linux-kernel - [PATCH v19 05/13] x86/setup: Add and use CRASH_BASE

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Date:   Tue, 28 Dec 2021 21:26:04 +0800
From:   Zhen Lei <thunder.leizhen@...wei.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        <x86@...nel.org>, "H . Peter Anvin" <hpa@...or.com>,
        <linux-kernel@...r.kernel.org>, Dave Young <dyoung@...hat.com>,
        Baoquan He <bhe@...hat.com>, Vivek Goyal <vgoyal@...hat.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        <kexec@...ts.infradead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        "Will Deacon" <will@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        <devicetree@...r.kernel.org>, Jonathan Corbet <corbet@....net>,
        <linux-doc@...r.kernel.org>
CC:     Zhen Lei <thunder.leizhen@...wei.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Feng Zhou <zhoufeng.zf@...edance.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Chen Zhou <dingguo.cz@...group.com>,
        "John Donnelly" <John.p.donnelly@...cle.com>
Subject: [PATCH v19 05/13] x86/setup: Add and use CRASH_BASE_ALIGN

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@...wei.com>
---
 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");
-- 
2.25.1