[typo in subject "rebudant"]
On Tue, Mar 09, 2021 at 06:21:38PM +0800, Pingfan Liu wrote:
> There are two identical implementations of setup_per_cpu_areas() in
> mm/percpu.c and drivers/base/arch_numa.c.
>
> Hence removing the one in arch_numa.c. And let arm64 drop
> HAVE_SETUP_PER_CPU_AREA.
>
> Signed-off-by: Pingfan Liu <kernelf...@gmail.com>
> Cc: Catalin Marinas <catalin.mari...@arm.com>
> Cc: Will Deacon <w...@kernel.org>
> Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
> Cc: "Rafael J. Wysocki" <raf...@kernel.org>
> Cc: Atish Patra <atish.pa...@wdc.com>
> Cc: linux-kernel@vger.kernel.org
> To: linux-arm-ker...@lists.infradead.org
> ---
> arch/arm64/Kconfig | 4 ----
> drivers/base/arch_numa.c | 22 ----------------------
> 2 files changed, 26 deletions(-)
>
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 1f212b47a48a..d4bf8be0c3d5 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -1022,10 +1022,6 @@ config USE_PERCPU_NUMA_NODE_ID
> def_bool y
> depends on NUMA
>
> -config HAVE_SETUP_PER_CPU_AREA
> - def_bool y
> - depends on NUMA
> -
> config NEED_PER_CPU_EMBED_FIRST_CHUNK
> def_bool y
> depends on NUMA
> diff --git a/drivers/base/arch_numa.c b/drivers/base/arch_numa.c
> index 4cc4e117727d..23e1e419a83d 100644
> --- a/drivers/base/arch_numa.c
> +++ b/drivers/base/arch_numa.c
> @@ -167,28 +167,6 @@ static void __init pcpu_fc_free(void *ptr, size_t size)
> {
> memblock_free_early(__pa(ptr), size);
> }
> -
> -void __init setup_per_cpu_areas(void)
> -{
> - unsigned long delta;
> - unsigned int cpu;
> - int rc;
> -
> - /*
> - * Always reserve area for module percpu variables. That's
> - * what the legacy allocator did.
> - */
> - rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,
> - PERCPU_DYNAMIC_RESERVE, PAGE_SIZE,
> - pcpu_cpu_distance,
> - pcpu_fc_alloc, pcpu_fc_free);
This doesn't look identical to the version in mm/percpu.c -- that one passes
NULL instead of 'pcpu_cpu_distance' and tries to allocate the pcpu memory on
the relevant NUMA nodes. In fact, if you could remove this function, you
could probably remove the whole HAVE_SETUP_PER_CPU_AREA block here as the
other functions are just used as helpers. So I'm not sure this is valid.
Will
