Hi Uwe, I love your patch! Yet something to improve: [auto build test ERROR on tty/tty-testing] [also build test ERROR on v4.17-rc3 next-20180503] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Uwe-Kleine-K-nig/tty-implement-led-triggers/20180504-075232 base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git tty-testing config: i386-randconfig-x014-201817 (attached as .config) compiler: gcc-7 (Debian 7.3.0-16) 7.3.0 reproduce: # save the attached .config to linux build tree make ARCH=i386 All errors (new ones prefixed by >>): drivers/tty/tty_io.c: In function 'do_tty_write': >> drivers/tty/tty_io.c:962:38: error: 'struct tty_port' has no member named 'led_trigger_tx' led_trigger_blink_oneshot(tty->port->led_trigger_tx, &delay, &delay, 0); ^~ -- drivers/tty/tty_buffer.c: In function 'flush_to_ldisc': >> drivers/tty/tty_buffer.c:526:33: error: 'struct tty_port' has no member named 'led_trigger_rx' led_trigger_blink_oneshot(port->led_trigger_rx, &delay, &delay, 0); ^~ vim +962 drivers/tty/tty_io.c 893 894 /* 895 * Split writes up in sane blocksizes to avoid 896 * denial-of-service type attacks 897 */ 898 static inline ssize_t do_tty_write( 899 ssize_t (*write)(struct tty_struct *, struct file *, const unsigned char *, size_t), 900 struct tty_struct *tty, 901 struct file *file, 902 const char __user *buf, 903 size_t count) 904 { 905 ssize_t ret, written = 0; 906 unsigned int chunk; 907 908 ret = tty_write_lock(tty, file->f_flags & O_NDELAY); 909 if (ret < 0) 910 return ret; 911 912 /* 913 * We chunk up writes into a temporary buffer. This 914 * simplifies low-level drivers immensely, since they 915 * don't have locking issues and user mode accesses. 916 * 917 * But if TTY_NO_WRITE_SPLIT is set, we should use a 918 * big chunk-size.. 919 * 920 * The default chunk-size is 2kB, because the NTTY 921 * layer has problems with bigger chunks. It will 922 * claim to be able to handle more characters than 923 * it actually does. 924 * 925 * FIXME: This can probably go away now except that 64K chunks 926 * are too likely to fail unless switched to vmalloc... 927 */ 928 chunk = 2048; 929 if (test_bit(TTY_NO_WRITE_SPLIT, &tty->flags)) 930 chunk = 65536; 931 if (count < chunk) 932 chunk = count; 933 934 /* write_buf/write_cnt is protected by the atomic_write_lock mutex */ 935 if (tty->write_cnt < chunk) { 936 unsigned char *buf_chunk; 937 938 if (chunk < 1024) 939 chunk = 1024; 940 941 buf_chunk = kmalloc(chunk, GFP_KERNEL); 942 if (!buf_chunk) { 943 ret = -ENOMEM; 944 goto out; 945 } 946 kfree(tty->write_buf); 947 tty->write_cnt = chunk; 948 tty->write_buf = buf_chunk; 949 } 950 951 /* Do the write .. */ 952 for (;;) { 953 size_t size = count; 954 unsigned long delay = 50 /* ms */; 955 956 if (size > chunk) 957 size = chunk; 958 ret = -EFAULT; 959 if (copy_from_user(tty->write_buf, buf, size)) 960 break; 961 > 962 led_trigger_blink_oneshot(tty->port->led_trigger_tx, &delay, &delay, 0); 963 964 ret = write(tty, file, tty->write_buf, size); 965 if (ret <= 0) 966 break; 967 written += ret; 968 buf += ret; 969 count -= ret; 970 if (!count) 971 break; 972 ret = -ERESTARTSYS; 973 if (signal_pending(current)) 974 break; 975 cond_resched(); 976 } 977 if (written) { 978 tty_update_time(&file_inode(file)->i_mtime); 979 ret = written; 980 } 981 out: 982 tty_write_unlock(tty); 983 return ret; 984 } 985 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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