kexec-tools/kexec-tools-ppc64-reinit.diff

From: Chandru S <chandru@linux.vnet.ibm.com>
Subject: [PATCH] powerpc: initialize drconf variables
References: bnc #468571

The ppc64-memory-ranges-dynamic.diff patch which added
realloc_memory_ranges() code to kexec-tools somehow removed
the initialization of lmb-size and num_of_lmbs required in
case of /proc/ibm,dynamic-reconfiguration-memory node.  
Add the code here to initialize them back again in kexec-tools 

Signed-off-by: Chandru S <chandru@linux.vnet.ibm.com>
Acked-by: Bernhard Walle <bwalle@suse.de>

---
 kexec/arch/ppc64/kexec-ppc64.c |   27 +++++++++++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

--- a/kexec/arch/ppc64/kexec-ppc64.c
+++ b/kexec/arch/ppc64/kexec-ppc64.c
@@ -96,7 +96,7 @@ err1:
 
 }
 
-static int realloc_memory_ranges()
+static int realloc_memory_ranges(void)
 {
 	size_t memory_range_len;
 
@@ -150,6 +150,23 @@ static int get_dyn_reconf_base_ranges(vo
 	FILE *file;
 	int i, n;
 
+	strcpy(fname, "/proc/device-tree/");
+	strcat(fname, "ibm,dynamic-reconfiguration-memory/ibm,lmb-size");
+	if ((file = fopen(fname, "r")) == NULL) {
+		perror(fname);
+		return -1;
+	}
+	if (fread(buf, 1, 8, file) != 8) {
+		perror(fname);
+		fclose(file);
+		return -1;
+	}
+	/*
+	 * lmb_size, num_of_lmbs(global variables) are
+	 * initialized once here.
+	 */
+	lmb_size = ((uint64_t *)buf)[0];
+	fclose(file);
 
 	strcpy(fname, "/proc/device-tree/");
 	strcat(fname,
@@ -158,8 +175,14 @@ static int get_dyn_reconf_base_ranges(vo
 		perror(fname);
 		return -1;
 	}
+	/* first 4 bytes tell the number of lmbs */
+	if (fread(buf, 1, 4, file) != 4) {
+		perror(fname);
+		fclose(file);
+		return -1;
+	}
+	num_of_lmbs = ((unsigned int *)buf)[0];
 
-	fseek(file, 4, SEEK_SET);
 	for (i = 0; i < num_of_lmbs; i++) {
 		if ((n = fread(buf, 1, 24, file)) < 0) {
 			perror(fname);