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mm: hugetlb: remove minimum_order variable 

commit 641844f561 ("mm/hugetlb: introduce minimum hugepage order") fixed
a static checker warning and introduced a global variable minimum_order to
fix the warning.  However, the local variable in
dissolve_free_huge_pages() can be initialized to
huge_page_order(&default_hstate) to fix the warning.

So remove minimum_order to simplify the code.

Link: https://lkml.kernel.org/r/20220616033846.96937-1-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Muchun Song 2022-06-16 11:38:46 +08:00 committed by akpm
parent 6636109512
commit dc2628f395
1 changed files with 7 additions and 11 deletions
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18
mm/hugetlb.c
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@ -66,12 +66,6 @@ static bool hugetlb_cma_page(struct page *page, unsigned int order)
#endif
static unsigned long hugetlb_cma_size __initdata;
/*
* Minimum page order among possible hugepage sizes, set to a proper value
* at boot time.
*/
static unsigned int minimum_order __read_mostly = UINT_MAX;
__initdata LIST_HEAD(huge_boot_pages);
/* for command line parsing */
@ -2152,11 +2146,17 @@ int dissolve_free_huge_pages(unsigned long start_pfn, unsigned long end_pfn)
unsigned long pfn;
struct page *page;
int rc = 0;
unsigned int order;
struct hstate *h;
if (!hugepages_supported())
return rc;
for (pfn = start_pfn; pfn < end_pfn; pfn += 1 << minimum_order) {
order = huge_page_order(&default_hstate);
for_each_hstate(h)
order = min(order, huge_page_order(h));
for (pfn = start_pfn; pfn < end_pfn; pfn += 1 << order) {
page = pfn_to_page(pfn);
rc = dissolve_free_huge_page(page);
if (rc)
@ -3148,9 +3148,6 @@ static void __init hugetlb_init_hstates(void)
struct hstate *h, *h2;
for_each_hstate(h) {
if (minimum_order > huge_page_order(h))
minimum_order = huge_page_order(h);
/* oversize hugepages were init'ed in early boot */
if (!hstate_is_gigantic(h))
hugetlb_hstate_alloc_pages(h);
@ -3175,7 +3172,6 @@ static void __init hugetlb_init_hstates(void)
h->demote_order = h2->order;
}
}
VM_BUG_ON(minimum_order == UINT_MAX);
}
static void __init report_hugepages(void)