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Donenfeld" , Richard Henderson , linux-alpha@vger.kernel.org, Russell King , linux-arm-kernel@lists.infradead.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 17/38] ext4: Replace get_cycles() usage with ktime_get() References: <20260410120044.031381086@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 2553240003 X-Stat-Signature: hqjcie8nrj9dki3hhp9k1fgnxhacsnqt X-Rspam-User: X-HE-Tag: 1775823595-463973 X-HE-Meta: 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 +6tUipqs NLvxTiBhm97wx1fXzgKVspgFJAfUWBMh2MWqX7pDkoNbVt8kyEQW9ZHGreFY5ZVGWzdluiJPKkybyTykivT1aDW/HcqH2YsfG7AwEqmEc1q4Oq1hp4w1Mm2P15+mGdQySg9TTv0cKNnYNRExJJ/xBoctwyQhZ9Kx1pvrPdpHTWdvOYDE7mvd75tybWO7ckzAsPbcuABYJLcFvLXWGeYDN9RwP8Mqutv/zK3pelyeI2wW2Px05B8TygP1CIY5B50HXYOwaZeJvI0p7yiFIqv8B4o1saAj+NNC2QB+o+m2OVI4VOjs8OHeXveLDRrJS4AcZWZL9z0aRQMgyIHgYDG0MkOBvWue8jb1NoT1OrBl8a4K8QJI= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: get_cycles() is not guaranteed to be functional on all systems/platforms and the values returned are unitless and not easy to map to something useful. Use ktime_get() instead, which provides nanosecond timestamps and is functional everywhere. This is part of a larger effort to limit get_cycles() usage to low level architecture code. Signed-off-by: Thomas Gleixner Cc: "Theodore Ts'o" Cc: linux-ext4@vger.kernel.org --- fs/ext4/mballoc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -1289,7 +1289,7 @@ void ext4_mb_generate_buddy(struct super ext4_grpblk_t len; unsigned free = 0; unsigned fragments = 0; - unsigned long long period = get_cycles(); + ktime_t period = ktime_get(); /* initialize buddy from bitmap which is aggregation * of on-disk bitmap and preallocations */ @@ -1328,7 +1328,7 @@ void ext4_mb_generate_buddy(struct super clear_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &(grp->bb_state)); - period = get_cycles() - period; + period = ktime_get() - period; atomic_inc(&sbi->s_mb_buddies_generated); atomic64_add(period, &sbi->s_mb_generation_time); }