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From 2572b8d702e452624bdb8d7b7c39f458e7dcf2ce Mon Sep 17 00:00:00 2001
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From: AKASHI Takahiro <takahiro.akashi@linaro.org>
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Date: Wed, 18 Dec 2019 11:42:32 -0500
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Subject: [PATCH 3/3] arm64: kdump: deal with a lot of resource entries in
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/proc/iomem
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As described in the commit ("arm64: kexec: allocate memory space avoiding
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reserved regions"), /proc/iomem now has a lot of "reserved" entries, and
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it's not just enough to have a fixed size of memory range array.
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With this patch, kdump is allowed to handle arbitrary number of memory
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ranges, using mem_regions_alloc_and_xxx() functions.
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Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
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Tested-by: Bhupesh Sharma <bhsharma@redhat.com>
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Tested-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
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Signed-off-by: Simon Horman <horms@verge.net.au>
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---
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kexec/arch/arm64/crashdump-arm64.c | 25 ++++++++++---------------
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1 file changed, 10 insertions(+), 15 deletions(-)
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diff --git a/kexec/arch/arm64/crashdump-arm64.c b/kexec/arch/arm64/crashdump-arm64.c
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index 4fd7aa8fd43c..38d1a0f3000d 100644
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--- a/kexec/arch/arm64/crashdump-arm64.c
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+++ b/kexec/arch/arm64/crashdump-arm64.c
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@@ -23,13 +23,8 @@
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#include "kexec-elf.h"
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#include "mem_regions.h"
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-/* memory ranges on crashed kernel */
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-static struct memory_range system_memory_ranges[CRASH_MAX_MEMORY_RANGES];
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-static struct memory_ranges system_memory_rgns = {
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- .size = 0,
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- .max_size = CRASH_MAX_MEMORY_RANGES,
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- .ranges = system_memory_ranges,
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-};
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+/* memory ranges of crashed kernel */
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+static struct memory_ranges system_memory_rgns;
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/* memory range reserved for crashkernel */
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struct memory_range crash_reserved_mem;
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@@ -82,7 +77,7 @@ static uint64_t get_kernel_page_offset(void)
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*
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* This function is called once for each memory region found in /proc/iomem.
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* It locates system RAM and crashkernel reserved memory and places these to
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- * variables, respectively, system_memory_ranges and crash_reserved_mem.
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+ * variables, respectively, system_memory_rgns and usablemem_rgns.
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*/
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static int iomem_range_callback(void *UNUSED(data), int UNUSED(nr),
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@@ -90,11 +85,11 @@ static int iomem_range_callback(void *UNUSED(data), int UNUSED(nr),
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unsigned long long length)
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{
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if (strncmp(str, CRASH_KERNEL, strlen(CRASH_KERNEL)) == 0)
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- return mem_regions_add(&usablemem_rgns,
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- base, length, RANGE_RAM);
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+ return mem_regions_alloc_and_add(&usablemem_rgns,
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+ base, length, RANGE_RAM);
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else if (strncmp(str, SYSTEM_RAM, strlen(SYSTEM_RAM)) == 0)
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- return mem_regions_add(&system_memory_rgns,
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- base, length, RANGE_RAM);
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+ return mem_regions_alloc_and_add(&system_memory_rgns,
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+ base, length, RANGE_RAM);
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else if (strncmp(str, KERNEL_CODE, strlen(KERNEL_CODE)) == 0)
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elf_info.kern_paddr_start = base;
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else if (strncmp(str, KERNEL_DATA, strlen(KERNEL_DATA)) == 0)
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@@ -135,9 +130,9 @@ static int crash_get_memory_ranges(void)
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dbgprint_mem_range("Reserved memory range", &crash_reserved_mem, 1);
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- if (mem_regions_exclude(&system_memory_rgns, &crash_reserved_mem)) {
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- fprintf(stderr,
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- "Error: Number of crash memory ranges excedeed the max limit\n");
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+ if (mem_regions_alloc_and_exclude(&system_memory_rgns,
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+ &crash_reserved_mem)) {
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+ fprintf(stderr, "Cannot allocate memory for ranges\n");
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return -ENOMEM;
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}
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--
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2.7.4
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