Re: [PATCH] x86/efi: Only map kernel text for EFI mixed mode

[Matt Fleming <matt-mF/unelCI9GS6iBeEJttW/XRex20P6io@public.gmane.org>]

On Fri, 29 Jan, at 05:10:33PM, Sai Praneeth Prakhya wrote:
> From: Sai Praneeth <sai.praneeth.prakhya-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
> 
> The correct symbol to use when figuring out the size of the kernel
> text is '_etext', not '_end' which is the symbol for the entire kernel
> image includes data and debug sections.
> 
> Cc: Borislav Petkov <bp-Gina5bIWoIWzQB+pC5nmwQ@public.gmane.org>
> Cc: Ricardo Neri <ricardo.neri-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
> Cc: Ravi Shankar <ravi.v.shankar-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
> Signed-off-by: Matt Fleming <matt-mF/unelCI9GS6iBeEJttW/XRex20P6io@public.gmane.org>
> Signed-off-by: Sai Praneeth Prakhya <sai.praneeth.prakhya-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
> ---
>  arch/x86/platform/efi/efi_64.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/platform/efi/efi_64.c b/arch/x86/platform/efi/efi_64.c
> index b492521503fe..040fff163d96 100644
> --- a/arch/x86/platform/efi/efi_64.c
> +++ b/arch/x86/platform/efi/efi_64.c
> @@ -275,7 +275,7 @@ int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages)
>  	efi_scratch.phys_stack = virt_to_phys(page_address(page));
>  	efi_scratch.phys_stack += PAGE_SIZE; /* stack grows down */
>  
> -	npages = (_end - _text) >> PAGE_SHIFT;
> +	npages = (_etext - _text) >> PAGE_SHIFT;
>  	text = __pa(_text);
>  	pfn = text >> PAGE_SHIFT;
>  

Thanks, applied.