linux-kernel - Re: [PATCH] x86: split e820 reserved entries record to late v4

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Date:	Mon, 13 Oct 2008 14:46:28 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"H. Peter Anvin" <hpa@...or.com>
cc:	Tony Luck <tony.luck@...el.com>,
	Yinghai Lu <yhlu.kernel@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, tglx@...utronix.de,
	jbarnes@...tuousgeek.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: split e820 reserved entries record to late v4 -
 fix v7



On Mon, 13 Oct 2008, H. Peter Anvin wrote:
> 
> Here is a fix... currently running standard tests on it.

Or we could do what Andrew suggested some time ago, and extend %p to do 
resource printing, like %pS and %pF.

TOTALLY UNTESTED! But something like this might allow

	printk(KERN_DEBUG "  reserve_region: (%s) %pR\n"
		res->name, res);

and if I did things right it should print

	reserve_region: (name) [xx-xx]

and maybe it's worth it. We certainly do seem to have a fair number of 
those irritating casts for resource printouts.

		Linus
---
 lib/vsprintf.c |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index c399bc1..dd62557 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -24,6 +24,7 @@
 #include <linux/kernel.h>
 #include <linux/kallsyms.h>
 #include <linux/uaccess.h>
+#include <linux/ioport.h>
 
 #include <asm/page.h>		/* for PAGE_SIZE */
 #include <asm/div64.h>
@@ -528,6 +529,21 @@ static char *symbol_string(char *buf, char *end, void *ptr, int field_width, int
 #endif
 }
 
+static char *resource_string(char *buf, char *end, struct resource *res, int field_width, int precision, int flags)
+{
+	char sym[4*sizeof(resource_size_t) + 4];
+	char *p = sym, *pend = sym + sizeof(sym);
+
+	*p++ = '[';
+	p = number(p, pend, res->start, 16, -1, -1, 0);
+	*p++ = '-';
+	p = number(p, pend, res->end, 16, -1, -1, 0);
+	*p++ = ']';
+	*p = 0;
+
+	return string(buf, end, sym, field_width, precision, flags);
+}
+
 /*
  * Show a '%p' thing.  A kernel extension is that the '%p' is followed
  * by an extra set of alphanumeric characters that are extended format
@@ -549,6 +565,8 @@ static char *pointer(const char *fmt, char *buf, char *end, void *ptr, int field
 		/* Fallthrough */
 	case 'S':
 		return symbol_string(buf, end, ptr, field_width, precision, flags);
+	case 'R':
+		return resource_string(buf, end, ptr, field_width, precision, flags);
 	}
 	flags |= SMALL;
 	if (field_width == -1) {
--
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