[PATCH 2/4] kexec-tools: mips: Don't set lowmem_limit to 2G for 64-bit systems.

[David Daney]

The 64-bit MIPS architecture doesn't have the same 2G limit the 32-bit
version has.  Set MAXMEM and lowmem_limit to 0 for 64-bit MIPS so that
memory above 2G is usable in the kdump core files.

Signed-off-by: David Daney <david.daney at cavium.com>
---
 kexec/arch/mips/crashdump-mips.c | 4 ++--
 kexec/arch/mips/crashdump-mips.h | 3 ++-
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/kexec/arch/mips/crashdump-mips.c b/kexec/arch/mips/crashdump-mips.c
index 6308ec8..22fc38e 100644
--- a/kexec/arch/mips/crashdump-mips.c
+++ b/kexec/arch/mips/crashdump-mips.c
@@ -201,7 +201,7 @@ static int get_crash_memory_ranges(struct memory_range **range, int *ranges)
 		memory_ranges++;
 
 		/* Segregate linearly mapped region. */
-		if ((MAXMEM - 1) >= start && (MAXMEM - 1) <= end) {
+		if (MAXMEM && (MAXMEM - 1) >= start && (MAXMEM - 1) <= end) {
 			crash_memory_range[memory_ranges - 1].end = MAXMEM - 1;
 
 			/* Add segregated region. */
@@ -304,7 +304,7 @@ static struct crash_elf_info elf_info64 = {
 	data : ELFDATALOCAL,
 	machine : EM_MIPS,
 	page_offset : PAGE_OFFSET,
-	lowmem_limit : MAXMEM,
+	lowmem_limit : 0, /* 0 == no limit */
 };
 
 static struct crash_elf_info elf_info32 = {
diff --git a/kexec/arch/mips/crashdump-mips.h b/kexec/arch/mips/crashdump-mips.h
index c986835..7edd859 100644
--- a/kexec/arch/mips/crashdump-mips.h
+++ b/kexec/arch/mips/crashdump-mips.h
@@ -6,12 +6,13 @@ int load_crashdump_segments(struct kexec_info *info, char *mod_cmdline,
 				unsigned long max_addr, unsigned long min_base);
 #ifdef __mips64
 #define PAGE_OFFSET	0xa800000000000000ULL
+#define MAXMEM		0
 #else
 #define PAGE_OFFSET	0x80000000
+#define MAXMEM		0x80000000
 #endif
 #define __pa(x)		((unsigned long)(X) & 0x7fffffff)
 
-#define MAXMEM		0x80000000
 
 #define CRASH_MAX_MEMMAP_NR	(KEXEC_MAX_SEGMENTS + 1)
 #define CRASH_MAX_MEMORY_RANGES	(MAX_MEMORY_RANGES + 2)
-- 
2.9.5