diff options
| -rw-r--r-- | Documentation/kdump/kdump.txt | 13 | ||||
| -rw-r--r-- | arch/arm/kernel/setup.c | 29 |
2 files changed, 32 insertions, 10 deletions
diff --git a/Documentation/kdump/kdump.txt b/Documentation/kdump/kdump.txt index bc4bd5a..88ff63d 100644 --- a/Documentation/kdump/kdump.txt +++ b/Documentation/kdump/kdump.txt @@ -263,12 +263,6 @@ The syntax is: crashkernel=<range1>:<size1>[,<range2>:<size2>,...][@offset] range=start-[end] -Please note, on arm, the offset is required. - crashkernel=<range1>:<size1>[,<range2>:<size2>,...]@offset - range=start-[end] - - 'start' is inclusive and 'end' is exclusive. - For example: crashkernel=512M-2G:64M,2G-:128M @@ -307,10 +301,9 @@ Boot into System Kernel on the memory consumption of the kdump system. In general this is not dependent on the memory size of the production system. - On arm, use "crashkernel=Y@X". Note that the start address of the kernel - will be aligned to 128MiB (0x08000000), so if the start address is not then - any space below the alignment point may be overwritten by the dump-capture kernel, - which means it is possible that the vmcore is not that precise as expected. + On arm, the use of "crashkernel=Y@X" is no longer necessary; the + kernel will automatically locate the crash kernel image within the + first 512MB of RAM if X is not given. Load the Dump-capture Kernel diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c index 139791e..77b54c4 100644 --- a/arch/arm/kernel/setup.c +++ b/arch/arm/kernel/setup.c @@ -938,6 +938,13 @@ static int __init init_machine_late(void) late_initcall(init_machine_late); #ifdef CONFIG_KEXEC +/* + * The crash region must be aligned to 128MB to avoid + * zImage relocating below the reserved region. + */ +#define CRASH_ALIGN (128 << 20) +#define CRASH_ADDR_MAX (PHYS_OFFSET + (512 << 20)) + static inline unsigned long long get_total_mem(void) { unsigned long total; @@ -965,6 +972,28 @@ static void __init reserve_crashkernel(void) if (ret) return; + if (crash_base <= 0) { + unsigned long long crash_max = CRASH_ADDR_MAX; + if (crash_max > (u32)~0) + crash_max = (u32)~0; + crash_base = memblock_find_in_range(CRASH_ALIGN, crash_max, + crash_size, CRASH_ALIGN); + if (!crash_base) { + pr_err("crashkernel reservation failed - No suitable area found.\n"); + return; + } + } else { + unsigned long long start; + + start = memblock_find_in_range(crash_base, + crash_base + crash_size, + crash_size, SECTION_SIZE); + if (start != crash_base) { + pr_err("crashkernel reservation failed - memory is in use.\n"); + return; + } + } + ret = memblock_reserve(crash_base, crash_size); if (ret < 0) { pr_warn("crashkernel reservation failed - memory is in use (0x%lx)\n", |
