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Tue, 02 Jun 2020 11:46:30 -0700 (PDT) From: Souptick Joarder To: gregkh@linuxfoundation.org, jamal.k.shareef@gmail.com, dan.carpenter@oracle.com, marcgonzalez@google.com, hariprasad.kelam@gmail.com, tasman@leaflabs.com, nachukannan@gmail.com Subject: [PATCH] staging: vc04_services: Convert get_user_pages*() --> pin_user_pages*() Date: Wed, 3 Jun 2020 00:24:17 +0530 Message-Id: <1591124057-27696-1-git-send-email-jrdr.linux@gmail.com> X-Mailer: git-send-email 1.9.1 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200602_114633_505706_4851E0A0 X-CRM114-Status: GOOD ( 11.04 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devel@driverdev.osuosl.org, John Hubbard , linux-kernel@vger.kernel.org, bcm-kernel-feedback-list@broadcom.com, Souptick Joarder , linux-arm-kernel@lists.infradead.org, linux-rpi-kernel@lists.infradead.org MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org In 2019, we introduced pin_user_pages*() and now we are converting get_user_pages*() to the new API as appropriate. [1] & [2] could be referred for more information. [1] Documentation/core-api/pin_user_pages.rst [2] "Explicit pinning of user-space pages": https://lwn.net/Articles/807108/ Signed-off-by: Souptick Joarder Cc: John Hubbard --- Hi, I'm compile tested this, but unable to run-time test, so any testing help is much appriciated. .../vc04_services/interface/vchiq_arm/vchiq_2835_arm.c | 16 +++++----------- 1 file changed, 5 insertions(+), 11 deletions(-) diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c index 38a13e4..4616013 100644 --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c @@ -287,12 +287,8 @@ int vchiq_dump_platform_state(void *dump_context) pagelistinfo->num_pages, pagelistinfo->dma_dir); } - if (pagelistinfo->pages_need_release) { - unsigned int i; - - for (i = 0; i < pagelistinfo->num_pages; i++) - put_page(pagelistinfo->pages[i]); - } + if (pagelistinfo->pages_need_release) + unpin_user_pages(pagelistinfo->pages, pagelistinfo->num_pages); dma_free_coherent(g_dev, pagelistinfo->pagelist_buffer_size, pagelistinfo->pagelist, pagelistinfo->dma_addr); @@ -395,7 +391,7 @@ int vchiq_dump_platform_state(void *dump_context) } /* do not try and release vmalloc pages */ } else { - actual_pages = get_user_pages_fast( + actual_pages = pin_user_pages_fast( (unsigned long)buf & PAGE_MASK, num_pages, type == PAGELIST_READ, @@ -407,10 +403,8 @@ int vchiq_dump_platform_state(void *dump_context) __func__, actual_pages, num_pages); /* This is probably due to the process being killed */ - while (actual_pages > 0) { - actual_pages--; - put_page(pages[actual_pages]); - } + if (actual_pages > 0) + unpin_user_pages(pages, actual_pages); cleanup_pagelistinfo(pagelistinfo); return NULL; } -- 1.9.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel