Blackfin arch: move the init sections to the end of memory to help decrease memory fragementation

move the init sections to the end of memory, so that after they
are free, run time memory is all continugous - this should help decrease
memory fragementation. When doing this, we also pack some of the other
sections a little closer together, to make sure we don't waste memory.
To make this happen, we need to rename the .data.init_task section to
.init_task.data, so it doesn't get picked up by the linker script glob.

Signed-off-by: Robin Getz <robin.getz@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/arch/blackfin/kernel/setup.c b/arch/blackfin/kernel/setup.c
index 934234f43839..dfe06b09a9d4 100644
--- a/arch/blackfin/kernel/setup.c
+++ b/arch/blackfin/kernel/setup.c
@@ -236,7 +236,7 @@ void __init setup_arch(char **cmdline_p)
         /* by now the stack is part of the init task */
         memory_end = _ramend - DMA_UNCACHED_REGION;
 
-        _ramstart = (unsigned long)__bss_stop;
+        _ramstart = (unsigned long)_end;
         memory_start = PAGE_ALIGN(_ramstart);
 
 #if defined(CONFIG_MTD_UCLINUX)
@@ -285,7 +285,7 @@ void __init setup_arch(char **cmdline_p)
         }
 
         /* Relocate MTD image to the top of memory after the uncached memory area */
-        dma_memcpy((char *)memory_end, __bss_stop, mtd_size);
+        dma_memcpy((char *)memory_end, _end, mtd_size);
 
         memory_mtd_start = memory_end;
         _ebss = memory_mtd_start;       /* define _ebss for compatible */
@@ -357,10 +357,10 @@ void __init setup_arch(char **cmdline_p)
         printk(KERN_INFO "Memory map:\n"
                KERN_INFO "  text      = 0x%p-0x%p\n"
                KERN_INFO "  rodata    = 0x%p-0x%p\n"
+               KERN_INFO "  bss       = 0x%p-0x%p\n"
                KERN_INFO "  data      = 0x%p-0x%p\n"
                KERN_INFO "    stack   = 0x%p-0x%p\n"
                KERN_INFO "  init      = 0x%p-0x%p\n"
-               KERN_INFO "  bss       = 0x%p-0x%p\n"
                KERN_INFO "  available = 0x%p-0x%p\n"
 #ifdef CONFIG_MTD_UCLINUX
                KERN_INFO "  rootfs    = 0x%p-0x%p\n"
@@ -370,10 +370,10 @@ void __init setup_arch(char **cmdline_p)
 #endif
                , _stext, _etext,
                __start_rodata, __end_rodata,
+               __bss_start, __bss_stop,
                _sdata, _edata,
                (void *)&init_thread_union, (void *)((int)(&init_thread_union) + 0x2000),
                __init_begin, __init_end,
-               __bss_start, __bss_stop,
                (void *)_ramstart, (void *)memory_end
 #ifdef CONFIG_MTD_UCLINUX
                , (void *)memory_mtd_start, (void *)(memory_mtd_start + mtd_size)