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SubjectRe: [PATCH] kmemleak: Ignore the aperture memory hole on x86_64

* Catalin Marinas <catalin.marinas@arm.com> wrote:

> This block is allocated with alloc_bootmem() and scanned by kmemleak but
> the kernel direct mapping may no longer exist. This patch tells kmemleak
> to ignore this memory hole.
>
> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Ingo Molnar <mingo@elte.hu>
> ---
> arch/x86/kernel/aperture_64.c | 5 +++++
> 1 files changed, 5 insertions(+), 0 deletions(-)
>
> diff --git a/arch/x86/kernel/aperture_64.c b/arch/x86/kernel/aperture_64.c
> index 676debf..cb690b3 100644
> --- a/arch/x86/kernel/aperture_64.c
> +++ b/arch/x86/kernel/aperture_64.c
> @@ -94,6 +94,11 @@ static u32 __init allocate_aperture(void)
> * code for safe
> */
> p = __alloc_bootmem_nopanic(aper_size, aper_size, 512ULL<<20);
> + /*
> + * Kmemleak should not scan this block as it may not be mapped via the
> + * kernel direct mapping.
> + */
> + kmemleak_ignore(p);

i tried this in -tip, it causes this build error:

arch/x86/kernel/aperture_64.c: In function ‘allocate_aperture’:
arch/x86/kernel/aperture_64.c:101: error: implicit declaration of function ‘kmemleak_ignore’

Ingo
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