1 files changed, 14 insertions, 4 deletions

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 21c6746338af..a0f52af256a0 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -501,7 +501,18 @@ static inline unsigned long long get_total_mem(void)
         return total << PAGE_SHIFT;
 }
 
-#define DEFAULT_BZIMAGE_ADDR_MAX 0x37FFFFFF
+/*
+ * Keep the crash kernel below this limit.  On 32 bits earlier kernels
+ * would limit the kernel to the low 512 MiB due to mapping restrictions.
+ * On 64 bits, kexec-tools currently limits us to 896 MiB; increase this
+ * limit once kexec-tools are fixed.
+ */
+#ifdef CONFIG_X86_32
+# define CRASH_KERNEL_ADDR_MAX  (512 << 20)
+#else
+# define CRASH_KERNEL_ADDR_MAX  (896 << 20)
+#endif
+
 static void __init reserve_crashkernel(void)
 {
         unsigned long long total_mem;
@@ -520,10 +531,10 @@ static void __init reserve_crashkernel(void)
                 const unsigned long long alignment = 16<<20;    /* 16M */
 
                 /*
-                 *  kexec want bzImage is below DEFAULT_BZIMAGE_ADDR_MAX
+                 *  kexec want bzImage is below CRASH_KERNEL_ADDR_MAX
                  */
                 crash_base = memblock_find_in_range(alignment,
-                               DEFAULT_BZIMAGE_ADDR_MAX, crash_size, alignment);
+                               CRASH_KERNEL_ADDR_MAX, crash_size, alignment);
 
                 if (crash_base == MEMBLOCK_ERROR) {
                         pr_info("crashkernel reservation failed - No suitable area found.\n");
@@ -769,7 +780,6 @@ void __init setup_arch(char **cmdline_p)
 
         x86_init.oem.arch_setup();
 
-        resource_alloc_from_bottom = 0;
         iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1;
         setup_memory_map();
         parse_setup_data();