Re: [PATCH v10 20/22] x86: mm: Convert dump_pagetables to use walk_page_range
From: Andrew Morton <akpm@linux-foundation.org>
Date: 2019-08-07 20:17:01
Also in:
linux-mm, lkml
On Wed, 7 Aug 2019 13:58:21 +0100 Steven Price [off-list ref] wrote:
quoted
./arch/x86/include/asm/pgtable_64_types.h:56:22: error: initializer element is not constant #define PTRS_PER_PGD 512 ^This is very unhelpful of GCC - it's actually PTRS_PER_P4D which isn't constant!
Well. You had every right to assume that an all-caps macro is a
compile-time constant.
We are innocent victims of Kirill's c65e774fb3f6af2 ("x86/mm: Make
PGDIR_SHIFT and PTRS_PER_P4D variable") which lazily converted these
macros into runtime-only, under some Kconfig settings. It should have
changed those macros into static inlined lower-case functions.
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