File kexec-tools-add-variant-helper-functions.patch of Package kexec-tools.17677

From: AKASHI Takahiro <takahiro.akashi@linaro.org>
Date: Fri, 11 Jan 2019 01:59:44 +0900
Subject: kexec: add variant helper functions for handling memory regions
References: jsc#SLE-9943
Upstream: not yet, it's under review in upstream

mem_regions_alloc_and_add() and mem_regions_alloc_and_exclude() are
functionally equivalent to, respectively, mem_regions_add() and
mem_regions_exclude() except the formers will re-allocate memory
dynamically when no more entries are available in 'ranges' array.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Signed-off-by: Chester Lin <clin@suse.com>
---
 kexec/mem_regions.c | 42 ++++++++++++++++++++++++++++++++++++++++++
 kexec/mem_regions.h |  7 +++++++
 2 files changed, 49 insertions(+)

diff --git a/kexec/mem_regions.c b/kexec/mem_regions.c
index 50c8abccb93a..ad7d3f13fd84 100644
--- a/kexec/mem_regions.c
+++ b/kexec/mem_regions.c
@@ -125,3 +125,45 @@ int mem_regions_exclude(struct memory_ranges *ranges,
 	}
 	return 0;
 }
+
+#define KEXEC_MEMORY_RANGES 16
+
+int mem_regions_alloc_and_add(struct memory_ranges *ranges,
+			      unsigned long long base,
+			      unsigned long long length, int type)
+{
+	void *new_ranges;
+
+	if (ranges->size >= ranges->max_size) {
+		new_ranges = realloc(ranges->ranges,
+				sizeof(struct memory_range) *
+				(ranges->max_size + KEXEC_MEMORY_RANGES));
+		if (!new_ranges)
+			return -1;
+
+		ranges->ranges = new_ranges;
+		ranges->max_size += KEXEC_MEMORY_RANGES;
+	}
+
+	return mem_regions_add(ranges, base, length, type);
+}
+
+int mem_regions_alloc_and_exclude(struct memory_ranges *ranges,
+				  const struct memory_range *range)
+{
+	void *new_ranges;
+
+	/* for safety, we should have at least one free entry in ranges */
+	if (ranges->size >= ranges->max_size) {
+		new_ranges = realloc(ranges->ranges,
+				sizeof(struct memory_range) *
+				(ranges->max_size + KEXEC_MEMORY_RANGES));
+		if (!new_ranges)
+			return -1;
+
+		ranges->ranges = new_ranges;
+		ranges->max_size += KEXEC_MEMORY_RANGES;
+	}
+
+	return mem_regions_exclude(ranges, range);
+}
diff --git a/kexec/mem_regions.h b/kexec/mem_regions.h
index ae9e972b0206..e306d67e3261 100644
--- a/kexec/mem_regions.h
+++ b/kexec/mem_regions.h
@@ -12,4 +12,11 @@ int mem_regions_exclude(struct memory_ranges *ranges,
 int mem_regions_add(struct memory_ranges *ranges, unsigned long long base,
                     unsigned long long length, int type);
 
+int mem_regions_alloc_and_exclude(struct memory_ranges *ranges,
+				  const struct memory_range *range);
+
+int mem_regions_alloc_and_add(struct memory_ranges *ranges,
+			      unsigned long long base,
+			      unsigned long long length, int type);
+
 #endif