[PATCH] EDAC: core EDAC support code

This is a subset of the bluesmoke project core code, stripped of the NMI work
which isn't ready to merge and some of the "interesting" proc functionality
that needs reworking or just has no place in kernel.  It requires no core
kernel changes except the added scrub functions already posted.

The goal is to merge further functionality only after the core code is
accepted and proven in the base kernel, and only at the point the upstream
extras are really ready to merge.

From: doug thompson <norsk5@xmission.com>

  This converts EDAC to sysfs and is the final chunk neccessary before EDAC
  has a stable user space API and can be considered for submission into the
  base kernel.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: doug thompson <norsk5@xmission.com>
Signed-off-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 18 insertions, 0 deletions

diff --git a/include/asm-x86_64/edac.h b/include/asm-x86_64/edac.h
new file mode 100644
index 000000000000..cad1cd42b4ee
--- /dev/null
+++ b/include/asm-x86_64/edac.h
@@ -0,0 +1,18 @@
+#ifndef ASM_EDAC_H
+#define ASM_EDAC_H
+
+/* ECC atomic, DMA, SMP and interrupt safe scrub function */
+
+static __inline__ void atomic_scrub(void *va, u32 size)
+{
+        unsigned int *virt_addr = va;
+        u32 i;
+
+        for (i = 0; i < size / 4; i++, virt_addr++)
+                /* Very carefully read and write to memory atomically
+                 * so we are interrupt, DMA and SMP safe.
+                 */
+                __asm__ __volatile__("lock; addl $0, %0"::"m"(*virt_addr));
+}
+
+#endif