. Passed by reference.
+
 Raw buffer as a hex string:
        %*ph    00 01 02  ...  3f
        %*phC   00:01:02: ... :3f
@@ -150,9 +158,9 @@ s64 SHOULD be printed with %lld/%llx, (long long):
        printk("%lld", (long long)s64_var);
 
 If <type> is dependent on a config option for its size (e.g., sector_t,
-blkcnt_t, phys_addr_t, resource_size_t) or is architecture-dependent
-for its size (e.g., tcflag_t), use a format specifier of its largest
-possible type and explicitly cast to it.  Example:
+blkcnt_t) or is architecture-dependent for its size (e.g., tcflag_t), use a
+format specifier of its largest possible type and explicitly cast to it.
+Example:
 
        printk("test: sector number/total blocks: %llu/%llu\n",
                (unsigned long long)sector, (unsigned long long)blockcount);

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index fab33a9..0d62fd7 100644 (file)
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1030,6 +1030,7 @@ int kptr_restrict __read_mostly;
  *              N no separator
  *            The maximum supported length is 64 bytes of the input. Consider
  *            to use print_hex_dump() for the larger input.
+ * - 'a' For a phys_addr_t type and its derivative types (passed by reference)
  *
  * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
  * function pointers are really function descriptors, which contain a
@@ -1120,6 +1121,12 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
                        return netdev_feature_string(buf, end, ptr, spec);
                }
                break;
+       case 'a':
+               spec.flags |= SPECIAL | SMALL | ZEROPAD;
+               spec.field_width = sizeof(phys_addr_t) * 2 + 2;
+               spec.base = 16;
+               return number(buf, end,
+                             (unsigned long long) *((phys_addr_t *)ptr), spec);
        }
        spec.flags |= SMALL;
        if (spec.field_width == -1) {