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https://github.com/torvalds/linux
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5e0a760b44
commit 23baf831a3 ("mm, treewide: redefine MAX_ORDER sanely") has
changed the definition of MAX_ORDER to be inclusive. This has caused
issues with code that was not yet upstream and depended on the previous
definition.
To draw attention to the altered meaning of the define, rename MAX_ORDER
to MAX_PAGE_ORDER.
Link: https://lkml.kernel.org/r/20231228144704.14033-2-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/mm.h>
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#include <linux/page-isolation.h>
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unsigned int _debug_guardpage_minorder;
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bool _debug_pagealloc_enabled_early __read_mostly
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= IS_ENABLED(CONFIG_DEBUG_PAGEALLOC_ENABLE_DEFAULT);
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EXPORT_SYMBOL(_debug_pagealloc_enabled_early);
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DEFINE_STATIC_KEY_FALSE(_debug_pagealloc_enabled);
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EXPORT_SYMBOL(_debug_pagealloc_enabled);
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DEFINE_STATIC_KEY_FALSE(_debug_guardpage_enabled);
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static int __init early_debug_pagealloc(char *buf)
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{
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return kstrtobool(buf, &_debug_pagealloc_enabled_early);
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}
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early_param("debug_pagealloc", early_debug_pagealloc);
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static int __init debug_guardpage_minorder_setup(char *buf)
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{
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unsigned long res;
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if (kstrtoul(buf, 10, &res) < 0 || res > MAX_PAGE_ORDER / 2) {
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pr_err("Bad debug_guardpage_minorder value\n");
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return 0;
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}
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_debug_guardpage_minorder = res;
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pr_info("Setting debug_guardpage_minorder to %lu\n", res);
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return 0;
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}
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early_param("debug_guardpage_minorder", debug_guardpage_minorder_setup);
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bool __set_page_guard(struct zone *zone, struct page *page, unsigned int order,
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int migratetype)
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{
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if (order >= debug_guardpage_minorder())
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return false;
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__SetPageGuard(page);
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INIT_LIST_HEAD(&page->buddy_list);
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set_page_private(page, order);
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/* Guard pages are not available for any usage */
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if (!is_migrate_isolate(migratetype))
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__mod_zone_freepage_state(zone, -(1 << order), migratetype);
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return true;
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}
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void __clear_page_guard(struct zone *zone, struct page *page, unsigned int order,
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int migratetype)
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{
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__ClearPageGuard(page);
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set_page_private(page, 0);
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if (!is_migrate_isolate(migratetype))
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__mod_zone_freepage_state(zone, (1 << order), migratetype);
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}
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