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x86: pat.c choose more crisp variable names
- parse/ml => entry (within list_for_each and friends) - new_entry => new - ret_type => new_type (to avoid confusion with req_type) (... to make it more readable...) Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com> Cc: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Cc: Suresh B Siddha <suresh.b.siddha@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Andreas Herrmann
Ingo Molnar
parent
bcc643dc28
commit
ac97991ec9
@ -188,37 +188,34 @@ static unsigned long pat_x_mtrr_type(u64 start, u64 end, unsigned long req_type)
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* req_type will have a special case value '-1', when requester want to inherit
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* the memory type from mtrr (if WB), existing PAT, defaulting to UC_MINUS.
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*
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* If ret_type is NULL, function will return an error if it cannot reserve the
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* region with req_type. If ret_type is non-null, function will return
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* available type in ret_type in case of no error. In case of any error
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* If new_type is NULL, function will return an error if it cannot reserve the
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* region with req_type. If new_type is non-NULL, function will return
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* available type in new_type in case of no error. In case of any error
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* it will return a negative return value.
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*/
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int reserve_memtype(u64 start, u64 end, unsigned long req_type,
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unsigned long *ret_type)
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unsigned long *new_type)
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{
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struct memtype *new_entry = NULL;
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struct memtype *parse;
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struct memtype *new, *entry;
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unsigned long actual_type;
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int err = 0;
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/* Only track when pat_enabled */
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if (!pat_enabled) {
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/* This is identical to page table setting without PAT */
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if (ret_type) {
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if (req_type == -1) {
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*ret_type = _PAGE_CACHE_WB;
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} else {
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*ret_type = req_type & _PAGE_CACHE_MASK;
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}
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if (new_type) {
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if (req_type == -1)
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*new_type = _PAGE_CACHE_WB;
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else
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*new_type = req_type & _PAGE_CACHE_MASK;
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}
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return 0;
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}
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/* Low ISA region is always mapped WB in page table. No need to track */
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if (is_ISA_range(start, end - 1)) {
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if (ret_type)
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*ret_type = _PAGE_CACHE_WB;
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if (new_type)
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*new_type = _PAGE_CACHE_WB;
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return 0;
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}
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@ -243,65 +240,65 @@ int reserve_memtype(u64 start, u64 end, unsigned long req_type,
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actual_type = pat_x_mtrr_type(start, end, req_type);
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}
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new_entry = kmalloc(sizeof(struct memtype), GFP_KERNEL);
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if (!new_entry)
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new = kmalloc(sizeof(struct memtype), GFP_KERNEL);
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if (!new)
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return -ENOMEM;
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new_entry->start = start;
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new_entry->end = end;
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new_entry->type = actual_type;
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new->start = start;
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new->end = end;
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new->type = actual_type;
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if (ret_type)
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*ret_type = actual_type;
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if (new_type)
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*new_type = actual_type;
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spin_lock(&memtype_lock);
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/* Search for existing mapping that overlaps the current range */
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list_for_each_entry(parse, &memtype_list, nd) {
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list_for_each_entry(entry, &memtype_list, nd) {
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struct memtype *saved_ptr;
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if (parse->start >= end) {
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if (entry->start >= end) {
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dprintk("New Entry\n");
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list_add(&new_entry->nd, parse->nd.prev);
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new_entry = NULL;
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list_add(&new->nd, entry->nd.prev);
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new = NULL;
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break;
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}
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if (start <= parse->start && end >= parse->start) {
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if (actual_type != parse->type && ret_type) {
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actual_type = parse->type;
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*ret_type = actual_type;
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new_entry->type = actual_type;
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if (start <= entry->start && end >= entry->start) {
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if (actual_type != entry->type && new_type) {
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actual_type = entry->type;
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*new_type = actual_type;
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new->type = actual_type;
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}
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if (actual_type != parse->type) {
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if (actual_type != entry->type) {
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printk(
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KERN_INFO "%s:%d conflicting memory types %Lx-%Lx %s<->%s\n",
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current->comm, current->pid,
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start, end,
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cattr_name(actual_type),
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cattr_name(parse->type));
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cattr_name(entry->type));
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err = -EBUSY;
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break;
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}
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saved_ptr = parse;
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saved_ptr = entry;
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/*
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* Check to see whether the request overlaps more
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* than one entry in the list
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*/
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list_for_each_entry_continue(parse, &memtype_list, nd) {
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if (end <= parse->start) {
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list_for_each_entry_continue(entry, &memtype_list, nd) {
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if (end <= entry->start) {
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break;
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}
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if (actual_type != parse->type) {
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if (actual_type != entry->type) {
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printk(
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KERN_INFO "%s:%d conflicting memory types %Lx-%Lx %s<->%s\n",
