On 01/30/21 at 03:10pm, Chen Zhou wrote:
> Move CRASH_ALIGN to header asm/kexec.h for later use. Besides, the
> alignment of crash kernel regions in x86 is 16M(CRASH_ALIGN), but
> function reserve_crashkernel() also used 1M alignment. So just
> replace hard-coded alignment 1M with macro CRASH_ALIGN.
>
> Suggested-by: Dave Young <dyo...@redhat.com>
> Suggested-by: Baoquan He <b...@redhat.com>
> Signed-off-by: Chen Zhou <chenzho...@huawei.com>
> Tested-by: John Donnelly <john.p.donne...@oracle.com>
> ---
> arch/x86/include/asm/kexec.h | 3 +++
> arch/x86/kernel/setup.c | 5 +----
> 2 files changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/arch/x86/include/asm/kexec.h b/arch/x86/include/asm/kexec.h
> index 6802c59e8252..be18dc7ae51f 100644
> --- a/arch/x86/include/asm/kexec.h
> +++ b/arch/x86/include/asm/kexec.h
> @@ -18,6 +18,9 @@
>
> # define KEXEC_CONTROL_CODE_MAX_SIZE 2048
>
> +/* 16M alignment for crash kernel regions */
> +#define CRASH_ALIGN SZ_16M
> +
> #ifndef __ASSEMBLY__
>
> #include <linux/string.h>
> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
> index 3412c4595efd..da769845597d 100644
> --- a/arch/x86/kernel/setup.c
> +++ b/arch/x86/kernel/setup.c
> @@ -390,9 +390,6 @@ static void __init
> memblock_x86_reserve_range_setup_data(void)
>
> #ifdef CONFIG_KEXEC_CORE
>
> -/* 16M alignment for crash kernel regions */
> -#define CRASH_ALIGN SZ_16M
> -
> /*
> * Keep the crash kernel below this limit.
> *
> @@ -510,7 +507,7 @@ static void __init reserve_crashkernel(void)
> } else {
> unsigned long long start;
>
> - start = memblock_phys_alloc_range(crash_size, SZ_1M, crash_base,
> + start = memblock_phys_alloc_range(crash_size, CRASH_ALIGN,
> crash_base,
> crash_base + crash_size);
Looks good to me, thx.
Acked-by: Baoquan He <b...@redhat.com>
> if (start != crash_base) {
> pr_info("crashkernel reservation failed - memory is in
> use.\n");
> --
> 2.20.1
>
