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Re: [Xen-devel] [PATCH V11 3/8] Introduce XenHostPCIDevice to access a pci device on the host.

On 16/05/12 12:24, Konrad Rzeszutek Wilk wrote:
On Tue, Apr 03, 2012 at 04:32:38PM +0100, Anthony PERARD wrote:
Signed-off-by: Anthony PERARD<anthony.perard@xxxxxxxxxx>

Looks good, thought I've just couple of tiny comments:


You might want a comment explaining why 512, and not
a more precise number like 741.

Actually, I only need the first 7 line of the resources file. So this is 399 bytes. I just add a little bit more.

.. snip..
+    do {
+        rc = read(fd,&buf, sizeof (buf) - 1);
+        if (rc<  0&&  errno != EINTR) {
+            rc = -errno;
+            goto out;
+        }
+    } while (rc<  0);

Ok, you read it in. Maybe my 'wc' magic is gone, but this
is what I get:
[root@localhost 0000:00:02.0]# cat resource | wc -c
.. snip..

The answer to the life? Can you provide a comment explaining
the reason why it is 42, please?

I just define more than needed, and 42 is a good number :-).
But the maximum I need is probably 7 (for example '0x8086\n', for a vendor id). Or 20, number of digit in LONG_MAX, base 10.

+static int xen_host_pci_get_value(XenHostPCIDevice *d, const char *name,
+                                  unsigned int *pvalue, int base)

Anthony PERARD

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