From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-x243.google.com (mail-pf0-x243.google.com [IPv6:2607:f8b0:400e:c00::243]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 41HQl42JFWzF1kY for ; Sat, 30 Jun 2018 04:53:00 +1000 (AEST) Received: by mail-pf0-x243.google.com with SMTP id s21-v6so4611203pfm.6 for ; Fri, 29 Jun 2018 11:53:00 -0700 (PDT) Date: Fri, 29 Jun 2018 11:52:54 -0700 From: Kees Cook To: Benjamin Herrenschmidt Cc: Paul Mackerras , Michael Ellerman , Andrew Morton , Randy Dunlap , Tyrel Datwyler , Rob Herring , Ingo Molnar , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Subject: [PATCH] powerpc/msi: Remove VLA usage Message-ID: <20180629185254.GA37557@beast> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , In the quest to remove all stack VLA usage from the kernel[1], this switches from an unchanging variable to a constant expression to eliminate the VLA generation. [1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Michael Ellerman Cc: Andrew Morton Cc: Randy Dunlap Cc: Tyrel Datwyler Cc: Rob Herring Cc: Ingo Molnar Cc: linuxppc-dev@lists.ozlabs.org Signed-off-by: Kees Cook --- arch/powerpc/sysdev/msi_bitmap.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) diff --git a/arch/powerpc/sysdev/msi_bitmap.c b/arch/powerpc/sysdev/msi_bitmap.c index 6243a7e537d0..e64a411d1a00 100644 --- a/arch/powerpc/sysdev/msi_bitmap.c +++ b/arch/powerpc/sysdev/msi_bitmap.c @@ -225,22 +225,23 @@ static void __init test_of_node(void) struct device_node of_node; struct property prop; struct msi_bitmap bmp; - int size = 256; - DECLARE_BITMAP(expected, size); +#define SIZE_EXPECTED 256 + DECLARE_BITMAP(expected, SIZE_EXPECTED); /* There should really be a struct device_node allocator */ memset(&of_node, 0, sizeof(of_node)); of_node_init(&of_node); of_node.full_name = node_name; - WARN_ON(msi_bitmap_alloc(&bmp, size, &of_node)); + WARN_ON(msi_bitmap_alloc(&bmp, SIZE_EXPECTED, &of_node)); /* No msi-available-ranges, so expect > 0 */ WARN_ON(msi_bitmap_reserve_dt_hwirqs(&bmp) <= 0); /* Should all still be free */ - WARN_ON(bitmap_find_free_region(bmp.bitmap, size, get_count_order(size))); - bitmap_release_region(bmp.bitmap, 0, get_count_order(size)); + WARN_ON(bitmap_find_free_region(bmp.bitmap, SIZE_EXPECTED, + get_count_order(SIZE_EXPECTED))); + bitmap_release_region(bmp.bitmap, 0, get_count_order(SIZE_EXPECTED)); /* Now create a fake msi-available-ranges property */ @@ -256,8 +257,8 @@ static void __init test_of_node(void) WARN_ON(msi_bitmap_reserve_dt_hwirqs(&bmp)); /* Check we got the expected result */ - WARN_ON(bitmap_parselist(expected_str, expected, size)); - WARN_ON(!bitmap_equal(expected, bmp.bitmap, size)); + WARN_ON(bitmap_parselist(expected_str, expected, SIZE_EXPECTED)); + WARN_ON(!bitmap_equal(expected, bmp.bitmap, SIZE_EXPECTED)); msi_bitmap_free(&bmp); kfree(bmp.bitmap); -- 2.17.1 -- Kees Cook Pixel Security