powerpc/mm: Make k(un)map_atomic out of line

Those functions are way too big to be inline, besides, kmap_atomic()
wants to call debug_kmap_atomic() which isn't exported for modules
and causes module link failures.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/include/asm/highmem.h b/arch/powerpc/include/asm/highmem.h
index 684a73f..a74c4ee 100644 (file)
--- a/arch/powerpc/include/asm/highmem.h
+++ b/arch/powerpc/include/asm/highmem.h
@@ -22,9 +22,7 @@
 
 #ifdef __KERNEL__
 
-#include <linux/init.h>
 #include <linux/interrupt.h>
-#include <linux/highmem.h>
 #include <asm/kmap_types.h>
 #include <asm/tlbflush.h>
 #include <asm/page.h>
@@ -62,6 +60,9 @@ extern pte_t *pkmap_page_table;
 
 extern void *kmap_high(struct page *page);
 extern void kunmap_high(struct page *page);
+extern void *kmap_atomic_prot(struct page *page, enum km_type type,
+                             pgprot_t prot);
+extern void kunmap_atomic(void *kvaddr, enum km_type type);
 
 static inline void *kmap(struct page *page)
 {
@@ -79,62 +80,11 @@ static inline void kunmap(struct page *page)
        kunmap_high(page);
 }
 
-/*
- * The use of kmap_atomic/kunmap_atomic is discouraged - kmap/kunmap
- * gives a more generic (and caching) interface. But kmap_atomic can
- * be used in IRQ contexts, so in some (very limited) cases we need
- * it.
- */
-static inline void *kmap_atomic_prot(struct page *page, enum km_type type, pgprot_t prot)
-{
-       unsigned int idx;
-       unsigned long vaddr;
-
-       /* even !CONFIG_PREEMPT needs this, for in_atomic in do_page_fault */
-       pagefault_disable();
-       if (!PageHighMem(page))
-               return page_address(page);
-
-       debug_kmap_atomic(type);
-       idx = type + KM_TYPE_NR*smp_processor_id();
-       vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
-#ifdef CONFIG_DEBUG_HIGHMEM
-       BUG_ON(!pte_none(*(kmap_pte-idx)));
-#endif
-       __set_pte_at(&init_mm, vaddr, kmap_pte-idx, mk_pte(page, prot), 1);
-       local_flush_tlb_page(NULL, vaddr);
-
-       return (void*) vaddr;
-}
-
 static inline void *kmap_atomic(struct page *page, enum km_type type)
 {
        return kmap_atomic_prot(page, type, kmap_prot);
 }
 
-static inline void kunmap_atomic(void *kvaddr, enum km_type type)
-{
-#ifdef CONFIG_DEBUG_HIGHMEM
-       unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK;
-       enum fixed_addresses idx = type + KM_TYPE_NR*smp_processor_id();
-
-       if (vaddr < __fix_to_virt(FIX_KMAP_END)) {
-               pagefault_enable();
-               return;
-       }
-
-       BUG_ON(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx));
-
-       /*
-        * force other mappings to Oops if they'll try to access
-        * this pte without first remap it
-        */
-       pte_clear(&init_mm, vaddr, kmap_pte-idx);
-       local_flush_tlb_page(NULL, vaddr);
-#endif
-       pagefault_enable();
-}
-
 static inline struct page *kmap_atomic_to_page(void *ptr)
 {
        unsigned long idx, vaddr = (unsigned long) ptr;
@@ -148,6 +98,7 @@ static inline struct page *kmap_atomic_to_page(void *ptr)
        return pte_page(*pte);
 }
 
+
 #define flush_cache_kmaps()    flush_cache_all()
 
 #endif /* __KERNEL__ */

diff --git a/arch/powerpc/mm/Makefile b/arch/powerpc/mm/Makefile
index 2d2192e..3e68363 100644 (file)
--- a/arch/powerpc/mm/Makefile
+++ b/arch/powerpc/mm/Makefile
@@ -30,3 +30,4 @@ obj-$(CONFIG_PPC_MM_SLICES)   += slice.o
 obj-$(CONFIG_HUGETLB_PAGE)     += hugetlbpage.o
 obj-$(CONFIG_PPC_SUBPAGE_PROT) += subpage-prot.o
 obj-$(CONFIG_NOT_COHERENT_CACHE) += dma-noncoherent.o
+obj-$(CONFIG_HIGHMEM)          += highmem.o

diff --git a/arch/powerpc/mm/highmem.c b/arch/powerpc/mm/highmem.c
new file mode 100644 (file)
index 0000000..c2186c7
--- /dev/null
+++ b/arch/powerpc/mm/highmem.c
@@ -0,0 +1,77 @@
+/*
+ * highmem.c: virtual kernel memory mappings for high memory
+ *
+ * PowerPC version, stolen from the i386 version.
+ *
+ * Used in CONFIG_HIGHMEM systems for memory pages which
+ * are not addressable by direct kernel virtual addresses.
+ *
+ * Copyright (C) 1999 Gerhard Wichert, Siemens AG
+ *                   Gerhard.Wichert@pdb.siemens.de
+ *
+ *
+ * Redesigned the x86 32-bit VM architecture to deal with
+ * up to 16 Terrabyte physical memory. With current x86 CPUs
+ * we now support up to 64 Gigabytes physical RAM.
+ *
+ * Copyright (C) 1999 Ingo Molnar <mingo@redhat.com>
+ *
+ * Reworked for PowerPC by various contributors. Moved from
+ * highmem.h by Benjamin Herrenschmidt (c) 2009 IBM Corp.
+ */
+
+#include <linux/highmem.h>
+#include <linux/module.h>
+
+/*
+ * The use of kmap_atomic/kunmap_atomic is discouraged - kmap/kunmap
+ * gives a more generic (and caching) interface. But kmap_atomic can
+ * be used in IRQ contexts, so in some (very limited) cases we need
+ * it.
+ */
+void *kmap_atomic_prot(struct page *page, enum km_type type, pgprot_t prot)
+{
+       unsigned int idx;
+       unsigned long vaddr;
+
+       /* even !CONFIG_PREEMPT needs this, for in_atomic in do_page_fault */
+       pagefault_disable();
+       if (!PageHighMem(page))
+               return page_address(page);
+
+       debug_kmap_atomic(type);
+       idx = type + KM_TYPE_NR*smp_processor_id();
+       vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
+#ifdef CONFIG_DEBUG_HIGHMEM
+       BUG_ON(!pte_none(*(kmap_pte-idx)));
+#endif
+       __set_pte_at(&init_mm, vaddr, kmap_pte-idx, mk_pte(page, prot), 1);
+       local_flush_tlb_page(NULL, vaddr);
+
+       return (void*) vaddr;
+}
+EXPORT_SYMBOL(kmap_atomic_prot);
+
+void kunmap_atomic(void *kvaddr, enum km_type type)
+{
+#ifdef CONFIG_DEBUG_HIGHMEM
+       unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK;
+       enum fixed_addresses idx = type + KM_TYPE_NR*smp_processor_id();
+
+       if (vaddr < __fix_to_virt(FIX_KMAP_END)) {
+               pagefault_enable();
+               return;
+       }
+
+       BUG_ON(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx));
+
+       /*
+        * force other mappings to Oops if they'll try to access
+        * this pte without first remap it
+        */
+       pte_clear(&init_mm, vaddr, kmap_pte-idx);
+       local_flush_tlb_page(NULL, vaddr);
+#endif
+       pagefault_enable();
+}
+EXPORT_SYMBOL(kunmap_atomic);