Use extended crashkernel command line on i386

This patch removes the crashkernel parsing from
arch/i386/kernel/machine_kexec.c and calls the generic function, introduced in
the last patch, in setup_bootmem_allocator().

This is necessary because the amount of System RAM must be known in this
function now because of the new syntax.

Signed-off-by: Bernhard Walle <bwalle@suse.de>
Cc: Andi Kleen <ak@suse.de>
Cc: Vivek Goyal <vgoyal@in.ibm.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/x86/kernel/e820_32.c b/arch/x86/kernel/e820_32.c
index 3c86b97..d58039e 100644 (file)
--- a/arch/x86/kernel/e820_32.c
+++ b/arch/x86/kernel/e820_32.c
@@ -288,7 +288,8 @@ legacy_init_iomem_resources(struct resource *code_resource, struct resource *dat
                        request_resource(res, code_resource);
                        request_resource(res, data_resource);
 #ifdef CONFIG_KEXEC
-                       request_resource(res, &crashk_res);
+                       if (crashk_res.start != crashk_res.end)
+                               request_resource(res, &crashk_res);
 #endif
                }
        }

diff --git a/arch/x86/kernel/machine_kexec_32.c b/arch/x86/kernel/machine_kexec_32.c
index 8459ca6..11b935f 100644 (file)
--- a/arch/x86/kernel/machine_kexec_32.c
+++ b/arch/x86/kernel/machine_kexec_32.c
@@ -149,28 +149,6 @@ NORET_TYPE void machine_kexec(struct kimage *image)
                        image->start, cpu_has_pae);
 }
 
-/* crashkernel=size@addr specifies the location to reserve for
- * a crash kernel.  By reserving this memory we guarantee
- * that linux never sets it up as a DMA target.
- * Useful for holding code to do something appropriate
- * after a kernel panic.
- */
-static int __init parse_crashkernel(char *arg)
-{
-       unsigned long size, base;
-       size = memparse(arg, &arg);
-       if (*arg == '@') {
-               base = memparse(arg+1, &arg);
-               /* FIXME: Do I want a sanity check
-                * to validate the memory range?
-                */
-               crashk_res.start = base;
-               crashk_res.end   = base + size - 1;
-       }
-       return 0;
-}
-early_param("crashkernel", parse_crashkernel);
-
 void arch_crash_save_vmcoreinfo(void)
 {
 #ifdef CONFIG_ARCH_DISCONTIGMEM_ENABLE

diff --git a/arch/x86/kernel/setup_32.c b/arch/x86/kernel/setup_32.c
index b87a6fd..978dc01 100644 (file)
--- a/arch/x86/kernel/setup_32.c
+++ b/arch/x86/kernel/setup_32.c
@@ -378,6 +378,49 @@ extern unsigned long __init setup_memory(void);
 extern void zone_sizes_init(void);
 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
 
+static inline unsigned long long get_total_mem(void)
+{
+       unsigned long long total;
+
+       total = max_low_pfn - min_low_pfn;
+#ifdef CONFIG_HIGHMEM
+       total += highend_pfn - highstart_pfn;
+#endif
+
+       return total << PAGE_SHIFT;
+}
+
+#ifdef CONFIG_KEXEC
+static void __init reserve_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) {
+               if (crash_base > 0) {
+                       printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
+                                       "for crashkernel (System RAM: %ldMB)\n",
+                                       (unsigned long)(crash_size >> 20),
+                                       (unsigned long)(crash_base >> 20),
+                                       (unsigned long)(total_mem >> 20));
+                       crashk_res.start = crash_base;
+                       crashk_res.end   = crash_base + crash_size - 1;
+                       reserve_bootmem(crash_base, crash_size);
+               } else
+                       printk(KERN_INFO "crashkernel reservation failed - "
+                                       "you have to specify a base address\n");
+       }
+}
+#else
+static inline void __init reserve_crashkernel(void)
+{}
+#endif
+
 void __init setup_bootmem_allocator(void)
 {
        unsigned long bootmap_size;
@@ -453,11 +496,7 @@ void __init setup_bootmem_allocator(void)
                }
        }
 #endif
-#ifdef CONFIG_KEXEC
-       if (crashk_res.start != crashk_res.end)
-               reserve_bootmem(crashk_res.start,
-                       crashk_res.end - crashk_res.start + 1);
-#endif
+       reserve_crashkernel();
 }
 
 /*