[edk2-devel] [PATCH 1/1] MdeModulePkg/DxeIplPeim: Initialize pointer PageMapLevel5Entry
Liming Gao
liming.gao at intel.com
Thu Aug 15 00:25:31 UTC 2019
Shenglei:
The change is good. I agree to add comments for this change purpose like BZ https://bugzilla.tianocore.org/show_bug.cgi?id=607
With this change, Reviewed-by: Liming Gao <liming.gao at intel.com>.
Thanks
Liming
> -----Original Message-----
> From: devel at edk2.groups.io [mailto:devel at edk2.groups.io] On Behalf Of Laszlo Ersek
> Sent: Thursday, August 15, 2019 1:12 AM
> To: devel at edk2.groups.io; Zhang, Shenglei <shenglei.zhang at intel.com>
> Cc: Bi, Dandan <dandan.bi at intel.com>; Gao, Liming <liming.gao at intel.com>; Wu, Hao A <hao.a.wu at intel.com>
> Subject: Re: [edk2-devel] [PATCH 1/1] MdeModulePkg/DxeIplPeim: Initialize pointer PageMapLevel5Entry
>
> On 08/14/19 09:37, Zhang, Shenglei wrote:
> > Initialize PageMapLevel5Entry at the beginning of the function.
> >
> > This commit will fix a GCC 4.8.5 build failure introduced by commit
> > b3527dedc3951f061c5a73cb4fb2b0f95f47e08b.
> >
> > OvmfPkg build failure wtih gcc 4.8.5 still exists at latest edk2 version.
> > The commit 46f8a6891606746ca8b1e684ac379ce271306dc0 seems not to fix
> > the build failure completely.
> >
> > Cc: Dandan Bi <dandan.bi at intel.com>
> > Cc: Liming Gao <liming.gao at intel.com>
> > Cc: Hao A Wu <hao.a.wu at intel.com>
> > Signed-off-by: Shenglei Zhang <shenglei.zhang at intel.com>
> > ---
> > MdeModulePkg/Core/DxeIplPeim/X64/VirtualMemory.c | 2 ++
> > 1 file changed, 2 insertions(+)
> >
> > diff --git a/MdeModulePkg/Core/DxeIplPeim/X64/VirtualMemory.c b/MdeModulePkg/Core/DxeIplPeim/X64/VirtualMemory.c
> > index 2389f3eb485b..aae80536ac3d 100644
> > --- a/MdeModulePkg/Core/DxeIplPeim/X64/VirtualMemory.c
> > +++ b/MdeModulePkg/Core/DxeIplPeim/X64/VirtualMemory.c
> > @@ -652,6 +652,8 @@ CreateIdentityMappingPageTables (
> > UINT64 AddressEncMask;
> > IA32_CR4 Cr4;
> >
> > + PageMapLevel5Entry = NULL;
> > +
> > //
> > // Make sure AddressEncMask is contained to smallest supported address field
> > //
> >
>
> If you are convinced that we need this assignment *only* for suppressing
> an invalid compiler warning, then please add a comment about it:
>
> //
> // set PageMapLevel5Entry to suppress incorrect compiler/analyzer
> // warnings
> //
>
> Related documentation BZ:
>
> https://bugzilla.tianocore.org/show_bug.cgi?id=607
>
> ... Just a suggestion from my side; I defer to the MdeModulePkg maintainers.
>
> Thanks
> Laszlo
>
>
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