OvmfPkg/AcpiPlatformDxe: fix spurious uninitialized var warning

[edk2] [PATCH] OvmfPkg/AcpiPlatformDxe: fix spurious uninitialized var warning

Posted by Ard Biesheuvel 6 years, 10 months ago

Commit 4275f38507a4 ("OvmfPkg/AcpiPlatformDxe: alloc blobs from 64-bit
space unless restricted") introduced a variable which is [incorrectly]
identified by GCC as being potentially uninitialized. So let's just set
it to NULL before use.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 OvmfPkg/AcpiPlatformDxe/QemuFwCfgAcpi.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/OvmfPkg/AcpiPlatformDxe/QemuFwCfgAcpi.c b/OvmfPkg/AcpiPlatformDxe/QemuFwCfgAcpi.c
index 98be36c64b43..a0b1cfd2be05 100644
--- a/OvmfPkg/AcpiPlatformDxe/QemuFwCfgAcpi.c
+++ b/OvmfPkg/AcpiPlatformDxe/QemuFwCfgAcpi.c
@@ -1001,6 +1001,7 @@ InstallQemuFwCfgTables (
   RestorePciDecoding (OriginalPciAttributes, OriginalPciAttributesCount);
   LoaderEnd = LoaderStart + FwCfgSize / sizeof *LoaderEntry;
 
+  AllocationsRestrictedTo32Bit = NULL;
   Status = CollectAllocationsRestrictedTo32Bit (
              &AllocationsRestrictedTo32Bit,
              LoaderStart,
-- 
2.9.3

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Re: [edk2] [PATCH] OvmfPkg/AcpiPlatformDxe: fix spurious uninitialized var warning

Posted by Laszlo Ersek 6 years, 10 months ago

On 06/08/17 21:05, Ard Biesheuvel wrote:
> Commit 4275f38507a4 ("OvmfPkg/AcpiPlatformDxe: alloc blobs from 64-bit
> space unless restricted") introduced a variable which is [incorrectly]
> identified by GCC as being potentially uninitialized. So let's just set
> it to NULL before use.
> 
> Contributed-under: TianoCore Contribution Agreement 1.0
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> ---
>  OvmfPkg/AcpiPlatformDxe/QemuFwCfgAcpi.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/OvmfPkg/AcpiPlatformDxe/QemuFwCfgAcpi.c b/OvmfPkg/AcpiPlatformDxe/QemuFwCfgAcpi.c
> index 98be36c64b43..a0b1cfd2be05 100644
> --- a/OvmfPkg/AcpiPlatformDxe/QemuFwCfgAcpi.c
> +++ b/OvmfPkg/AcpiPlatformDxe/QemuFwCfgAcpi.c
> @@ -1001,6 +1001,7 @@ InstallQemuFwCfgTables (
>    RestorePciDecoding (OriginalPciAttributes, OriginalPciAttributesCount);
>    LoaderEnd = LoaderStart + FwCfgSize / sizeof *LoaderEntry;
>  
> +  AllocationsRestrictedTo32Bit = NULL;
>    Status = CollectAllocationsRestrictedTo32Bit (
>               &AllocationsRestrictedTo32Bit,
>               LoaderStart,
> 

Reviewed-by: Laszlo Ersek <lersek@redhat.com>

Thanks, Ard!
Laszlo
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Re: [edk2] [PATCH] OvmfPkg/AcpiPlatformDxe: fix spurious uninitialized var warning

Posted by Ard Biesheuvel 6 years, 10 months ago

On 8 June 2017 at 22:18, Laszlo Ersek <lersek@redhat.com> wrote:
> On 06/08/17 21:05, Ard Biesheuvel wrote:
>> Commit 4275f38507a4 ("OvmfPkg/AcpiPlatformDxe: alloc blobs from 64-bit
>> space unless restricted") introduced a variable which is [incorrectly]
>> identified by GCC as being potentially uninitialized. So let's just set
>> it to NULL before use.
>>
>> Contributed-under: TianoCore Contribution Agreement 1.0
>> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
>> ---
>>  OvmfPkg/AcpiPlatformDxe/QemuFwCfgAcpi.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/OvmfPkg/AcpiPlatformDxe/QemuFwCfgAcpi.c b/OvmfPkg/AcpiPlatformDxe/QemuFwCfgAcpi.c
>> index 98be36c64b43..a0b1cfd2be05 100644
>> --- a/OvmfPkg/AcpiPlatformDxe/QemuFwCfgAcpi.c
>> +++ b/OvmfPkg/AcpiPlatformDxe/QemuFwCfgAcpi.c
>> @@ -1001,6 +1001,7 @@ InstallQemuFwCfgTables (
>>    RestorePciDecoding (OriginalPciAttributes, OriginalPciAttributesCount);
>>    LoaderEnd = LoaderStart + FwCfgSize / sizeof *LoaderEntry;
>>
>> +  AllocationsRestrictedTo32Bit = NULL;
>>    Status = CollectAllocationsRestrictedTo32Bit (
>>               &AllocationsRestrictedTo32Bit,
>>               LoaderStart,
>>
>
> Reviewed-by: Laszlo Ersek <lersek@redhat.com>
>

Pushed as 8f98c76f992b
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