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SubjectRe: [PATCH v14 03/11] x86: kdump: use macro CRASH_ADDR_LOW_MAX in functions reserve_crashkernel()
On 01/30/21 at 03:10pm, Chen Zhou wrote:
> To make the functions reserve_crashkernel() as generic,
> replace some hard-coded numbers with macro CRASH_ADDR_LOW_MAX.
>
> Signed-off-by: Chen Zhou <chenzhou10@huawei.com>
> Tested-by: John Donnelly <John.p.donnelly@oracle.com>
> ---
> arch/x86/kernel/setup.c | 7 ++++---
> 1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
> index 27470479e4a3..086a04235be4 100644
> --- a/arch/x86/kernel/setup.c
> +++ b/arch/x86/kernel/setup.c
> @@ -487,8 +487,9 @@ static void __init reserve_crashkernel(void)
> if (!crash_base) {
> /*
> * Set CRASH_ADDR_LOW_MAX upper bound for crash memory,
> - * crashkernel=x,high reserves memory over 4G, also allocates
> - * 256M extra low memory for DMA buffers and swiotlb.
> + * crashkernel=x,high reserves memory over CRASH_ADDR_LOW_MAX,
> + * also allocates 256M extra low memory for DMA buffers
> + * and swiotlb.
> * But the extra memory is not required for all machines.
> * So try low memory first and fall back to high memory
> * unless "crashkernel=size[KMG],high" is specified.
> @@ -516,7 +517,7 @@ static void __init reserve_crashkernel(void)
> }
> }
>
> - if (crash_base >= (1ULL << 32) && reserve_crashkernel_low()) {
> + if (crash_base >= CRASH_ADDR_LOW_MAX && reserve_crashkernel_low()) {
> memblock_free(crash_base, crash_size);
> return;

Acked-by: Baoquan He <bhe@redhat.com>

> }
> --
> 2.20.1
>

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