Re: [PATCH 2/9] arc: update comment about HIGHMEM implementation
On 02.06.21 12:53, Mike Rapoport wrote: From: Mike Rapoport Arc does not use DISCONTIGMEM to implement high memory, update the comment describing how high memory works to reflect this. Signed-off-by: Mike Rapoport --- arch/arc/mm/init.c | 13 + 1 file changed, 5 insertions(+), 8 deletions(-) diff --git a/arch/arc/mm/init.c b/arch/arc/mm/init.c index e2ed355438c9..397a201adfe3 100644 --- a/arch/arc/mm/init.c +++ b/arch/arc/mm/init.c @@ -139,16 +139,13 @@ void __init setup_arch_memory(void) #ifdef CONFIG_HIGHMEM /* -* Populate a new node with highmem -* * On ARC (w/o PAE) HIGHMEM addresses are actually smaller (0 based) -* than addresses in normal ala low memory (0x8000_ based). +* than addresses in normal aka low memory (0x8000_ based). * Even with PAE, the huge peripheral space hole would waste a lot of -* mem with single mem_map[]. This warrants a mem_map per region design. -* Thus HIGHMEM on ARC is imlemented with DISCONTIGMEM. -* -* DISCONTIGMEM in turns requires multiple nodes. node 0 above is -* populated with normal memory zone while node 1 only has highmem +* mem with single contiguous mem_map[]. +* Thus when HIGHMEM on ARC is enabled the memory map corresponding +* to the hole is freed and ARC specific version of pfn_valid() +* handles the hole in the memory map. */ #ifdef CONFIG_DISCONTIGMEM node_set_online(1); Reviewed-by: David Hildenbrand -- Thanks, David / dhildenb ___ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec
[PATCH 2/9] arc: update comment about HIGHMEM implementation
From: Mike Rapoport Arc does not use DISCONTIGMEM to implement high memory, update the comment describing how high memory works to reflect this. Signed-off-by: Mike Rapoport --- arch/arc/mm/init.c | 13 + 1 file changed, 5 insertions(+), 8 deletions(-) diff --git a/arch/arc/mm/init.c b/arch/arc/mm/init.c index e2ed355438c9..397a201adfe3 100644 --- a/arch/arc/mm/init.c +++ b/arch/arc/mm/init.c @@ -139,16 +139,13 @@ void __init setup_arch_memory(void) #ifdef CONFIG_HIGHMEM /* -* Populate a new node with highmem -* * On ARC (w/o PAE) HIGHMEM addresses are actually smaller (0 based) -* than addresses in normal ala low memory (0x8000_ based). +* than addresses in normal aka low memory (0x8000_ based). * Even with PAE, the huge peripheral space hole would waste a lot of -* mem with single mem_map[]. This warrants a mem_map per region design. -* Thus HIGHMEM on ARC is imlemented with DISCONTIGMEM. -* -* DISCONTIGMEM in turns requires multiple nodes. node 0 above is -* populated with normal memory zone while node 1 only has highmem +* mem with single contiguous mem_map[]. +* Thus when HIGHMEM on ARC is enabled the memory map corresponding +* to the hole is freed and ARC specific version of pfn_valid() +* handles the hole in the memory map. */ #ifdef CONFIG_DISCONTIGMEM node_set_online(1); -- 2.28.0 ___ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec
