[v7] mm: Eliminate fake head pages from vmemmap optimization

[PATCHv7 11/18] x86/vdso: Undefine CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP for vdso32

Posted by Kiryl Shutsemau (Meta) 1 month ago

The 32-bit VDSO build on x86_64 uses fake_32bit_build.h to undefine
various kernel configuration options that are not suitable for the
VDSO context or may cause build issues when including kernel headers.

Undefine CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP in fake_32bit_build.h to
prepare for change in  HugeTLB Vmemmap Optimization.

Signed-off-by: Kiryl Shutsemau (Meta) <kas@kernel.org>
---
 arch/x86/entry/vdso/vdso32/fake_32bit_build.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/entry/vdso/vdso32/fake_32bit_build.h b/arch/x86/entry/vdso/vdso32/fake_32bit_build.h
index db1b15f686e3..bc3e549795c3 100644
--- a/arch/x86/entry/vdso/vdso32/fake_32bit_build.h
+++ b/arch/x86/entry/vdso/vdso32/fake_32bit_build.h
@@ -11,6 +11,7 @@
 #undef CONFIG_PGTABLE_LEVELS
 #undef CONFIG_ILLEGAL_POINTER_VALUE
 #undef CONFIG_SPARSEMEM_VMEMMAP
+#undef CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP
 #undef CONFIG_NR_CPUS
 #undef CONFIG_PARAVIRT_XXL
 
-- 
2.51.2

Re: [PATCHv7 11/18] x86/vdso: Undefine CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP for vdso32

Posted by David Hildenbrand (Arm) 2 weeks, 2 days ago

On 2/27/26 20:42, Kiryl Shutsemau (Meta) wrote:
> The 32-bit VDSO build on x86_64 uses fake_32bit_build.h to undefine
> various kernel configuration options that are not suitable for the
> VDSO context or may cause build issues when including kernel headers.
> 
> Undefine CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP in fake_32bit_build.h to
> prepare for change in  HugeTLB Vmemmap Optimization.
> 
> Signed-off-by: Kiryl Shutsemau (Meta) <kas@kernel.org>
> ---
>  arch/x86/entry/vdso/vdso32/fake_32bit_build.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/x86/entry/vdso/vdso32/fake_32bit_build.h b/arch/x86/entry/vdso/vdso32/fake_32bit_build.h
> index db1b15f686e3..bc3e549795c3 100644
> --- a/arch/x86/entry/vdso/vdso32/fake_32bit_build.h
> +++ b/arch/x86/entry/vdso/vdso32/fake_32bit_build.h
> @@ -11,6 +11,7 @@
>  #undef CONFIG_PGTABLE_LEVELS
>  #undef CONFIG_ILLEGAL_POINTER_VALUE
>  #undef CONFIG_SPARSEMEM_VMEMMAP
> +#undef CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP
>  #undef CONFIG_NR_CPUS
>  #undef CONFIG_PARAVIRT_XXL
>  

Pain as always :)

Acked-by: David Hildenbrand (Arm) <david@kernel.org>

-- 
Cheers,

David