linux-kernel - Re: [PATCH] usb: musb: use the new %pa format specifier for dma_addr

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Date:	Sat, 01 Jun 2013 16:22:18 -0700
From:	Joe Perches <joe@...ches.com>
To:	Emil Goode <emilgoode@...il.com>
Cc:	Randy Dunlap <rdunlap@...radead.org>,
	Stepan Moskovchenko <stepanm@...eaurora.org>, balbi@...com,
	gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] usb: musb: use the new %pa format specifier for
 dma_addr_t

On Sun, 2013-06-02 at 01:06 +0200, Emil Goode wrote:
> Maybe there should be another format specifier %da and Randy's
> clarifying comment

maybe %pad but I think the whole thing isn't much necessary.
It seems there are a grand total of 3 uses of %pa today.

Maybe:
---
 Documentation/printk-formats.txt |  7 +++++++
 lib/vsprintf.c                   | 19 +++++++++++++++----
 2 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt
index 3af5ae6..fa48403 100644
--- a/Documentation/printk-formats.txt
+++ b/Documentation/printk-formats.txt
@@ -63,6 +63,13 @@ Physical addresses:
 	resource_size_t) which can vary based on build options, regardless of
 	the width of the CPU data path. Passed by reference.
 
+dma_addr_t addresses:
+
+	%pad	0x01234567 or 0x0123456789abcdef
+
+	For printing a dma_addr_t type 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
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 7d84676..b6b8390 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1039,6 +1039,7 @@ int kptr_restrict __read_mostly;
  *            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)
+ * - 'ad' For a dma_addr_t type
  *
  * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
  * function pointers are really function descriptors, which contain a
@@ -1129,12 +1130,22 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
 			return netdev_feature_string(buf, end, ptr, spec);
 		}
 		break;
-	case 'a':
+	case 'a': {
+		unsigned long long val;
 		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);
+		switch (fmt[1]) {
+		case 'd':
+			spec.field_width = sizeof(dma_addr_t) * 2 + 2;
+			val = (unsigned long long)*((dma_addr_t *)ptr);
+			break;
+		default:
+			spec.field_width = sizeof(phys_addr_t) * 2 + 2;
+			val = (unsigned long long)*((phys_addr_t *)ptr);
+			break;
+		}
+		return number(buf, end, val, spec);
+	}
 	}
 	spec.flags |= SMALL;
 	if (spec.field_width == -1) {


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