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current->comm, current->pid,
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start, end,
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cattr_name(actual_type),
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cattr_name(parse->type));
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cattr_name(entry->type));
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err = -EBUSY;
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break;
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}
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@ -314,46 +311,46 @@ int reserve_memtype(u64 start, u64 end, unsigned long req_type,
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dprintk("Overlap at 0x%Lx-0x%Lx\n",
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saved_ptr->start, saved_ptr->end);
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/* No conflict. Go ahead and add this new entry */
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list_add(&new_entry->nd, saved_ptr->nd.prev);
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new_entry = NULL;
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list_add(&new->nd, saved_ptr->nd.prev);
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new = NULL;
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break;
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}
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if (start < parse->end) {
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if (actual_type != parse->type && ret_type) {
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actual_type = parse->type;
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*ret_type = actual_type;
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new_entry->type = actual_type;
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if (start < entry->end) {
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if (actual_type != entry->type && new_type) {
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actual_type = entry->type;
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*new_type = actual_type;
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new->type = actual_type;
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}
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if (actual_type != parse->type) {
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if (actual_type != entry->type) {
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printk(
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KERN_INFO "%s:%d conflicting memory types %Lx-%Lx %s<->%s\n",
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current->comm, current->pid,
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start, end,
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cattr_name(actual_type),
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cattr_name(parse->type));
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cattr_name(entry->type));
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err = -EBUSY;
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break;
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}
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saved_ptr = parse;
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saved_ptr = entry;
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/*
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* Check to see whether the request overlaps more
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* than one entry in the list
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*/
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list_for_each_entry_continue(parse, &memtype_list, nd) {
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if (end <= parse->start) {
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list_for_each_entry_continue(entry, &memtype_list, nd) {
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if (end <= entry->start) {
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break;
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}
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if (actual_type != parse->type) {
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if (actual_type != entry->type) {
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printk(
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KERN_INFO "%s:%d conflicting memory types %Lx-%Lx %s<->%s\n",
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current->comm, current->pid,
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start, end,
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cattr_name(actual_type),
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cattr_name(parse->type));
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cattr_name(entry->type));
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err = -EBUSY;
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break;
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}
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@ -366,8 +363,8 @@ int reserve_memtype(u64 start, u64 end, unsigned long req_type,
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dprintk("Overlap at 0x%Lx-0x%Lx\n",
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saved_ptr->start, saved_ptr->end);
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/* No conflict. Go ahead and add this new entry */
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list_add(&new_entry->nd, &saved_ptr->nd);
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new_entry = NULL;
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list_add(&new->nd, &saved_ptr->nd);
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new = NULL;
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break;
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}
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}
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@ -375,24 +372,24 @@ int reserve_memtype(u64 start, u64 end, unsigned long req_type,
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if (err) {
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printk(KERN_INFO
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"reserve_memtype failed 0x%Lx-0x%Lx, track %s, req %s\n",
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start, end, cattr_name(new_entry->type),
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start, end, cattr_name(new->type),
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cattr_name(req_type));
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kfree(new_entry);
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kfree(new);
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spin_unlock(&memtype_lock);
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return err;
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}
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if (new_entry) {
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if (new) {
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/* No conflict. Not yet added to the list. Add to the tail */
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list_add_tail(&new_entry->nd, &memtype_list);
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list_add_tail(&new->nd, &memtype_list);
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dprintk("New Entry\n");
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}
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if (ret_type) {
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if (new_type) {
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dprintk(
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"reserve_memtype added 0x%Lx-0x%Lx, track %s, req %s, ret %s\n",
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start, end, cattr_name(actual_type),
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cattr_name(req_type), cattr_name(*ret_type));
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cattr_name(req_type), cattr_name(*new_type));
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} else {
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dprintk(
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"reserve_memtype added 0x%Lx-0x%Lx, track %s, req %s\n",
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@ -406,7 +403,7 @@ int reserve_memtype(u64 start, u64 end, unsigned long req_type,
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int free_memtype(u64 start, u64 end)
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{
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struct memtype *ml;
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struct memtype *entry;
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int err = -EINVAL;
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/* Only track when pat_enabled */
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@ -419,10 +416,10 @@ int free_memtype(u64 start, u64 end)
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return 0;
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spin_lock(&memtype_lock);
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list_for_each_entry(ml, &memtype_list, nd) {
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if (ml->start == start && ml->end == end) {
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list_del(&ml->nd);
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kfree(ml);
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list_for_each_entry(entry, &memtype_list, nd) {
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if (entry->start == start && entry->end == end) {
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list_del(&entry->nd);
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kfree(entry);
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err = 0;
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break;
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}
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