{"id":2221909,"url":"http://patchwork.ozlabs.org/api/1.2/patches/2221909/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-ext4/patch/20260410120319.197793115@kernel.org/","project":{"id":8,"url":"http://patchwork.ozlabs.org/api/1.2/projects/8/?format=json","name":"Linux ext4 filesystem development","link_name":"linux-ext4","list_id":"linux-ext4.vger.kernel.org","list_email":"linux-ext4@vger.kernel.org","web_url":null,"scm_url":null,"webscm_url":null,"list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<20260410120319.197793115@kernel.org>","list_archive_url":null,"date":"2026-04-10T12:20:26","name":"[24/38] ARM: Select ARCH_HAS_RANDOM_ENTROPY","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"64f91334fb736f10262e0502ff3000000371c68a","submitter":{"id":92397,"url":"http://patchwork.ozlabs.org/api/1.2/people/92397/?format=json","name":"Thomas Gleixner","email":"tglx@kernel.org"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-ext4/patch/20260410120319.197793115@kernel.org/mbox/","series":[{"id":499451,"url":"http://patchwork.ozlabs.org/api/1.2/series/499451/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-ext4/list/?series=499451","date":"2026-04-10T12:18:27","name":"treewide: Cleanup LATCH, CLOCK_TICK_RATE and get_cycles() [ab]use","version":1,"mbox":"http://patchwork.ozlabs.org/series/499451/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2221909/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2221909/checks/","tags":{},"related":[],"headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-ext4@vger.kernel.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","patchwork-incoming@ozlabs.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=UacNbv5z;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=ozlabs.org\n (client-ip=2404:9400:2221:ea00::3; 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arc=none smtp.client-ip=10.30.226.201"],"DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n\ts=k20201202; t=1775823629;\n\tbh=Xj914OB0ywB5KtjAdUFbVTIri4m7J0/9GAWloccpVyg=;\n\th=Date:From:To:Cc:Subject:References:From;\n\tb=UacNbv5zzA6AzbAlRM4n4U5NaKejyQd8mANj0iWZ5RQiRAJWixjyMgZjbiDhDTyzO\n\t ay62PPnTA47MG/rmdeWa/4KfjNAnW4xtTzJ34RAhThlg0KY8nNByGNrsu9zE469dPQ\n\t hWtTJvAZ4ZE2brA8ZCckIrkzYMvi5clv/chlzjJ3PYteh92RUSFzhMNQu3+ZTJTDCI\n\t kJ6mPTSZ1AZhD1XvkSSEOtM9nEZR/77fxCsYwUjbpiFSE3ESK6EP7pbE6Ao/WrdTRD\n\t AlaT3EdsheI/WmWdaf0zz7rbsJUIcktKioLIztC89PcrEqXmxk39mPCnXjzI5yFh8X\n\t xNx6W4PqnkQAQ==","Date":"Fri, 10 Apr 2026 14:20:26 +0200","Message-ID":"<20260410120319.197793115@kernel.org>","User-Agent":"quilt/0.68","From":"Thomas Gleixner ","To":"LKML ","Cc":"Russell King ,\n linux-arm-kernel@lists.infradead.org,\n Arnd Bergmann ,\n x86@kernel.org,\n Lu Baolu ,\n iommu@lists.linux.dev,\n Michael Grzeschik ,\n netdev@vger.kernel.org,\n linux-wireless@vger.kernel.org,\n Herbert Xu ,\n linux-crypto@vger.kernel.org,\n Vlastimil Babka ,\n linux-mm@kvack.org,\n David Woodhouse ,\n Bernie Thompson ,\n linux-fbdev@vger.kernel.org,\n \"Theodore Tso\" ,\n linux-ext4@vger.kernel.org,\n Andrew Morton ,\n Uladzislau Rezki ,\n Marco Elver ,\n Dmitry Vyukov ,\n kasan-dev@googlegroups.com,\n Andrey Ryabinin ,\n Thomas Sailer ,\n linux-hams@vger.kernel.org,\n \"Jason A. Donenfeld\" ,\n Richard Henderson ,\n linux-alpha@vger.kernel.org,\n Catalin Marinas ,\n