Refactor e820__range_remove with the introduction of e820_remover_data, indented to be used as the void pointer in the e820_entry_updater callbacks, and the implementation of the callbacks remove a range in the e820_table.
Signed-off-by: Martin Fernandez martin.fernandez@eclypsium.com --- arch/x86/kernel/e820.c | 94 ++++++++++++++++++------------------------ 1 file changed, 41 insertions(+), 53 deletions(-)
diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c index 36a22c0a2199..0e5aa13ebdb8 100644 --- a/arch/x86/kernel/e820.c +++ b/arch/x86/kernel/e820.c @@ -669,66 +669,54 @@ static u64 __init e820__range_update_kexec(u64 start, u64 size, return __e820__range_update(e820_table_kexec, start, size, old_type, new_type); }
-/* Remove a range of memory from the E820 table: */ -u64 __init e820__range_remove(u64 start, u64 size, enum e820_type old_type, bool check_type) -{ - int i; - u64 end; - u64 real_removed_size = 0; - - if (size > (ULLONG_MAX - start)) - size = ULLONG_MAX - start; - - end = start + size; - printk(KERN_DEBUG "e820: remove [mem %#010Lx-%#010Lx] ", start, end - 1); - if (check_type) - e820_print_type(old_type); - pr_cont("\n"); - - for (i = 0; i < e820_table->nr_entries; i++) { - struct e820_entry *entry = &e820_table->entries[i]; - u64 final_start, final_end; - u64 entry_end; - - if (check_type && entry->type != old_type) - continue; +/* + * Type helper for the e820_entry_updater callbacks. + */ +struct e820_remover_data { + enum e820_type old_type; + bool check_type; +};
- entry_end = entry->addr + entry->size; +static bool __init remover__should_update(const struct e820_entry *entry, + const void *data) +{ + const struct e820_remover_data *remover_data = data;
- /* Completely covered? */ - if (entry->addr >= start && entry_end <= end) { - real_removed_size += entry->size; - memset(entry, 0, sizeof(*entry)); - continue; - } + return !remover_data->check_type || + entry->type == remover_data->old_type; +}
- /* Is the new range completely covered? */ - if (entry->addr < start && entry_end > end) { - e820__range_add(end, entry_end - end, entry->type); - entry->size = start - entry->addr; - real_removed_size += size; - continue; - } +static void __init remover__update(struct e820_entry *entry, const void *data) +{ + memset(entry, 0, sizeof(*entry)); +}
- /* Partially covered: */ - final_start = max(start, entry->addr); - final_end = min(end, entry_end); - if (final_start >= final_end) - continue; +/* + * Remove [@start, @start + @size) from e820_table. If @check_type is + * true remove only entries with type @old_type. + */ +u64 __init e820__range_remove(u64 start, u64 size, enum e820_type old_type, + bool check_type) +{ + struct e820_entry_updater updater = { + .should_update = remover__should_update, + .update = remover__update, + .new = NULL + };
- real_removed_size += final_end - final_start; + struct e820_remover_data data = { + .check_type = check_type, + .old_type = old_type + };
- /* - * Left range could be head or tail, so need to update - * the size first: - */ - entry->size -= final_end - final_start; - if (entry->addr < final_start) - continue; + printk(KERN_DEBUG "e820: remove [mem %#018Lx-%#018Lx] ", start, + start + size - 1); + if (check_type) + e820_print_type(old_type); + pr_cont("\n");
- entry->addr = final_end; - } - return real_removed_size; + return __e820__handle_range_update(e820_table, start, size, &updater, + &data); }
void __init e820__update_table_print(void)