Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755055AbaFRUPa (ORCPT ); Wed, 18 Jun 2014 16:15:30 -0400 Received: from mail-yh0-f73.google.com ([209.85.213.73]:46354 "EHLO mail-yh0-f73.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754614AbaFRUP3 (ORCPT ); Wed, 18 Jun 2014 16:15:29 -0400 From: Colin Cross To: linux-arm-kernel@lists.infradead.org Cc: Catalin Marinas , Will Deacon , linux-kernel@vger.kernel.org, Andrew Morton , Colin Cross , stable@vger.kernel.org Subject: [PATCH] ARM64: implement TASK_SIZE_OF Date: Wed, 18 Jun 2014 13:10:09 -0700 Message-Id: <1403122209-26352-1-git-send-email-ccross@android.com> X-Mailer: git-send-email 2.0.0.526.g5318336 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org include/linux/sched.h implements TASK_SIZE_OF as TASK_SIZE if it is not set by the architecture headers. TASK_SIZE uses the current task to determine the size of the virtual address space. On a 64-bit kernel this will cause reading /proc/pid/pagemap of a 64-bit process from a 32-bit process to return EOF when it reads past 0xffffffff. Implement TASK_SIZE_OF exactly the same as TASK_SIZE with test_tsk_thread_flag instead of test_thread_flag. Cc: stable@vger.kernel.org Signed-off-by: Colin Cross --- arch/arm64/include/asm/memory.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h index 993bce527b85..902eb708804a 100644 --- a/arch/arm64/include/asm/memory.h +++ b/arch/arm64/include/asm/memory.h @@ -56,6 +56,8 @@ #define TASK_SIZE_32 UL(0x100000000) #define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \ TASK_SIZE_32 : TASK_SIZE_64) +#define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \ + TASK_SIZE_32 : TASK_SIZE_64) #else #define TASK_SIZE TASK_SIZE_64 #endif /* CONFIG_COMPAT */ -- 2.0.0.526.g5318336 -- 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/