I got some scheduling while atomic on x86-64 , and since x86-64 doesn't seem
to have HIGHMEM there's no workaround for kmap_atomic() .
This patch adds the same as i386 HIGHMEM for !HIGHMEM.
Signed-Off-By: Daniel Walker <[email protected]>
---
include/linux/highmem.h | 14 +++++++++++++-
1 files changed, 13 insertions(+), 1 deletion(-)
Index: linux-2.6.19/include/linux/highmem.h
===================================================================
--- linux-2.6.19.orig/include/linux/highmem.h
+++ linux-2.6.19/include/linux/highmem.h
@@ -42,13 +42,25 @@ static inline void *kmap(struct page *pa
#define kunmap(page) do { (void) (page); } while (0)
+#ifdef CONFIG_PREEMPT_RT
+/*
+ * kmap and kmunmap are above, and they don't really do anything
+ * interesting.
+ */
+# define kmap_atomic(page, idx) kmap(page)
+# define kmap_atomic_pfn(pfn, idx) kmap(pfn_to_page(pfn))
+# define kunmap_atomic(kvaddr, idx) kunmap(kvaddr)
+#else
#define kmap_atomic(page, idx) \
({ pagefault_disable(); page_address(page); })
#define kunmap_atomic(addr, idx) do { pagefault_enable(); } while (0)
#define kmap_atomic_pfn(pfn, idx) kmap_atomic(pfn_to_page(pfn), (idx))
-#define kmap_atomic_to_page(ptr) virt_to_page(ptr)
#endif
+#define kmap_atomic_to_page(ptr) virt_to_page(ptr)
+
+#endif /* ARCH_HAS_KMAP */
+
#endif /* CONFIG_HIGHMEM */
/* when CONFIG_HIGHMEM is not set these will be plain clear/copy_page */
--
-
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