[PATCH v12 1/9] x86: kdump: move CRASH_ALIGN to 2M
From: Chen Zhou <hidden>
Date: 2020-09-07 17:21:52
Also in:
kexec, linux-doc, lkml
Subsystem:
the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
CONFIG_PHYSICAL_ALIGN can be selected from 2M to 16M and default value is 2M, so move CRASH_ALIGN to 2M, with smaller value reservation can have more chance to succeed. And replace the hard-coded alignment with macro CRASH_ALIGN in function reserve_crashkernel(). Suggested-by: Dave Young <redacted> Signed-off-by: Chen Zhou <redacted> --- 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..83f200dd54a1 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 +/* 2M alignment for crash kernel regions */ +#define CRASH_ALIGN SZ_2M + #ifndef __ASSEMBLY__ #include <linux/string.h>
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 3511736fbc74..296294ad0dd8 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c@@ -402,9 +402,6 @@ 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. *
@@ -530,7 +527,7 @@ static void __init reserve_crashkernel(void) start = memblock_find_in_range(crash_base, crash_base + crash_size, - crash_size, 1 << 20); + crash_size, CRASH_ALIGN); if (start != crash_base) { pr_info("crashkernel reservation failed - memory is in use.\n"); return;
--
2.20.1
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