Unverified Commit 67a3ba25 authored by Marcin Nowakowski's avatar Marcin Nowakowski Committed by James Hogan
Browse files

MIPS: Fix incorrect mem=X@Y handling

Commit 73fbc1eb

 ("MIPS: fix mem=X@Y commandline processing") added a
fix to ensure that the memory range between PHYS_OFFSET and low memory
address specified by mem= cmdline argument is not later processed by
free_all_bootmem.  This change was incorrect for systems where the
commandline specifies more than 1 mem argument, as it will cause all
memory between PHYS_OFFSET and each of the memory offsets to be marked
as reserved, which results in parts of the RAM marked as reserved
(Creator CI20's u-boot has a default commandline argument 'mem=256M@0x0

Change the behaviour to ensure that only the range between PHYS_OFFSET
and the lowest start address of the memories is marked as protected.

This change also ensures that the range is marked protected even if it's
only defined through the devicetree and not only via commandline

Reported-by: default avatarMathieu Malaterre <mathieu.malaterre@gmail.com>
Signed-off-by: default avatarMarcin Nowakowski <marcin.nowakowski@mips.com>
Fixes: 73fbc1eb

 ("MIPS: fix mem=X@Y commandline processing")
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: <stable@vger.kernel.org> # v4.11+
Tested-by: default avatarMathieu Malaterre <malat@debian.org>
Patchwork: https://patchwork.linux-mips.org/patch/18562/

Signed-off-by: default avatarJames Hogan <jhogan@kernel.org>
parent 627f4a2b
......@@ -375,6 +375,7 @@ static void __init bootmem_init(void)
unsigned long reserved_end;
unsigned long mapstart = ~0UL;
unsigned long bootmap_size;
phys_addr_t ramstart = (phys_addr_t)ULLONG_MAX;
bool bootmap_valid = false;
int i;
......@@ -395,7 +396,8 @@ static void __init bootmem_init(void)
max_low_pfn = 0;
* Find the highest page frame number we have available.
* Find the highest page frame number we have available
* and the lowest used RAM address
for (i = 0; i < boot_mem_map.nr_map; i++) {
unsigned long start, end;
......@@ -407,6 +409,8 @@ static void __init bootmem_init(void)
end = PFN_DOWN(boot_mem_map.map[i].addr
+ boot_mem_map.map[i].size);
ramstart = min(ramstart, boot_mem_map.map[i].addr);
* Skip highmem here so we get an accurate max_low_pfn if low
......@@ -436,6 +440,13 @@ static void __init bootmem_init(void)
mapstart = max(reserved_end, start);
* Reserve any memory between the start of RAM and PHYS_OFFSET
if (ramstart > PHYS_OFFSET)
add_memory_region(PHYS_OFFSET, ramstart - PHYS_OFFSET,
if (min_low_pfn >= max_low_pfn)
panic("Incorrect memory mapping !!!");
if (min_low_pfn > ARCH_PFN_OFFSET) {
......@@ -664,9 +675,6 @@ static int __init early_parse_mem(char *p)
add_memory_region(start, size, BOOT_MEM_RAM);
if (start && start > PHYS_OFFSET)
add_memory_region(PHYS_OFFSET, start - PHYS_OFFSET,
return 0;
early_param("mem", early_parse_mem);
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