[PATCH v14 03/11] x86: kdump: use macro CRASH_ADDR_LOW_MAX in functions reserve_crashkernel()
From: Chen Zhou <hidden>
Date: 2021-01-30 09:15:13
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
To make the functions reserve_crashkernel() as generic, replace some hard-coded numbers with macro CRASH_ADDR_LOW_MAX. Signed-off-by: Chen Zhou <redacted> Tested-by: John Donnelly <redacted> --- 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; }
--
2.20.1
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