From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754898AbcCSQyc (ORCPT ); Sat, 19 Mar 2016 12:54:32 -0400 Received: from mout.gmx.net ([212.227.15.19]:56800 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754586AbcCSQy2 (ORCPT ); Sat, 19 Mar 2016 12:54:28 -0400 Date: Sat, 19 Mar 2016 17:54:10 +0100 From: Helge Deller To: linux-parisc@vger.kernel.org, James Bottomley , John David Anglin , James Hogan , linux-metag@vger.kernel.org, linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] parisc,metag: Implement CONFIG_DEBUG_STACK_USAGE option Message-ID: <20160319165410.GA31630@p100.box> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.23 (2014-03-12) X-Provags-ID: V03:K0:6yeWGBkgseRHF6d0vgGQ9166y9Nw5W6a8ftBXdBNKgCuSgjN9wz ku3VpbPMPDHsEajB8LuYpZZ54rZNwaPScfQTp66Lbt2C6mE+WVXOZEFRFd1nXfm/Vpm2TL2 SW75hIP1R5trxz2yeQhfZMLx3ntyRF3UWfgwJp/ZKmm3rp0sT69loWu124dbp22gZlCwCxJ 9HlAC4FG8O5Ij2kP9v9jA== X-UI-Out-Filterresults: notjunk:1;V01:K0:3L4Fn1X9G8I=:l/t3Nxq0oXQM6K6DWNajAA Tl7rPC7jA5MRI3B991J+DbQRacJ3VoZRlM/YuVQ3b18u/9n0d49Di81EwD8Jc7acy040oA5zy E5vgMOUoBT61bsqCsqg1VWazzX/8qnCfgxakaQJALe3Yt+MdgGB26bGTIiNF5vJhKazpim8Mg DWryL7IkvA6VhHraCApQbU7DJKLGhQc6xbbmt8BOUaM/KIToEQhwjIZjuKBOHyygC4bJMeGnw ibZW2zN+TCPobrfXOc7XGHakTaveOp+yoDB0HdmXpPlD3AAHgcAY4U6VxombrwO2+PcVzlRwP WgSrJOJLUpVYSSopjU+ieQDzVmi8WGEMm5K3irlrs1qf7lw3DXBt6VOEEIMqtnj+vqIEgCglB KgVRVir/hMcbrFIKMwDenvztr/i8FE58/0zXJ+t293XzYabzWrbrFeW+k1bQmSC3O6TZIpqka zTDAwEl5hoD1yLkDhGERgm+bLXk9PcvN2w9IdoiOAGe+T3lHTL/8xK0Z7PeGgbEDBBAx1JVri PKVgPA+GbEeJ11avYZQoSu5zNrWTgEEGiAZ+OfGplXjzhE9GxWdGH/l3my4SDaW7oBkeng9mJ Cw+XGv1vC0OootFOC4HqmMJCd5kHALH+EjWvNtQobtUviuDI0tfqq+2P0NIIhsfEbp1abiLB0 XV7UQR5iQVsJWE67pDz6r3604JXSu20eP4ctc+gxsmMYO/MM52N8CmHsTCKFcMxMPFev8ekJj WiABetQnZ5iTm/H1mNpH6jGUOzD8MS0pSmBPl91H9iXOBcx8inG7el+e/VE= Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On parisc and metag the stack grows upwards, so for those we need to scan the stack downwards in order to calculate how much stack a process has used. Tested on a 64bit parisc kernel. Signed-off-by: Helge Deller diff --git a/include/linux/sched.h b/include/linux/sched.h index 084ed9f..71591f3 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -2859,10 +2859,18 @@ static inline unsigned long stack_not_used(struct task_struct *p) unsigned long *n = end_of_stack(p); do { /* Skip over canary */ +# ifdef CONFIG_STACK_GROWSUP + n--; +# else n++; +# endif } while (!*n); +# ifdef CONFIG_STACK_GROWSUP + return (unsigned long)end_of_stack(p) - (unsigned long)n; +# else return (unsigned long)n - (unsigned long)end_of_stack(p); +# endif } #endif extern void set_task_stack_end_magic(struct task_struct *tsk); diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index f28f7fa..901f96c 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -546,7 +546,7 @@ config DEBUG_KMEMLEAK_DEFAULT_OFF config DEBUG_STACK_USAGE bool "Stack utilization instrumentation" - depends on DEBUG_KERNEL && !IA64 && !PARISC && !METAG + depends on DEBUG_KERNEL && !IA64 help Enables the display of the minimum amount of free stack which each task has ever had available in the sysrq-T and sysrq-P debug output.