{"id":2221897,"url":"http://patchwork.ozlabs.org/api/1.2/patches/2221897/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-ext4/patch/20260410120320.081003009@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":"<20260410120320.081003009@kernel.org>","list_archive_url":null,"date":"2026-04-10T12:21:28","name":"[37/38] x86: Select ARCH_HAS_RANDOM_ENTROPY","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"a191b4b6273f6e9013a6a6c709be3d6ea6f3389f","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/20260410120320.081003009@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/2221897/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2221897/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=jCHje7Cb;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=ozlabs.org\n (client-ip=150.107.74.76; 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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=1775823691;\n\tbh=Q+IGONPkRqfayguG6Txkx/mXXA1oIi3CJxpKCndboyw=;\n\th=Date:From:To:Cc:Subject:References:From;\n\tb=jCHje7Cbtua5yolIUEErxzzrufBxMW0LYt1Kl8DVF/tR3HVJLQOi/32jC1MsFj4sU\n\t FuxQN5MUq6aUGx6W7VIPg9yzFSdqaZMbr1tHN5zCNxM830u3a1p54HzWCg2l8d0SzU\n\t xyIH4nNx8yib1hODU1iz6RiEcKM7mp5gg40/5f4Y1z++7yY40Cew7vRxlBQZnDz2BW\n\t SRGp9xUTNtuoCzThvYns7ndknYQX1oh8mSimdrkytbEv0fT97jYIikQFCA2/G5YDNs\n\t jkUQfDUfGpJwZkehI6Gounl+WGkLz5eknKnsUFvTrSUQCfxc7Qg1pWGasV1G+9O2Ak\n\t 9A3OklGLFCHng==","Date":"Fri, 10 Apr 2026 14:21:28 +0200","Message-ID":"<20260410120320.081003009@kernel.org>","User-Agent":"quilt/0.68","From":"Thomas Gleixner ","To":"LKML ","Cc":"x86@kernel.org,\n Arnd Bergmann ,\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 Russell King ,\n linux-arm-kernel@lists.infradead.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 37/38] x86: 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 random_get_entropy().\n\nSwitch x86 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: x86@kernel.org\n---\n arch/x86/Kconfig | 1 +\n arch/x86/include/asm/random.h | 16 ++++++++++++++++\n arch/x86/include/asm/timex.h | 17 -----------------\n arch/x86/include/asm/tsc.h | 9 ---------\n 4 files changed, 17 insertions(+), 26 deletions(-)","diff":"--- a/arch/x86/Kconfig\n+++ b/arch/x86/Kconfig\n@@ -101,6 +101,7 @@ config X86\n \tselect ARCH_HAS_PREEMPT_LAZY\n \tselect ARCH_HAS_PTDUMP\n \tselect ARCH_HAS_PTE_SPECIAL\n+\tselect ARCH_HAS_RANDOM_ENTROPY\n \tselect ARCH_HAS_HW_PTE_YOUNG\n \tselect ARCH_HAS_NONLEAF_PMD_YOUNG\tif PGTABLE_LEVELS > 2\n \tselect ARCH_HAS_UACCESS_FLUSHCACHE\tif X86_64\n--- /dev/null\n+++ b/arch/x86/include/asm/random.h\n@@ -0,0 +1,16 @@\n+/* SPDX-License-Identifier: GPL-2.0 */\n+#ifndef _ASM_X86_RANDOM_H\n+#define _ASM_X86_RANDOM_H\n+\n+#include \n+#include \n+\n+static inline unsigned long random_get_entropy(void)\n+{\n+\tif (!IS_ENABLED(CONFIG_X86_TSC) &&\n+\t !cpu_feature_enabled(X86_FEATURE_TSC))\n+\t\treturn random_get_entropy_fallback();\n+\treturn rdtsc();\n+}\n+\n+#endif /* _ASM_X86_RANDOM_H */\n--- a/arch/x86/include/asm/timex.h\n+++ /dev/null\n@@ -1,17 +0,0 @@\n-/* SPDX-License-Identifier: GPL-2.0 */\n-#ifndef _ASM_X86_TIMEX_H\n-#define _ASM_X86_TIMEX_H\n-\n-#include \n-#include \n-\n-static inline unsigned long random_get_entropy(void)\n-{\n-\tif (!IS_ENABLED(CONFIG_X86_TSC) &&\n-\t !cpu_feature_enabled(X86_FEATURE_TSC))\n-\t\treturn random_get_entropy_fallback();\n-\treturn rdtsc();\n-}\n-#define random_get_entropy random_get_entropy\n-\n-#endif /* _ASM_X86_TIMEX_H */\n--- a/arch/x86/include/asm/tsc.h\n+++ b/arch/x86/include/asm/tsc.h\n@@ -72,15 +72,6 @@ extern unsigned int tsc_khz;\n \n extern void disable_TSC(void);\n \n-static inline cycles_t get_cycles(void)\n-{\n-\tif (!IS_ENABLED(CONFIG_X86_TSC) &&\n-\t !cpu_feature_enabled(X86_FEATURE_TSC))\n-\t\treturn 0;\n-\treturn rdtsc();\n-}\n-#define get_cycles get_cycles\n-\n extern void tsc_early_init(void);\n extern void tsc_init(void);\n extern void mark_tsc_unstable(char *reason);\n","prefixes":["37/38"]}