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Mon, 20 Apr 2020 13:58:14 -0700 (PDT) From: Alexey Dobriyan To: akpm@linux-foundation.org Cc: adobriyan@gmail.com, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, pmladek@suse.com, rostedt@goodmis.org, sergey.senozhatsky@gmail.com, andriy.shevchenko@linux.intel.com, linux@rasmusvillemoes.dk Subject: [PATCH 08/15] print_integer, proc: rewrite /proc/uptime via print_integer() Date: Mon, 20 Apr 2020 23:57:36 +0300 Message-Id: <20200420205743.19964-8-adobriyan@gmail.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200420205743.19964-1-adobriyan@gmail.com> References: <20200420205743.19964-1-adobriyan@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Signed-off-by: Alexey Dobriyan --- fs/proc/uptime.c | 24 +++++++++++++++++++----- 1 file changed, 19 insertions(+), 5 deletions(-) diff --git a/fs/proc/uptime.c b/fs/proc/uptime.c index 5a1b228964fb..a8190078d595 100644 --- a/fs/proc/uptime.c +++ b/fs/proc/uptime.c @@ -8,10 +8,14 @@ #include #include +#include "../../lib/print-integer.h" + static int uptime_proc_show(struct seq_file *m, void *v) { struct timespec64 uptime; struct timespec64 idle; + char buf[(LEN_UL + 1 + 2 + 1) * 2]; + char *p = buf + sizeof(buf); u64 nsec; u32 rem; int i; @@ -25,11 +29,21 @@ static int uptime_proc_show(struct seq_file *m, void *v) idle.tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem); idle.tv_nsec = rem; - seq_printf(m, "%lu.%02lu %lu.%02lu\n", - (unsigned long) uptime.tv_sec, - (uptime.tv_nsec / (NSEC_PER_SEC / 100)), - (unsigned long) idle.tv_sec, - (idle.tv_nsec / (NSEC_PER_SEC / 100))); + + *--p = '\n'; + --p; /* overwritten */ + *--p = '0'; + (void)_print_integer_u32(p + 2, idle.tv_nsec / (NSEC_PER_SEC / 100)); + *--p = '.'; + p = _print_integer_ul(p, (unsigned long)idle.tv_sec); + *--p = ' '; + --p; /* overwritten */ + *--p = '0'; + (void)_print_integer_u32(p + 2, uptime.tv_nsec / (NSEC_PER_SEC / 100)); + *--p = '.'; + p = _print_integer_ul(p, (unsigned long)uptime.tv_sec); + + seq_write(m, p, buf + sizeof(buf) - p); return 0; } -- 2.24.1