On Tue, Feb 13, 2024 at 01:41:48PM +0100, Ard Biesheuvel wrote:
> From: Ard Biesheuvel <ardb@xxxxxxxxxx>
>
> Assigning the 5-level paging related global variables from the earliest
> C code using explicit references that use the 1:1 translation of memory
> is unnecessary, as the startup code itself does not rely on them to
> create the initial page tables, and this is all it should be doing. So
> defer these assignments to the primary C entry code that executes via
> the ordinary kernel virtual mapping.
>
> Signed-off-by: Ard Biesheuvel <ardb@xxxxxxxxxx>
> ---
> arch/x86/kernel/head64.c | 44 +++++++-------------
> 1 file changed, 14 insertions(+), 30 deletions(-)
Whoops:
arch/x86/kernel/head64.c: In function ‘x86_64_start_kernel’:
arch/x86/kernel/head64.c:442:17: error: ‘__pgtable_l5_enabled’ undeclared (first use in this function); did you mean ‘pgtable_l5_enabled’?
442 | __pgtable_l5_enabled = 1;
| ^~~~~~~~~~~~~~~~~~~~
| pgtable_l5_enabled
arch/x86/kernel/head64.c:442:17: note: each undeclared identifier is reported only once for each function it appears in
make[4]: *** [scripts/Makefile.build:243: arch/x86/kernel/head64.o] Error 1
make[3]: *** [scripts/Makefile.build:481: arch/x86/kernel] Error 2
make[2]: *** [scripts/Makefile.build:481: arch/x86] Error 2
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [/mnt/kernel/kernel/2nd/linux/Makefile:1921: .] Error 2
make: *** [Makefile:240: __sub-make] Error 2
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
