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Re: [Qemu-trivial] [Qemu-devel] [PATCH] tpm_tis: fix format for 64bit va


From: Stefan Berger
Subject: Re: [Qemu-trivial] [Qemu-devel] [PATCH] tpm_tis: fix format for 64bit variable
Date: Tue, 31 Mar 2015 11:35:36 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0

On 03/31/2015 10:15 AM, Eric Blake wrote:
On 03/31/2015 08:09 AM, Eric Blake wrote:
On 03/31/2015 07:27 AM, Stefan Berger wrote:
Signed-off-by: Stefan Berger <address@hidden>
---
  hw/tpm/tpm_tis.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/tpm/tpm_tis.c b/hw/tpm/tpm_tis.c
index 815c8ea..52e0148 100644
--- a/hw/tpm/tpm_tis.c
+++ b/hw/tpm/tpm_tis.c
@@ -814,7 +814,7 @@ static void tpm_tis_mmio_write_intern(void *opaque, hwaddr 
addr,
              tis->loc[locty].state == TPM_TIS_STATE_COMPLETION) {
              /* drop the byte */
          } else {
-            DPRINTF("tpm_tis: Data to send to TPM: %08x (size=%d)\n",
+            DPRINTF("tpm_tis: Data to send to TPM: %08lx (size=%d)\n",
NACK.  When printing uint64_t val, you HAVE to use PRIx64, not lx, for
the sake of 32-bit platforms.
Furthermore, you could have caught this much sooner if you fix the
definition of DPRINTF.  This file used:

#ifdef DEBUG_TIS
#define DPRINTF(fmt, ...) \
     do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
#else
#define DPRINTF(fmt, ...) \
     do { } while (0)
#endif

which is bad, because the compiler CAN'T see the type mismatch unless
you turn debugging on (alas, we have a LOT of files in the code base
with similar bad patterns).  A better example is hw/display/cg3.c:

/* Change to 1 to enable debugging */
#define DEBUG_CG3 0
...
#define DPRINTF(fmt, ...) do { \
     if (DEBUG_CG3) { \
         printf("CG3: " fmt , ## __VA_ARGS__); \
     } \
} while (0);

I'll move it towards that after 2.3 is out.

     Stefan




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