diff options
| -rw-r--r-- | drivers/tty/serial/earlycon.c | 23 | ||||
| -rw-r--r-- | init/main.c | 5 | ||||
| -rw-r--r-- | kernel/printk/printk.c | 26 |
3 files changed, 46 insertions, 8 deletions
diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c index a5fbb6ed38ae..ab9af37f6cda 100644 --- a/drivers/tty/serial/earlycon.c +++ b/drivers/tty/serial/earlycon.c @@ -248,6 +248,29 @@ static int __init param_setup_earlycon(char *buf) } early_param("earlycon", param_setup_earlycon); +/* + * The `console` parameter is overloaded. It's handled here as an early param + * and in `printk.c` as a late param. It's possible to specify an early + * `bootconsole` using `earlycon=uartXXXX` (handled above), or via + * the `console=uartXXX` alias. See the comment in `8250_early.c`. + */ +static int __init param_setup_earlycon_console_alias(char *buf) +{ + /* + * A plain `console` parameter must not enable the SPCR `bootconsole` + * like a plain `earlycon` does. + * + * A `console=` parameter that specifies an empty value is used to + * disable the `console`, not the `earlycon` `bootconsole`. The + * disabling of the `console` is handled by `printk.c`. + */ + if (!buf || !buf[0]) + return 0; + + return param_setup_earlycon(buf); +} +early_param("console", param_setup_earlycon_console_alias); + #ifdef CONFIG_OF_EARLY_FLATTREE int __init of_setup_earlycon(const struct earlycon_id *match, diff --git a/init/main.c b/init/main.c index c4778edae797..00fac1170294 100644 --- a/init/main.c +++ b/init/main.c @@ -754,10 +754,7 @@ static int __init do_early_param(char *param, char *val, const struct obs_kernel_param *p; for (p = __setup_start; p < __setup_end; p++) { - if ((p->early && parameq(param, p->str)) || - (strcmp(param, "console") == 0 && - strcmp(p->str, "earlycon") == 0) - ) { + if (p->early && parameq(param, p->str)) { if (p->setup_func(val) != 0) pr_warn("Malformed early option '%s'\n", param); } diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index 7cb44f9f3825..d27a64d58023 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -1156,6 +1156,17 @@ static unsigned int __init add_to_rb(struct printk_ringbuffer *rb, static char setup_text_buf[PRINTKRB_RECORD_MAX] __initdata; +static void print_log_buf_usage_stats(void) +{ + unsigned int descs_count = log_buf_len >> PRB_AVGBITS; + size_t meta_data_size; + + meta_data_size = descs_count * (sizeof(struct prb_desc) + sizeof(struct printk_info)); + + pr_info("log buffer data + meta data: %u + %zu = %zu bytes\n", + log_buf_len, meta_data_size, log_buf_len + meta_data_size); +} + void __init setup_log_buf(int early) { struct printk_info *new_infos; @@ -1185,20 +1196,25 @@ void __init setup_log_buf(int early) if (!early && !new_log_buf_len) log_buf_add_cpu(); - if (!new_log_buf_len) + if (!new_log_buf_len) { + /* Show the memory stats only once. */ + if (!early) + goto out; + return; + } new_descs_count = new_log_buf_len >> PRB_AVGBITS; if (new_descs_count == 0) { pr_err("new_log_buf_len: %lu too small\n", new_log_buf_len); - return; + goto out; } new_log_buf = memblock_alloc(new_log_buf_len, LOG_ALIGN); if (unlikely(!new_log_buf)) { pr_err("log_buf_len: %lu text bytes not available\n", new_log_buf_len); - return; + goto out; } new_descs_size = new_descs_count * sizeof(struct prb_desc); @@ -1261,7 +1277,7 @@ void __init setup_log_buf(int early) prb_next_seq(&printk_rb_static) - seq); } - pr_info("log_buf_len: %u bytes\n", log_buf_len); + print_log_buf_usage_stats(); pr_info("early log buf free: %u(%u%%)\n", free, (free * 100) / __LOG_BUF_LEN); return; @@ -1270,6 +1286,8 @@ err_free_descs: memblock_free(new_descs, new_descs_size); err_free_log_buf: memblock_free(new_log_buf, new_log_buf_len); +out: + print_log_buf_usage_stats(); } static bool __read_mostly ignore_loglevel; |