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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2010-10-26 14:21:51 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-10-26 16:52:08 -0700
commit3e4d3af501cccdc8a8cca41bdbe57d54ad7e7e73 (patch)
tree2ce507f7ec7275563653e52f18606aba4f99b7f1 /arch/frv/mm
parent61ecdb801ef2cd28e32442383106d7837d76deac (diff)
downloadlinux-3e4d3af501cccdc8a8cca41bdbe57d54ad7e7e73.tar.gz
mm: stack based kmap_atomic()
Keep the current interface but ignore the KM_type and use a stack based approach. The advantage is that we get rid of crappy code like: #define __KM_PTE \ (in_nmi() ? KM_NMI_PTE : \ in_irq() ? KM_IRQ_PTE : \ KM_PTE0) and in general can stop worrying about what context we're in and what kmap slots might be appropriate for that. The downside is that FRV kmap_atomic() gets more expensive. For now we use a CPP trick suggested by Andrew: #define kmap_atomic(page, args...) __kmap_atomic(page) to avoid having to touch all kmap_atomic() users in a single patch. [ not compiled on: - mn10300: the arch doesn't actually build with highmem to begin with ] [akpm@linux-foundation.org: coding-style fixes] [akpm@linux-foundation.org: fix up drivers/gpu/drm/i915/intel_overlay.c] Acked-by: Rik van Riel <riel@redhat.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Chris Metcalf <cmetcalf@tilera.com> Cc: David Howells <dhowells@redhat.com> Cc: Hugh Dickins <hughd@google.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: David Miller <davem@davemloft.net> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Dave Airlie <airlied@linux.ie> Cc: Li Zefan <lizf@cn.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/frv/mm')
-rw-r--r--arch/frv/mm/cache-page.c8
-rw-r--r--arch/frv/mm/highmem.c50
2 files changed, 54 insertions, 4 deletions
diff --git a/arch/frv/mm/cache-page.c b/arch/frv/mm/cache-page.c
index 0261cbe153b..b24ade27a0f 100644
--- a/arch/frv/mm/cache-page.c
+++ b/arch/frv/mm/cache-page.c
@@ -26,11 +26,11 @@ void flush_dcache_page(struct page *page)
dampr2 = __get_DAMPR(2);
- vaddr = kmap_atomic(page, __KM_CACHE);
+ vaddr = kmap_atomic_primary(page, __KM_CACHE);
frv_dcache_writeback((unsigned long) vaddr, (unsigned long) vaddr + PAGE_SIZE);
- kunmap_atomic(vaddr, __KM_CACHE);
+ kunmap_atomic_primary(vaddr, __KM_CACHE);
if (dampr2) {
__set_DAMPR(2, dampr2);
@@ -54,12 +54,12 @@ void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
dampr2 = __get_DAMPR(2);
- vaddr = kmap_atomic(page, __KM_CACHE);
+ vaddr = kmap_atomic_primary(page, __KM_CACHE);
start = (start & ~PAGE_MASK) | (unsigned long) vaddr;
frv_cache_wback_inv(start, start + len);
- kunmap_atomic(vaddr, __KM_CACHE);
+ kunmap_atomic_primary(vaddr, __KM_CACHE);
if (dampr2) {
__set_DAMPR(2, dampr2);
diff --git a/arch/frv/mm/highmem.c b/arch/frv/mm/highmem.c
index eadd0765807..61088dcc159 100644
--- a/arch/frv/mm/highmem.c
+++ b/arch/frv/mm/highmem.c
@@ -36,3 +36,53 @@ struct page *kmap_atomic_to_page(void *ptr)
{
return virt_to_page(ptr);
}
+
+void *__kmap_atomic(struct page *page)
+{
+ unsigned long paddr;
+ int type;
+
+ pagefault_disable();
+ type = kmap_atomic_idx_push();
+ paddr = page_to_phys(page);
+
+ switch (type) {
+ /*
+ * The first 4 primary maps are reserved for architecture code
+ */
+ case 0: return __kmap_atomic_primary(4, paddr, 6);
+ case 1: return __kmap_atomic_primary(5, paddr, 7);
+ case 2: return __kmap_atomic_primary(6, paddr, 8);
+ case 3: return __kmap_atomic_primary(7, paddr, 9);
+ case 4: return __kmap_atomic_primary(8, paddr, 10);
+
+ case 5 ... 5 + NR_TLB_LINES - 1:
+ return __kmap_atomic_secondary(type - 5, paddr);
+
+ default:
+ BUG();
+ return NULL;
+ }
+}
+EXPORT_SYMBOL(__kmap_atomic);
+
+void __kunmap_atomic(void *kvaddr)
+{
+ int type = kmap_atomic_idx_pop();
+ switch (type) {
+ case 0: __kunmap_atomic_primary(4, 6); break;
+ case 1: __kunmap_atomic_primary(5, 7); break;
+ case 2: __kunmap_atomic_primary(6, 8); break;
+ case 3: __kunmap_atomic_primary(7, 9); break;
+ case 4: __kunmap_atomic_primary(8, 10); break;
+
+ case 5 ... 5 + NR_TLB_LINES - 1:
+ __kunmap_atomic_secondary(type - 5, kvaddr);
+ break;
+
+ default:
+ BUG();
+ }
+ pagefault_enable();
+}
+EXPORT_SYMBOL(__kunmap_atomic);