powerpc: make mem= work on iSeries again

By parsing the command line earlier, we can add the mem= value to the
flattened device tree and let the generic code sort out the memory limit
for us.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index 40c4810..19530ce 100644 (file)
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -631,23 +631,6 @@ static int ppc64_panic_event(struct notifier_block *this,
        return NOTIFY_DONE;
 }
 
-#ifdef CONFIG_PPC_ISERIES
-/*
- * On iSeries we just parse the mem=X option from the command line.
- * On pSeries it's a bit more complicated, see prom_init_mem()
- */
-static int __init early_parsemem(char *p)
-{
-       if (!p)
-               return 0;
-
-       memory_limit = ALIGN(memparse(p, &p), PAGE_SIZE);
-
-       return 0;
-}
-early_param("mem", early_parsemem);
-#endif /* CONFIG_PPC_ISERIES */
-
 #ifdef CONFIG_IRQSTACKS
 static void __init irqstack_early_init(void)
 {

diff --git a/arch/powerpc/platforms/iseries/setup.c b/arch/powerpc/platforms/iseries/setup.c
index 1544c6f..06431e6 100644 (file)
--- a/arch/powerpc/platforms/iseries/setup.c
+++ b/arch/powerpc/platforms/iseries/setup.c
@@ -27,6 +27,7 @@
 #include <linux/kdev_t.h>
 #include <linux/major.h>
 #include <linux/root_dev.h>
+#include <linux/kernel.h>
 
 #include <asm/processor.h>
 #include <asm/machdep.h>
@@ -94,6 +95,8 @@ extern unsigned long iSeries_recal_titan;
 
 static int mf_initialized;
 
+static unsigned long cmd_mem_limit;
+
 struct MemoryBlock {
        unsigned long absStart;
        unsigned long absEnd;
@@ -341,23 +344,6 @@ static void __init iSeries_init_early(void)
         */
        iommu_init_early_iSeries();
 
-       iSeries_get_cmdline();
-
-       /* Save unparsed command line copy for /proc/cmdline */
-       strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
-
-       /* Parse early parameters, in particular mem=x */
-       parse_early_param();
-
-       if (memory_limit) {
-               if (memory_limit < systemcfg->physicalMemorySize)
-                       systemcfg->physicalMemorySize = memory_limit;
-               else {
-                       printk("Ignoring mem=%lu >= ram_top.\n", memory_limit);
-                       memory_limit = 0;
-               }
-       }
-
        /* Initialize machine-dependency vectors */
 #ifdef CONFIG_SMP
        smp_init_iSeries();
@@ -971,6 +957,8 @@ void build_flat_dt(struct iseries_flat_dt *dt)
        /* /chosen */
        dt_start_node(dt, "chosen");
        dt_prop_u32(dt, "linux,platform", PLATFORM_ISERIES_LPAR);
+       if (cmd_mem_limit)
+               dt_prop_u64(dt, "linux,memory-limit", cmd_mem_limit);
        dt_end_node(dt);
 
        dt_cpus(dt);
@@ -990,7 +978,27 @@ void * __init iSeries_early_setup(void)
         */
        build_iSeries_Memory_Map();
 
+       iSeries_get_cmdline();
+
+       /* Save unparsed command line copy for /proc/cmdline */
+       strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
+
+       /* Parse early parameters, in particular mem=x */
+       parse_early_param();
+
        build_flat_dt(&iseries_dt);
 
        return (void *) __pa(&iseries_dt);
 }
+
+/*
+ * On iSeries we just parse the mem=X option from the command line.
+ * On pSeries it's a bit more complicated, see prom_init_mem()
+ */
+static int __init early_parsemem(char *p)
+{
+       if (p)
+               cmd_mem_limit = ALIGN(memparse(p, &p), PAGE_SIZE);
+       return 0;
+}
+early_param("mem", early_parsemem);