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Donenfeld" , Richard Henderson , linux-alpha@vger.kernel.org, Catalin Marinas , Huacai Chen , loongarch@lists.linux.dev, Geert Uytterhoeven , linux-m68k@lists.linux-m68k.org, Dinh Nguyen , Jonas Bonn , linux-openrisc@vger.kernel.org, Helge Deller , linux-parisc@vger.kernel.org, Michael Ellerman , linuxppc-dev@lists.ozlabs.org, Paul Walmsley , linux-riscv@lists.infradead.org, Heiko Carstens , linux-s390@vger.kernel.org, "David S. Miller" , sparclinux@vger.kernel.org Subject: [patch 24/38] ARM: Select ARCH_HAS_RANDOM_ENTROPY References: <20260410120044.031381086@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-Rspamd-Queue-Id: 7395A120015 X-Stat-Signature: 4brbioacy9rqzd3rey3jsqw3osdms6gd X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1775823630-298460 X-HE-Meta: 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 MXppM3aT 5wWWZLmr+1trRyHS7KJzERyKMkmaxz2iNf6JGlEq+guVi1bwu2gtpANqPzenea655cRDHAxqi+yosPTnHRIDjA7z1m2uw6Yygm3SKqdf9cM836FKgKas/UUHZjWU9SNfZYAEsoleGJlvE2F78yaCs79IrqrTkq0C5N4k9PmfW7EL8dzKefV5d3jzqfD3RqLT11hsjwBFviTbn1L5uYd1bd2BQi6MQEhh76x4YOK8NAyGNF1VpqL0pJGRCRTLA9O7rTZX6T94dpqk9Omhwaq9NHeBRqCqdwPzy2gUrIFqiBNTPLsxd4wvwTpjbb8SySLZZm1J38sjZeWjYfAq9mfiE4n9FfGOMkbhMuW+Y8bC4UqSwDkiWEXa5EZ2RCNMZU/esB2wfGU/JwTq+a6m9H9MSTlipfJOIdmWNcC6gw24C9MLyHf69lG+VfJmkQVl9HoV83f+DdUqe/Ees0A2li8bV44Dl0ZS6aSbB2JPj Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: The only remaining usage of get_cycles() is to provide random_get_entropy(). Switch ARM over to the new scheme of selecting ARCH_HAS_RANDOM_ENTROPY and providing random_get_entropy() in asm/random.h. Remove asm/timex.h as it has no functionality anymore. Signed-off-by: Thomas Gleixner Cc: Russell King Cc: linux-arm-kernel@lists.infradead.org --- arch/arm/Kconfig | 1 + arch/arm/include/asm/random.h | 14 ++++++++++++++ arch/arm/include/asm/timex.h | 18 ------------------ arch/arm/lib/delay.c | 4 ++-- 4 files changed, 17 insertions(+), 20 deletions(-) --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -22,6 +22,7 @@ config ARM select ARCH_HAS_MEMBARRIER_SYNC_CORE select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE select ARCH_HAS_PTE_SPECIAL if ARM_LPAE + select ARCH_HAS_RANDOM_ENTROPY select ARCH_HAS_SETUP_DMA_OPS select ARCH_HAS_SET_MEMORY select ARCH_STACKWALK --- /dev/null +++ b/arch/arm/include/asm/random.h @@ -0,0 +1,14 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#ifndef _ASMARM_RANDOM_H +#define _ASMARM_RANDOM_H + +bool delay_read_timer(unsigned long *t); + +static inline unsigned long random_get_entropy(void) +{ + unsigned long t; + + return delay_read_timer(&t) ? t : random_get_entropy_fallback(); +} + +#endif --- a/arch/arm/include/asm/timex.h +++ /dev/null @@ -1,18 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0-only */ -/* - * arch/arm/include/asm/timex.h - * - * Copyright (C) 1997,1998 Russell King - * - * Architecture Specific TIME specifications - */ -#ifndef _ASMARM_TIMEX_H -#define _ASMARM_TIMEX_H - -// Temporary workaround -bool delay_read_timer(unsigned long *t); - -#define get_cycles() ({ cycles_t c; delay_read_timer(&c) ? 0 : c; }) -#define random_get_entropy() (((unsigned long)get_cycles()) ?: random_get_entropy_fallback()) - -#endif --- a/arch/arm/lib/delay.c +++ b/arch/arm/lib/delay.c @@ -42,9 +42,9 @@ static inline u64 cyc_to_ns(u64 cyc, u32 static void __timer_delay(unsigned long cycles) { - cycles_t start = get_cycles(); + cycles_t start = delay_timer->read_current_timer(); - while ((get_cycles() - start) < cycles) + while ((delay_timer->read_current_timer() - start) < cycles) cpu_relax(); }