From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vishal Verma Subject: [PATCH 5/6] acpi: change memory allocations to GFP_NOIO Date: Fri, 14 Jul 2017 16:11:47 -0600 Message-ID: <20170714221148.11232-6-vishal.l.verma@intel.com> References: <20170714221148.11232-1-vishal.l.verma@intel.com> Return-path: Received: from mga06.intel.com ([134.134.136.31]:30967 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751118AbdGNWNc (ORCPT ); Fri, 14 Jul 2017 18:13:32 -0400 In-Reply-To: <20170714221148.11232-1-vishal.l.verma@intel.com> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: linux-nvdimm@lists.01.org Cc: linux-acpi@vger.kernel.org, Dan Williams , Jeff Moyer , "Rafael J. Wysocki" , Toshi Kani , Vishal Verma With the ACPI NFIT 'DSM' methods, acpi can be called from IO paths. Specifically, the DSM to clear media errors is called during writes, so that we can provide a writes-fix-errors model. However it is easy to imagine a scenario like: - write through the nvdimm driver - acpi allocation - writeback, causes more IO through the nvdimm driver - deadlock Making the acpi allocations GPF_NOIO would ensure that it doesn't trigger writeback, and avoids the above deadlock. Cc: Cc: Cc: Dan Williams Cc: Rafael J. Wysocki Signed-off-by: Vishal Verma --- include/acpi/platform/aclinuxex.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/include/acpi/platform/aclinuxex.h b/include/acpi/platform/aclinuxex.h index efdff52..9bd54ec 100644 --- a/include/acpi/platform/aclinuxex.h +++ b/include/acpi/platform/aclinuxex.h @@ -83,12 +83,12 @@ acpi_status acpi_os_terminate(void); */ static inline void *acpi_os_allocate(acpi_size size) { - return kmalloc(size, irqs_disabled()? GFP_ATOMIC : GFP_KERNEL); + return kmalloc(size, irqs_disabled()? GFP_ATOMIC : GFP_NOIO); } static inline void *acpi_os_allocate_zeroed(acpi_size size) { - return kzalloc(size, irqs_disabled()? GFP_ATOMIC : GFP_KERNEL); + return kzalloc(size, irqs_disabled()? GFP_ATOMIC : GFP_NOIO); } static inline void acpi_os_free(void *memory) @@ -99,7 +99,7 @@ static inline void acpi_os_free(void *memory) static inline void *acpi_os_acquire_object(acpi_cache_t * cache) { return kmem_cache_zalloc(cache, - irqs_disabled()? GFP_ATOMIC : GFP_KERNEL); + irqs_disabled()? GFP_ATOMIC : GFP_NOIO); } static inline acpi_thread_id acpi_os_get_thread_id(void) -- 2.9.3