MIPS: kexec: Fix random crashes while loading crashkernel

Fixed compilation errors in case of non-KEXEC kernel
Rearranging code so that crashk_res gets updated.
- crashk_res is updated after mips_parse_crashkernel(),
   after resource_init(), which is after arch_mem_init().
- The reserved memory is actually treated as Usable memory,
   Unless we load the crash kernel, everything works.

Signed-off-by: Prem Mallappa <pmallappa@caviumnetworks.com>
Cc: linux-mips <linux-mips@linux-mips.org>
Patchwork: http://patchwork.linux-mips.org/patch/5805/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index c7f9051..c538d6e 100644 (file)
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -552,6 +552,52 @@ static void __init arch_mem_addpart(phys_t mem, phys_t end, int type)
        add_memory_region(mem, size, type);
 }
 
+#ifdef CONFIG_KEXEC
+static inline unsigned long long get_total_mem(void)
+{
+       unsigned long long total;
+
+       total = max_pfn - min_low_pfn;
+       return total << PAGE_SHIFT;
+}
+
+static void __init mips_parse_crashkernel(void)
+{
+       unsigned long long total_mem;
+       unsigned long long crash_size, crash_base;
+       int ret;
+
+       total_mem = get_total_mem();
+       ret = parse_crashkernel(boot_command_line, total_mem,
+                               &crash_size, &crash_base);
+       if (ret != 0 || crash_size <= 0)
+               return;
+
+       crashk_res.start = crash_base;
+       crashk_res.end   = crash_base + crash_size - 1;
+}
+
+static void __init request_crashkernel(struct resource *res)
+{
+       int ret;
+
+       ret = request_resource(res, &crashk_res);
+       if (!ret)
+               pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
+                       (unsigned long)((crashk_res.end -
+                                        crashk_res.start + 1) >> 20),
+                       (unsigned long)(crashk_res.start  >> 20));
+}
+#else /* !defined(CONFIG_KEXEC)                */
+static void __init mips_parse_crashkernel(void)
+{
+}
+
+static void __init request_crashkernel(struct resource *res)
+{
+}
+#endif /* !defined(CONFIG_KEXEC)  */
+
 static void __init arch_mem_init(char **cmdline_p)
 {
        extern void plat_mem_setup(void);
@@ -608,6 +654,8 @@ static void __init arch_mem_init(char **cmdline_p)
                                BOOTMEM_DEFAULT);
        }
 #endif
+
+       mips_parse_crashkernel();
 #ifdef CONFIG_KEXEC
        if (crashk_res.start != crashk_res.end)
                reserve_bootmem(crashk_res.start,
@@ -620,52 +668,6 @@ static void __init arch_mem_init(char **cmdline_p)
        paging_init();
 }
 
-#ifdef CONFIG_KEXEC
-static inline unsigned long long get_total_mem(void)
-{
-       unsigned long long total;
-
-       total = max_pfn - min_low_pfn;
-       return total << PAGE_SHIFT;
-}
-
-static void __init mips_parse_crashkernel(void)
-{
-       unsigned long long total_mem;
-       unsigned long long crash_size, crash_base;
-       int ret;
-
-       total_mem = get_total_mem();
-       ret = parse_crashkernel(boot_command_line, total_mem,
-                               &crash_size, &crash_base);
-       if (ret != 0 || crash_size <= 0)
-               return;
-
-       crashk_res.start = crash_base;
-       crashk_res.end   = crash_base + crash_size - 1;
-}
-
-static void __init request_crashkernel(struct resource *res)
-{
-       int ret;
-
-       ret = request_resource(res, &crashk_res);
-       if (!ret)
-               pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
-                       (unsigned long)((crashk_res.end -
-                               crashk_res.start + 1) >> 20),
-                       (unsigned long)(crashk_res.start  >> 20));
-}
-#else /* !defined(CONFIG_KEXEC)         */
-static void __init mips_parse_crashkernel(void)
-{
-}
-
-static void __init request_crashkernel(struct resource *res)
-{
-}
-#endif /* !defined(CONFIG_KEXEC)  */
-
 static void __init resource_init(void)
 {
        int i;
@@ -678,11 +680,6 @@ static void __init resource_init(void)
        data_resource.start = __pa_symbol(&_etext);
        data_resource.end = __pa_symbol(&_edata) - 1;
 
-       /*
-        * Request address space for all standard RAM.
-        */
-       mips_parse_crashkernel();
-
        for (i = 0; i < boot_mem_map.nr_map; i++) {
                struct resource *res;
                unsigned long start, end;