> [ Goes around and rummages ]
>
> Oh, never mind, looking around reminded me why: we want to map the
> kernel text in the top 31 bits, so that we can use the faster
> -mcmodel=kernel because all symbols fit in sign-extended 32 bits.
>
> Maybe there was some other reason too, but I think that's i
On Sat, 4 Aug 2018, Linus Torvalds wrote:
> On Fri, Aug 3, 2018 at 5:19 PM Hugh Dickins wrote:
> >
> > I thought that virt_to_page() only works on virtual addresses
> > in the direct map
>
> You're right that virt_to_page() does not work on any _actual_ virtual
> mappings (ie no user pages, and n
On Fri, Aug 3, 2018 at 5:19 PM Hugh Dickins wrote:
>
> I thought that virt_to_page() only works on virtual addresses
> in the direct map
You're right that virt_to_page() does not work on any _actual_ virtual
mappings (ie no user pages, and no vmalloc() pages etc). It does not
follow page tables a
On Thu, 2 Aug 2018, Dave Hansen wrote:
>
> From: Dave Hansen
>
> The x86 code has several places where it frees parts of kernel image:
>
> 1. Unused SMP alternative
> 2. __init code
> 3. The hole between text and rodata
> 4. The hole between rodata and data
>
> We call free_init_pages() to
From: Dave Hansen
The x86 code has several places where it frees parts of kernel image:
1. Unused SMP alternative
2. __init code
3. The hole between text and rodata
4. The hole between rodata and data
We call free_init_pages() to do this. Strangely, we convert the
symbol addresses to ker
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