Huacai Chen ,\n loongarch@lists.linux.dev,\n Geert Uytterhoeven ,\n linux-m68k@lists.linux-m68k.org,\n Dinh Nguyen ,\n Jonas Bonn ,\n linux-openrisc@vger.kernel.org,\n Helge Deller ,\n linux-parisc@vger.kernel.org,\n Michael Ellerman ,\n linuxppc-dev@lists.ozlabs.org,\n Paul Walmsley ,\n linux-riscv@lists.infradead.org,\n Heiko Carstens ,\n linux-s390@vger.kernel.org,\n \"David S. Miller\" ,\n sparclinux@vger.kernel.org","Subject":"[patch 24/38] ARM: Select ARCH_HAS_RANDOM_ENTROPY","References":"<20260410120044.031381086@kernel.org>","Precedence":"bulk","X-Mailing-List":"linux-ext4@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","Content-Type":"text/plain; charset=UTF-8","X-Spam-Status":"No, score=-1.2 required=5.0 tests=ARC_SIGNED,ARC_VALID,\n\tDKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DMARC_PASS,\n\tMAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=disabled\n\tversion=4.0.1","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on gandalf.ozlabs.org"},"content":"The only remaining usage of get_cycles() is to provide\nrandom_get_entropy().\n\nSwitch ARM over to the new scheme of selecting ARCH_HAS_RANDOM_ENTROPY and\nproviding random_get_entropy() in asm/random.h.\n\nRemove asm/timex.h as it has no functionality anymore.\n\nSigned-off-by: Thomas Gleixner \nCc: Russell King \nCc: linux-arm-kernel@lists.infradead.org\n---\n arch/arm/Kconfig | 1 +\n arch/arm/include/asm/random.h | 14 ++++++++++++++\n arch/arm/include/asm/timex.h | 18 ------------------\n arch/arm/lib/delay.c | 4 ++--\n 4 files changed, 17 insertions(+), 20 deletions(-)","diff":"--- a/arch/arm/Kconfig\n+++ b/arch/arm/Kconfig\n@@ -22,6 +22,7 @@ config ARM\n \tselect ARCH_HAS_MEMBARRIER_SYNC_CORE\n \tselect ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE\n \tselect ARCH_HAS_PTE_SPECIAL if ARM_LPAE\n+\tselect ARCH_HAS_RANDOM_ENTROPY\n \tselect ARCH_HAS_SETUP_DMA_OPS\n \tselect ARCH_HAS_SET_MEMORY\n \tselect ARCH_STACKWALK\n--- /dev/null\n+++ b/arch/arm/include/asm/random.h\n@@ -0,0 +1,14 @@\n+/* SPDX-License-Identifier: GPL-2.0-only */\n+#ifndef _ASMARM_RANDOM_H\n+#define _ASMARM_RANDOM_H\n+\n+bool delay_read_timer(unsigned long *t);\n+\n+static inline unsigned long random_get_entropy(void)\n+{\n+\tunsigned long t;\n+\n+\treturn delay_read_timer(&t) ? t : random_get_entropy_fallback();\n+}\n+\n+#endif\n--- a/arch/arm/include/asm/timex.h\n+++ /dev/null\n@@ -1,18 +0,0 @@\n-/* SPDX-License-Identifier: GPL-2.0-only */\n-/*\n- * arch/arm/include/asm/timex.h\n- *\n- * Copyright (C) 1997,1998 Russell King\n- *\n- * Architecture Specific TIME specifications\n- */\n-#ifndef _ASMARM_TIMEX_H\n-#define _ASMARM_TIMEX_H\n-\n-// Temporary workaround\n-bool delay_read_timer(unsigned long *t);\n-\n-#define get_cycles()\t({ cycles_t c; delay_read_timer(&c) ? 0 : c; })\n-#define random_get_entropy() (((unsigned long)get_cycles()) ?: random_get_entropy_fallback())\n-\n-#endif\n--- a/arch/arm/lib/delay.c\n+++ b/arch/arm/lib/delay.c\n@@ -42,9 +42,9 @@ static inline u64 cyc_to_ns(u64 cyc, u32\n \n static void __timer_delay(unsigned long cycles)\n {\n-\tcycles_t start = get_cycles();\n+\tcycles_t start = delay_timer->read_current_timer();\n \n-\twhile ((get_cycles() - start) < cycles)\n+\twhile ((delay_timer->read_current_timer() - start) < cycles)\n \t\tcpu_relax();\n }\n \n","prefixes":["24/38"]}