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Subject[PATCH] memory hotplug: update the variables after memory removed
Commit ea0854170c95245a258b386c7a9314399c949fe0 added a fuction
update_end_of_memory_vars() to update high_memory, max_pfn and
max_low_pfn.

Here modified the function(added an argument to show add or remove).
And call it in arch_remove_memory() to update these variables too.

Signed-off-by: Zhang Zhen <zhenzhang.zhang@huawei.com>
---
arch/x86/mm/init_64.c | 29 +++++++++++++++++++++--------
1 file changed, 21 insertions(+), 8 deletions(-)

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index df1a992..2557091 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -673,14 +673,24 @@ void __init paging_init(void)
* After memory hotplug the variables max_pfn, max_low_pfn and high_memory need
* updating.
*/
-static void update_end_of_memory_vars(u64 start, u64 size)
+static void update_end_of_memory_vars(u64 start, u64 size, bool flag)
{
- unsigned long end_pfn = PFN_UP(start + size);
-
- if (end_pfn > max_pfn) {
- max_pfn = end_pfn;
- max_low_pfn = end_pfn;
- high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
+ unsigned long end_pfn;
+
+ if (flag) {
+ end_pfn = PFN_UP(start + size);
+ if (end_pfn > max_pfn) {
+ max_pfn = end_pfn;
+ max_low_pfn = end_pfn;
+ high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
+ }
+ } else {
+ end_pfn = PFN_UP(start);
+ if (end_pfn < max_pfn) {
+ max_pfn = end_pfn;
+ max_low_pfn = end_pfn;
+ high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
+ }
}
}

@@ -702,7 +712,7 @@ int arch_add_memory(int nid, u64 start, u64 size)
WARN_ON_ONCE(ret);

/* update max_pfn, max_low_pfn and high_memory */
- update_end_of_memory_vars(start, size);
+ update_end_of_memory_vars(start, size, true);

return ret;
}
@@ -1025,6 +1035,9 @@ int __ref arch_remove_memory(u64 start, u64 size)
ret = __remove_pages(zone, start_pfn, nr_pages);
WARN_ON_ONCE(ret);

+ /* update max_pfn, max_low_pfn and high_memory */
+ update_end_of_memory_vars(start, size, false);
+
return ret;
}
#endif
--
1.8.1.2

.






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