[PATCH] makedumpfile: Enable --mem-usage for s390x

[Michael Holzheu]

Implement is_vmalloc_addr() using /proc/iommem parsing to enable the new
makedumpfile option "--mem-usage".

Signed-off-by: Michael Holzheu <holzheu at linux.vnet.ibm.com>
---
 makedumpfile.c |   26 ++++++++++++++++++++++++++
 makedumpfile.h |    3 ++-
 2 files changed, 28 insertions(+), 1 deletion(-)

--- a/makedumpfile.c
+++ b/makedumpfile.c
@@ -9227,6 +9227,32 @@ int is_crashkernel_mem_reserved(void)
 	return !!crash_reserved_mem_nr;
 }
 
+struct addr_check {
+	unsigned long addr;
+	int found;
+};
+
+static int phys_addr_callback(void *data, int nr, char *str,
+			      unsigned long base, unsigned long length)
+{
+	struct addr_check *addr_check = data;
+	unsigned long addr = addr_check->addr;
+
+	if (addr >= base && addr < base + length) {
+		addr_check->found = 1;
+		return -1;
+	}
+	return 0;
+}
+
+int is_iomem_phys_addr(unsigned long addr)
+{
+	struct addr_check addr_check = {addr, 0};
+
+	iomem_for_each_line("System RAM\n", phys_addr_callback, &addr_check);
+	return addr_check.found;
+}
+
 static int get_page_offset(void)
 {
 	struct utsname utsname;
--- a/makedumpfile.h
+++ b/makedumpfile.h
@@ -820,7 +820,7 @@ unsigned long long vaddr_to_paddr_s390x(
 #define get_machdep_info()	get_machdep_info_s390x()
 #define get_versiondep_info()	TRUE
 #define vaddr_to_paddr(X)	vaddr_to_paddr_s390x(X)
-#define is_vmalloc_addr(X)	TRUE
+#define is_vmalloc_addr(X)	(!is_iomem_phys_addr(X))
 #endif          /* s390x */
 
 #ifdef __ia64__ /* ia64 */
@@ -1567,6 +1567,7 @@ int read_disk_dump_header(struct disk_du
 int read_kdump_sub_header(struct kdump_sub_header *kh, char *filename);
 void close_vmcoreinfo(void);
 int close_files_for_creating_dumpfile(void);
+int is_iomem_phys_addr(unsigned long addr);
 
 
 /*