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Re: [Qemu-devel] [PATCH] tests/bios-tables-test: Compiler warning fix
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [Qemu-devel] [PATCH] tests/bios-tables-test: Compiler warning fix |
Date: |
Thu, 20 Jul 2017 17:55:48 +0100 |
User-agent: |
Mutt/1.8.3 (2017-05-23) |
* Daniel P. Berrange (address@hidden) wrote:
> On Thu, Jul 20, 2017 at 05:35:36PM +0100, Dr. David Alan Gilbert (git) wrote:
> > From: "Dr. David Alan Gilbert" <address@hidden>
> >
> > gcc 7.1.1 in fedora 26 moans about the:
> > tables = g_new0(uint32_t, tables_nr)
> >
> > because it can't convince itself that tables_nr is positive.
> > This is fallout from g_assert_cmpint no longer necessarily being
> > no-return; replace it with a plain g_assert.
> >
> > Signed-off-by: Dr. David Alan Gilbert <address@hidden>
> > ---
> > tests/bios-tables-test.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/tests/bios-tables-test.c b/tests/bios-tables-test.c
> > index 63da978f0b..564da45f65 100644
> > --- a/tests/bios-tables-test.c
> > +++ b/tests/bios-tables-test.c
> > @@ -108,7 +108,7 @@ static void test_acpi_rsdt_table(test_data *data)
> > /* compute the table entries in rsdt */
> > tables_nr = (rsdt_table->length - sizeof(AcpiRsdtDescriptorRev1)) /
> > sizeof(uint32_t);
> > - g_assert_cmpint(tables_nr, >, 0);
> > + g_assert(tables_nr > 0);
>
> IMHO your original patch was better - rsdt_table->length is an
> uint32_t, and sizeof() evaluates to size_t, but we're assigning
> to a local tables_nr that is a signed int. So tables_nr would
> be better declared as size_t. That would mean the assert can
> just be removed entirely, or replaced by an assert that
> rsdt_table->length > sizeof(AcpiRsdtDescriptorRev1) if we're
> concerned about that
Given that assert was there I'd assumed Marcel was explicitly checking
for that case, so my original hack of just making it a uint or size_t
didn't seem safe.
Checking that rsdt_table->length > sizeof(AcpiRsdtDescriptorRev1)
probably is safer; although this is only a sanity assert in a test
case, not dealing with user data, so I just made the minimal change.
Dave
>
> Regards,
> Daniel
> --
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--
Dr. David Alan Gilbert / address@hidden / Manchester, UK