Re: [PATCH v17 0/3] Improve proc RSS accuracy
From: Mathieu Desnoyers
Date: Fri Feb 27 2026 - 08:40:56 EST
On 2026-02-26 20:12, Nathan Chancellor wrote:
FWIW, the ClangBuiltLinux CI sees a boot failure with sparc64_defconfig,
which does not appear to be clang specific. I can reproduce it here
with:
I found the issue with the info provided by Heiko. Thanks for the
reproducer!
This series is not bisectable to see which specific patch causes this,
as I get
In file included from mm/init-mm.c:2:
include/linux/mm_types.h:1419:57: error: 'PERCPU_COUNTER_TREE_ITEMS_STATIC_SIZE' undeclared here (not in a function)
1419 | [0 ... sizeof(cpumask_t) + MM_CID_STATIC_SIZE + PERCPU_COUNTER_TREE_ITEMS_STATIC_SIZE. - 1] = 0 \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mm/init-mm.c:50:27: note: in expansion of macro 'MM_STRUCT_FLEXIBLE_ARRAY_INIT'
50 | .flexible_array = MM_STRUCT_FLEXIBLE_ARRAY_INIT,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/mm_types.h:1419:10: error: array index in initializer not of integer type
1419 | [0 ... sizeof(cpumask_t) + MM_CID_STATIC_SIZE + PERCPU_COUNTER_TREE_ITEMS_STATIC_SIZE - 1] = 0 \
| ^
mm/init-mm.c:50:27: note: in expansion of macro 'MM_STRUCT_FLEXIBLE_ARRAY_INIT'
50 | .flexible_array = MM_STRUCT_FLEXIBLE_ARRAY_INIT,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/mm_types.h:1419:10: note: (near initialization for 'init_mm.flexible_array')
1419 | [0 ... sizeof(cpumask_t) + MM_CID_STATIC_SIZE + PERCPU_COUNTER_TREE_ITEMS_STATIC_SIZE - 1] = 0 \
| ^
mm/init-mm.c:50:27: note: in expansion of macro 'MM_STRUCT_FLEXIBLE_ARRAY_INIT'
50 | .flexible_array = MM_STRUCT_FLEXIBLE_ARRAY_INIT,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prior to this change that removes PERCPU_COUNTER_TREE_ITEMS_STATIC_SIZE.
Good catch. I will fix this as well for v18.
Thanks!
Mathieu
--
Mathieu Desnoyers
EfficiOS Inc.
https://www.efficios.com