Re: [PATCH v19 05/13] x86/setup: Add and use CRASH_BASE_ALIGN

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On 12/28/21 7:26 AM, Zhen Lei wrote:
Add macro CRASH_BASE_ALIGN to indicate the alignment for crash kernel
fixed region, in preparation for making partial implementation of
reserve_crashkernel[_low]() generic.

Signed-off-by: Zhen Lei <thunder.leizhen@xxxxxxxxxx>

>
Acked-by: John Donnelly  <john.p.donnelly@xxxxxxxxxx>

---
  arch/x86/kernel/setup.c | 7 +++++--
  1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 93d78aae1937db3..cb7f237a2ae0dfa 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -392,9 +392,12 @@ static void __init memblock_x86_reserve_range_setup_data(void)
#ifdef CONFIG_KEXEC_CORE -/* 16M alignment for crash kernel regions */
+/* alignment for crash kernel dynamic regions */
  #define CRASH_ALIGN		SZ_16M
+/* alignment for crash kernel fixed region */
+#define CRASH_BASE_ALIGN	SZ_1M
+
  /*
   * Keep the crash kernel below this limit.
   *
@@ -509,7 +512,7 @@ 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_BASE_ALIGN, crash_base,
  						  crash_base + crash_size);
  		if (start != crash_base) {
  			pr_info("crashkernel reservation failed - memory is in use.\n");


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