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2a709f28fa
* 0day explit mitigation * Memory corruption prevention * Privilege escalation prevention * Buffer over flow prevention * File System corruption defense * Thread escape prevention This may very well be the most intensive inclusion to BrooklynR. This will not be part of an x86 suite nor it will be released as tool kit. The security core toolkit will remain part of kernel base.
94 lines
2.1 KiB
C
94 lines
2.1 KiB
C
#ifndef LINUX_QUICKLIST_H
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#define LINUX_QUICKLIST_H
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/*
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* Fast allocations and disposal of pages. Pages must be in the condition
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* as needed after allocation when they are freed. Per cpu lists of pages
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* are kept that only contain node local pages.
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*
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* (C) 2007, SGI. Christoph Lameter <cl@linux.com>
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*/
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#include <linux/kernel.h>
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#include <linux/gfp.h>
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#include <linux/percpu.h>
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#ifdef CONFIG_QUICKLIST
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struct quicklist {
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void *page;
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int nr_pages;
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};
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DECLARE_PER_CPU(struct quicklist, quicklist)[CONFIG_NR_QUICK];
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/*
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* The two key functions quicklist_alloc and quicklist_free are inline so
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* that they may be custom compiled for the platform.
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* Specifying a NULL ctor can remove constructor support. Specifying
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* a constant quicklist allows the determination of the exact address
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* in the per cpu area.
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*
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* The fast patch in quicklist_alloc touched only a per cpu cacheline and
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* the first cacheline of the page itself. There is minmal overhead involved.
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*/
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static inline void *quicklist_alloc(int nr, gfp_t flags, void (*ctor)(void *))
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{
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struct quicklist *q;
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void **p = NULL;
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q =&get_cpu_var(quicklist)[nr];
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p = q->page;
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if (likely(p)) {
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q->page = p[0];
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p[0] = NULL;
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q->nr_pages--;
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}
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put_cpu_var(quicklist);
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if (likely(p))
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return p;
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p = (void *)__get_free_page(flags | __GFP_ZERO);
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if (ctor && p)
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ctor(p);
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return p;
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}
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static inline void __quicklist_free(int nr, void (*dtor)(void *), void *p,
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struct page *page)
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{
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struct quicklist *q;
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q = &get_cpu_var(quicklist)[nr];
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*(void **)p = q->page;
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q->page = p;
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q->nr_pages++;
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put_cpu_var(quicklist);
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}
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static inline void quicklist_free(int nr, void (*dtor)(void *), void *pp)
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{
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__quicklist_free(nr, dtor, pp, virt_to_page(pp));
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}
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static inline void quicklist_free_page(int nr, void (*dtor)(void *),
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struct page *page)
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{
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__quicklist_free(nr, dtor, page_address(page), page);
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}
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void quicklist_trim(int nr, void (*dtor)(void *),
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unsigned long min_pages, unsigned long max_free);
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unsigned long quicklist_total_size(void);
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#else
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static inline unsigned long quicklist_total_size(void)
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{
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return 0;
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}
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#endif
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#endif /* LINUX_QUICKLIST_H */
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