summaryrefslogtreecommitdiff
path: root/arch/arm64/mm
diff options
context:
space:
mode:
authorBaoquan He <bhe@redhat.com>2023-04-07 09:15:07 +0800
committerWill Deacon <will@kernel.org>2023-04-11 19:24:46 +0100
commit504cae453f8222884486f77f1fd3e8e0aa317dd7 (patch)
tree1d5974a7312a46612d032d1aa9a09de1903da6fe /arch/arm64/mm
parent04a2a7af3d977f5a54aed26ab54cf734b59dcdf3 (diff)
arm64: kdump: defer the crashkernel reservation for platforms with no DMA memory zones
In commit 031495635b46 ("arm64: Do not defer reserve_crashkernel() for platforms with no DMA memory zones"), reserve_crashkernel() is called much earlier in arm64_memblock_init() to avoid causing base apge mapping on platforms with no DMA meomry zones. With taking off protection on crashkernel memory region, no need to call reserve_crashkernel() specially in advance. The deferred invocation of reserve_crashkernel() in bootmem_init() can cover all cases. So revert the whole commit now. Signed-off-by: Baoquan He <bhe@redhat.com> Reviewed-by: Zhen Lei <thunder.leizhen@huawei.com> Link: https://lore.kernel.org/r/20230407011507.17572-4-bhe@redhat.com Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/mm')
-rw-r--r--arch/arm64/mm/init.c34
1 files changed, 3 insertions, 31 deletions
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 58a0bb2c17f1..66e70ca47680 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -61,34 +61,8 @@ EXPORT_SYMBOL(memstart_addr);
* unless restricted on specific platforms (e.g. 30-bit on Raspberry Pi 4).
* In such case, ZONE_DMA32 covers the rest of the 32-bit addressable memory,
* otherwise it is empty.
- *
- * Memory reservation for crash kernel either done early or deferred
- * depending on DMA memory zones configs (ZONE_DMA) --
- *
- * In absence of ZONE_DMA configs arm64_dma_phys_limit initialized
- * here instead of max_zone_phys(). This lets early reservation of
- * crash kernel memory which has a dependency on arm64_dma_phys_limit.
- * Reserving memory early for crash kernel allows linear creation of block
- * mappings (greater than page-granularity) for all the memory bank rangs.
- * In this scheme a comparatively quicker boot is observed.
- *
- * If ZONE_DMA configs are defined, crash kernel memory reservation
- * is delayed until DMA zone memory range size initialization performed in
- * zone_sizes_init(). The defer is necessary to steer clear of DMA zone
- * memory range to avoid overlap allocation. So crash kernel memory boundaries
- * are not known when mapping all bank memory ranges, which otherwise means
- * not possible to exclude crash kernel range from creating block mappings
- * so page-granularity mappings are created for the entire memory range.
- * Hence a slightly slower boot is observed.
- *
- * Note: Page-granularity mappings are necessary for crash kernel memory
- * range for shrinking its size via /sys/kernel/kexec_crash_size interface.
*/
-#if IS_ENABLED(CONFIG_ZONE_DMA) || IS_ENABLED(CONFIG_ZONE_DMA32)
phys_addr_t __ro_after_init arm64_dma_phys_limit;
-#else
-phys_addr_t __ro_after_init arm64_dma_phys_limit = PHYS_MASK + 1;
-#endif
/* Current arm64 boot protocol requires 2MB alignment */
#define CRASH_ALIGN SZ_2M
@@ -248,6 +222,8 @@ static void __init zone_sizes_init(void)
if (!arm64_dma_phys_limit)
arm64_dma_phys_limit = dma32_phys_limit;
#endif
+ if (!arm64_dma_phys_limit)
+ arm64_dma_phys_limit = PHYS_MASK + 1;
max_zone_pfns[ZONE_NORMAL] = max_pfn;
free_area_init(max_zone_pfns);
@@ -408,9 +384,6 @@ void __init arm64_memblock_init(void)
early_init_fdt_scan_reserved_mem();
- if (!defer_reserve_crashkernel())
- reserve_crashkernel();
-
high_memory = __va(memblock_end_of_DRAM() - 1) + 1;
}
@@ -457,8 +430,7 @@ void __init bootmem_init(void)
* request_standard_resources() depends on crashkernel's memory being
* reserved, so do it here.
*/
- if (defer_reserve_crashkernel())
- reserve_crashkernel();
+ reserve_crashkernel();
memblock_dump_all();
}