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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> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 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); }