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From: Tobias Wolf <dev-NTEO@vplace.de>
Subject: [v2] MIPS: Fix memory reservation in bootmem_init for certain non-usermem setups
Commit 67a3ba25aa95 ("MIPS: Fix incorrect mem=X@Y handling") introduced a new
issue for rt288x where "PHYS_OFFSET" is 0x0 but the calculated "ramstart" is
not. As the prerequisite of custom memory map has been removed, this results
in the full memory range of 0x0 - 0x8000000 to be marked as reserved for this
platform.
v2: Correctly compare that usermem is not null.
This patch adds the originally intended prerequisite again.
Signed-off-by: Tobias Wolf <dev-NTEO@vplace.de>
---
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -249,6 +249,8 @@ static unsigned long __init init_initrd(
* Initialize the bootmem allocator. It also setup initrd related data
* if needed.
*/
+static int usermem __initdata;
+
#if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON64) && defined(CONFIG_NUMA))
static void __init bootmem_init(void)
@@ -288,7 +290,7 @@ static void __init bootmem_init(void)
/*
* Reserve any memory between the start of RAM and PHYS_OFFSET
*/
- if (ramstart > PHYS_OFFSET)
+ if (usermem && ramstart > PHYS_OFFSET)
memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET);
if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) {
@@ -336,8 +338,6 @@ static void __init bootmem_init(void)
#endif /* CONFIG_SGI_IP27 */
-static int usermem __initdata;
-
static int __init early_parse_mem(char *p)
{
phys_addr_t start, size;
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