From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e23smtp07.au.ibm.com (e23smtp07.au.ibm.com [202.81.31.140]) (using TLSv1 with cipher CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 48B061A001D for ; Fri, 22 Jan 2016 03:16:38 +1100 (AEDT) Received: from localhost by e23smtp07.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Fri, 22 Jan 2016 02:16:36 +1000 Received: from d23relay09.au.ibm.com (d23relay09.au.ibm.com [9.185.63.181]) by d23dlp01.au.ibm.com (Postfix) with ESMTP id 4D5C32CE802D for ; Fri, 22 Jan 2016 03:16:32 +1100 (EST) Received: from d23av03.au.ibm.com (d23av03.au.ibm.com [9.190.234.97]) by d23relay09.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id u0LGGOKS51052732 for ; Fri, 22 Jan 2016 03:16:32 +1100 Received: from d23av03.au.ibm.com (localhost [127.0.0.1]) by d23av03.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id u0LGFwOS027895 for ; Fri, 22 Jan 2016 03:15:59 +1100 From: Vasant Hegde To: linuxppc-dev@lists.ozlabs.org Cc: Vasant Hegde , Dan Williams , Nathan Fontenot , Michael Ellerman Subject: [PATCH] powerpc/mm: Allow user space to map rtas_rmo_buf Date: Thu, 21 Jan 2016 21:45:31 +0530 Message-Id: <1453392931-20707-1-git-send-email-hegdevasant@linux.vnet.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , With commit 90a545e9 (restrict /dev/mem to idle io memory ranges) mapping rtas_rmo_buf from user space is failing. Hence we are not able to make RTAS syscall. This patch calls page_is_rtas_user_buf before calling iomem_is_exclusive in devmem_is_allowed(). This will allow user space to map rtas_rmo_buf and we are able to make RTAS syscall. Reported-by: Bharata B Rao CC: Dan Williams CC: Nathan Fontenot CC: Michael Ellerman Signed-off-by: Vasant Hegde --- arch/powerpc/mm/mem.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c index 22d94c3..d0f0a51 100644 --- a/arch/powerpc/mm/mem.c +++ b/arch/powerpc/mm/mem.c @@ -560,12 +560,12 @@ subsys_initcall(add_system_ram_resources); */ int devmem_is_allowed(unsigned long pfn) { + if (page_is_rtas_user_buf(pfn)) + return 1; if (iomem_is_exclusive(PFN_PHYS(pfn))) return 0; if (!page_is_ram(pfn)) return 1; - if (page_is_rtas_user_buf(pfn)) - return 1; return 0; } #endif /* CONFIG_STRICT_DEVMEM */ -- 2.1.0