Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752162AbbKAHrR (ORCPT ); Sun, 1 Nov 2015 02:47:17 -0500 Received: from mail-pa0-f47.google.com ([209.85.220.47]:35270 "EHLO mail-pa0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751226AbbKAHqo (ORCPT ); Sun, 1 Nov 2015 02:46:44 -0500 From: Jungseok Lee To: catalin.marinas@arm.com, will.deacon@arm.com, cl@linux.com, tj@kernel.org, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org Cc: james.morse@arm.com, takahiro.akashi@linaro.org, mark.rutland@arm.com, barami97@gmail.com, linux-kernel@vger.kernel.org Subject: [PATCH v6 2/3] percpu: add PERCPU_ATOM_SIZE for a generic percpu area setup Date: Sun, 1 Nov 2015 07:46:16 +0000 Message-Id: <1446363977-23656-3-git-send-email-jungseoklee85@gmail.com> X-Mailer: git-send-email 2.5.0 In-Reply-To: <1446363977-23656-1-git-send-email-jungseoklee85@gmail.com> References: <1446363977-23656-1-git-send-email-jungseoklee85@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2026 Lines: 59 There is no room to adjust 'atom_size' now when a generic percpu area is used. It would be redundant to write down an architecture-specific setup_per_cpu_areas() in order to only change the 'atom_size'. Thus, this patch adds a new definition, PERCPU_ATOM_SIZE, which is PAGE_SIZE by default. The value could be updated if needed by architecture. Signed-off-by: Jungseok Lee --- include/linux/percpu.h | 4 ++++ mm/percpu.c | 6 +++--- 2 files changed, 7 insertions(+), 3 deletions(-) diff --git a/include/linux/percpu.h b/include/linux/percpu.h index 4bc6daf..57a2f16 100644 --- a/include/linux/percpu.h +++ b/include/linux/percpu.h @@ -18,6 +18,10 @@ #define PERCPU_MODULE_RESERVE 0 #endif +#ifndef PERCPU_ATOM_SIZE +#define PERCPU_ATOM_SIZE PAGE_SIZE +#endif + /* minimum unit size, also is the maximum supported allocation size */ #define PCPU_MIN_UNIT_SIZE PFN_ALIGN(32 << 10) diff --git a/mm/percpu.c b/mm/percpu.c index a63b4d8..cd1e0ec 100644 --- a/mm/percpu.c +++ b/mm/percpu.c @@ -2201,8 +2201,8 @@ void __init setup_per_cpu_areas(void) * what the legacy allocator did. */ rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE, - PERCPU_DYNAMIC_RESERVE, PAGE_SIZE, NULL, - pcpu_dfl_fc_alloc, pcpu_dfl_fc_free); + PERCPU_DYNAMIC_RESERVE, PERCPU_ATOM_SIZE, + NULL, pcpu_dfl_fc_alloc, pcpu_dfl_fc_free); if (rc < 0) panic("Failed to initialize percpu areas."); @@ -2231,7 +2231,7 @@ void __init setup_per_cpu_areas(void) ai = pcpu_alloc_alloc_info(1, 1); fc = memblock_virt_alloc_from_nopanic(unit_size, - PAGE_SIZE, + PERCPU_ATOM_SIZE, __pa(MAX_DMA_ADDRESS)); if (!ai || !fc) panic("Failed to allocate memory for percpu areas."); -- 2.5.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/