debug-pagealloc: add support for highmem pages
This adds support for highmem pages poisoning and verification to the debug-pagealloc feature for no-architecture support. [akpm@linux-foundation.org: remove unneeded preempt_disable/enable] Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -1,6 +1,7 @@
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#include <linux/kernel.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/mm.h>
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#include <linux/highmem.h>
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#include <linux/page-debug-flags.h>
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#include <linux/page-debug-flags.h>
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#include <linux/poison.h>
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#include <linux/poison.h>
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#include <linux/ratelimit.h>
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#include <linux/ratelimit.h>
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@ -20,28 +21,13 @@ static inline bool page_poison(struct page *page)
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return test_bit(PAGE_DEBUG_FLAG_POISON, &page->debug_flags);
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return test_bit(PAGE_DEBUG_FLAG_POISON, &page->debug_flags);
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}
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}
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static void poison_highpage(struct page *page)
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{
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/*
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* Page poisoning for highmem pages is not implemented.
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*
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* This can be called from interrupt contexts.
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* So we need to create a new kmap_atomic slot for this
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* application and it will need interrupt protection.
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*/
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}
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static void poison_page(struct page *page)
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static void poison_page(struct page *page)
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{
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{
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void *addr;
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void *addr = kmap_atomic(page);
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if (PageHighMem(page)) {
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poison_highpage(page);
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return;
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}
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set_page_poison(page);
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set_page_poison(page);
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addr = page_address(page);
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memset(addr, PAGE_POISON, PAGE_SIZE);
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memset(addr, PAGE_POISON, PAGE_SIZE);
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kunmap_atomic(addr);
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}
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}
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static void poison_pages(struct page *page, int n)
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static void poison_pages(struct page *page, int n)
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@ -86,27 +72,17 @@ static void check_poison_mem(unsigned char *mem, size_t bytes)
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dump_stack();
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dump_stack();
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}
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}
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static void unpoison_highpage(struct page *page)
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{
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/*
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* See comment in poison_highpage().
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* Highmem pages should not be poisoned for now
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*/
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BUG_ON(page_poison(page));
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}
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static void unpoison_page(struct page *page)
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static void unpoison_page(struct page *page)
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{
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{
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if (PageHighMem(page)) {
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void *addr;
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unpoison_highpage(page);
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return;
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}
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if (page_poison(page)) {
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void *addr = page_address(page);
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check_poison_mem(addr, PAGE_SIZE);
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if (!page_poison(page))
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clear_page_poison(page);
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return;
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}
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addr = kmap_atomic(page);
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check_poison_mem(addr, PAGE_SIZE);
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clear_page_poison(page);
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kunmap_atomic(addr);
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}
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}
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static void unpoison_pages(struct page *page, int n)
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static void unpoison_pages(struct page *page, int n)
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