parisc: Call pagefault_disable/pagefault_enable in kmap_atomic/kunmap_atomic
Based on the generic implementation of kmap_atomic and kunmap_atomic, we should call pagefault_disable and pagefault_enable in our PA8000 implementation. The define for kmap_atomic_prot was also missing, and I updated kmap_atomic_pfn to use the generic implementation because of the change to kmap_atomic. I believe that this change is needed to fix the fork copy-on-write bug. Signed-off-by: John David Anglin <dave.anglin@nrc-cnrc.gc.ca> Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
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1 changed files with 13 additions and 3 deletions
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@ -2,6 +2,7 @@
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#define _PARISC_CACHEFLUSH_H
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#define _PARISC_CACHEFLUSH_H
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#include <linux/mm.h>
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#include <linux/mm.h>
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#include <linux/uaccess.h>
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/* The usual comment is "Caches aren't brain-dead on the <architecture>".
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/* The usual comment is "Caches aren't brain-dead on the <architecture>".
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* Unfortunately, that doesn't apply to PA-RISC. */
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* Unfortunately, that doesn't apply to PA-RISC. */
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@ -125,11 +126,20 @@ static inline void *kmap(struct page *page)
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#define kunmap(page) kunmap_parisc(page_address(page))
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#define kunmap(page) kunmap_parisc(page_address(page))
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#define kmap_atomic(page, idx) page_address(page)
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static inline void *kmap_atomic(struct page *page, enum km_type idx)
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{
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pagefault_disable();
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return page_address(page);
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}
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#define kunmap_atomic(addr, idx) kunmap_parisc(addr)
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static inline void kunmap_atomic(void *addr, enum km_type idx)
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{
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kunmap_parisc(addr);
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pagefault_enable();
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}
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#define kmap_atomic_pfn(pfn, idx) page_address(pfn_to_page(pfn))
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#define kmap_atomic_prot(page, idx, prot) kmap_atomic(page, idx)
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#define kmap_atomic_pfn(pfn, idx) kmap_atomic(pfn_to_page(pfn), (idx))
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#define kmap_atomic_to_page(ptr) virt_to_page(ptr)
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#define kmap_atomic_to_page(ptr) virt_to_page(ptr)
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#endif
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#endif
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