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SubjectRe: [PATCH 1/2] x86/boot/KASLR: Add two functions for 1GB huge pages handling
On 06/21/18 at 05:01pm, Ingo Molnar wrote:
>
> * Baoquan He <bhe@redhat.com> wrote:
>
> > +/* Store the number of 1GB huge pages which user specified.*/
> > +static unsigned long max_gb_huge_pages;
> > +
> > +static int parse_gb_huge_pages(char *param, char* val)
> > +{
> > + char *p;
> > + u64 mem_size;
> > + static bool gbpage_sz = false;
> > +
> > + if (!strcmp(param, "hugepagesz")) {
> > + p = val;
> > + mem_size = memparse(p, &p);
> > + if (mem_size == PUD_SIZE) {
> > + if (gbpage_sz)
> > + warn("Repeadly set hugeTLB page size of 1G!\n");
> > + gbpage_sz = true;
> > + } else
> > + gbpage_sz = false;
> > + } else if (!strcmp(param, "hugepages") && gbpage_sz) {
> > + p = val;
> > + max_gb_huge_pages = simple_strtoull(p, &p, 0);
> > + debug_putaddr(max_gb_huge_pages);
> > + }
> > +}
>
> This function has at least one style problem and one typo.
>
> Also, we don't put statics in the middle of function variable blocks.
>

Sorry, I will check all of them carefully and repost according to your
comments.

> > +/* Skip as many 1GB huge pages as possible in the passed region. */
> > +static void process_gb_huge_page(struct mem_vector *region, unsigned long image_size)
> > +{
> > + int i = 0;
> > + unsigned long addr, size;
> > + struct mem_vector tmp;
> > +
> > + if (!max_gb_huge_pages) {
> > + store_slot_info(region, image_size);
> > + return;
> > + }
> > +
> > + addr = ALIGN(region->start, PUD_SIZE);
> > + /* If Did we raise the address above the passed in memory entry? */
> > + if (addr < region->start + region->size)
> > + size = region->size - (addr - region->start);
> > +
> > + /* Check how many 1GB huge pages can be filtered out*/
> > + while (size > PUD_SIZE && max_gb_huge_pages) {
> > + size -= PUD_SIZE;
> > + max_gb_huge_pages--;
> > + i++;
> > + }
> > +
> > + if (!i) {
> > + store_slot_info(region, image_size);
> > + return;
> > + }
> > +
> > + /* Process the remaining regions after filtering out. */
> > +
> > + if (addr >= region->start + image_size) {
> > + tmp.start = region->start;
> > + tmp.size = addr - region->start;
> > + store_slot_info(&tmp, image_size);
> > + }
> > +
> > + size = region->size - (addr - region->start) - i * PUD_SIZE;
> > + if (size >= image_size) {
> > + tmp.start = addr + i*PUD_SIZE;
> > + tmp.size = size;
> > + store_slot_info(&tmp, image_size);
> > + }
> > +}
>
> I counted about 5 style problems and at least one typo in this function ...
>
> Please review the code you are submitting more carefully for small details as
> well.
>
> Thanks,
>
> Ingo

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