New patch to review for coreboot: 27f2049 snprintf: lockless operation

[Vladimir Serbinenko]

Vladimir Serbinenko ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/4288

-gerrit

commit 27f204932f36cdecf54b5b8ddad48c88e6c91bd1
Author: Vladimir Serbinenko 
Date:   Tue Nov 26 21:48:57 2013 +0100

snprintf: lockless operation

Instead of having global variables put them on the stack.

Change-Id: I462e3b245612ff2dfb077da1cbcc5ac88f8b8e48
    Signed-off-by: Vladimir Serbinenko 
---
 src/console/vsprintf.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/src/console/vsprintf.c b/src/console/vsprintf.c
index 435401b..6210d01 100644
--- a/src/console/vsprintf.c
+++ b/src/console/vsprintf.c
@@ -20,32 +20,32 @@
  */

#include <string.h>
-#include <smp/spinlock.h>
 #include <console/vtxprintf.h>
 #include <trace.h>

-DECLARE_SPIN_LOCK(vsprintf_lock)
-
-static char *str_buf;
+struct context
+{
+	char *str_buf;
+};

-static void str_tx_byte(unsigned char byte)
+static void str_tx_byte(unsigned char byte, void *data)
 {
-	*str_buf = byte;
-	str_buf++;
+	struct context *ctx = data;
+	*ctx->str_buf = byte;
+	ctx->str_buf++;
 }

static int vsprintf(char *buf, const char *fmt, va_list args)
 {
    int i;
+	struct context ctx;

DISABLE_TRACE;
-	spin_lock(&vsprintf_lock);

-	str_buf = buf;
-	i = vtxprintf(str_tx_byte, fmt, args);
-	*str_buf = '\0';
+	ctx.str_buf = buf;
+	i = vtxdprintf(str_tx_byte, fmt, args, &ctx);
+	*ctx.str_buf = '\0';

-	spin_unlock(&vsprintf_lock);
    ENABLE_TRACE;

return i;