path: root/arch
diff options
authorMark Rutland <mark.rutland@arm.com>2015-01-15 16:42:14 +0000
committerAlex Shi <alex.shi@linaro.org>2015-04-23 14:44:35 +0800
commite13c574895626b6e8bd53f340dbd47f67871b26b (patch)
tree4e744eca7fdd9c3963d1f6ff718dc11ffdb5be7c /arch
parent0bde84f40232e0f81bb9fa79d7953fed4a32811c (diff)
arm64: respect mem= for EFI
When booting with EFI, we acquire the EFI memory map after parsing the early params. This unfortuantely renders the option useless as we call memblock_enforce_memory_limit (which uses memblock_remove_range behind the scenes) before we've added any memblocks. We end up removing nothing, then adding all of memory later when efi_init calls reserve_regions. Instead, we can log the limit and apply this later when we do the rest of the memblock work in memblock_init, which should work regardless of the presence of EFI. At the same time we may as well move the early parameter into arm64's mm/init.c, close to arm64_memblock_init. Any memory which must be mapped (e.g. for use by EFI runtime services) must be mapped explicitly reather than relying on the linear mapping, which may be truncated as a result of a mem= option passed on the kernel command line. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Leif Lindholm <leif.lindholm@linaro.org> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> (cherry picked from commit 6083fe74b7bfffc2c7be8c711596608bda0cda6e) Signed-off-by: Alex Shi <alex.shi@linaro.org>
Diffstat (limited to 'arch')
2 files changed, 19 insertions, 19 deletions
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 97676952b269..9d704df65a6a 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -369,25 +369,6 @@ void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
return __va(memblock_alloc(size, align));
- * Limit the memory size that was specified via FDT.
- */
-static int __init early_mem(char *p)
- phys_addr_t limit;
- if (!p)
- return 1;
- limit = memparse(p, &p) & PAGE_MASK;
- pr_notice("Memory limited to %lldMB\n", limit >> 20);
- memblock_enforce_memory_limit(limit);
- return 0;
-early_param("mem", early_mem);
static void __init request_standard_resources(void)
struct memblock_region *region;
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index d0f86b74fce6..f2bded0254c3 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -141,11 +141,30 @@ static void arm64_memory_present(void)
+static phys_addr_t memory_limit = (phys_addr_t)ULLONG_MAX;
+ * Limit the memory size that was specified via FDT.
+ */
+static int __init early_mem(char *p)
+ if (!p)
+ return 1;
+ memory_limit = memparse(p, &p) & PAGE_MASK;
+ pr_notice("Memory limited to %lldMB\n", memory_limit >> 20);
+ return 0;
+early_param("mem", early_mem);
void __init arm64_memblock_init(void)
u64 *reserve_map, base, size;
phys_addr_t dma_phys_limit = 0;
+ memblock_enforce_memory_limit(memory_limit);
* Register the kernel text, kernel data, initrd, and initial
* pagetables with memblock.