maint: Fix macros with broken 'do/while(0); ' usage

The point of writing a macro embedded in a 'do { ... } while (0)'
loop (particularly if the macro has multiple statements or would
otherwise end with an 'if' statement) is so that the macro can be
used as a drop-in statement with the caller supplying the
trailing ';'.  Although our coding style frowns on brace-less 'if':
  if (cond)
    statement;
  else
    something else;
that is the classic case where failure to use do/while(0) wrapping
would cause the 'else' to pair with any embedded 'if' in the macro
rather than the intended outer 'if'.  But conversely, if the macro
includes an embedded ';', then the same brace-less coding style
would now have two statements, making the 'else' a syntax error
rather than pairing with the outer 'if'.  Thus, even though our
coding style with required braces is not impacted, ending a macro
with ';' makes our code harder to port to projects that use
brace-less styles.

The change should have no semantic impact.  I was not able to
fully compile-test all of the changes (as some of them are
examples of the ugly bit-rotting debug print statements that are
completely elided by default, and I didn't want to recompile
with the necessary -D witnesses - cleaning those up is left as a
bite-sized task for another day); I did, however, audit that for
all files touched, all callers of the changed macros DID supply
a trailing ';' at the callsite, and did not appear to be used
as part of a brace-less conditional.

Found mechanically via: $ git grep -B1 'while (0);' | grep -A1 \\\\

Signed-off-by: Eric Blake <eblake@redhat.com>
Acked-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20171201232433.25193-7-eblake@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/tests/acpi-utils.h b/tests/acpi-utils.h
index d5ca5b6238..ac52abd0dd 100644
--- a/tests/acpi-utils.h
+++ b/tests/acpi-utils.h
@@ -32,7 +32,7 @@ typedef struct {
     do {                                        \
         memread(addr, &field, sizeof(field));   \
         addr += sizeof(field);                  \
-    } while (0);
+    } while (0)
 
 #define ACPI_READ_ARRAY_PTR(arr, length, addr)  \
     do {                                        \
@@ -40,7 +40,7 @@ typedef struct {
         for (idx = 0; idx < length; ++idx) {    \
             ACPI_READ_FIELD(arr[idx], addr);    \
         }                                       \
-    } while (0);
+    } while (0)
 
 #define ACPI_READ_ARRAY(arr, addr)                               \
     ACPI_READ_ARRAY_PTR(arr, sizeof(arr) / sizeof(arr[0]), addr)
@@ -56,7 +56,7 @@ typedef struct {
         ACPI_READ_FIELD((table)->oem_revision, addr);            \
         ACPI_READ_ARRAY((table)->asl_compiler_id, addr);         \
         ACPI_READ_FIELD((table)->asl_compiler_revision, addr);   \
-    } while (0);
+    } while (0)
 
 #define ACPI_ASSERT_CMP(actual, expected) do { \
     char ACPI_ASSERT_CMP_str[5] = {}; \
@@ -77,7 +77,7 @@ typedef struct {
         ACPI_READ_FIELD((field).bit_offset, addr);   \
         ACPI_READ_FIELD((field).access_width, addr); \
         ACPI_READ_FIELD((field).address, addr);      \
-    } while (0);
+    } while (0)
 
 
 uint8_t acpi_calc_checksum(const uint8_t *data, int len);