The patch titled Subject: Revert "console: don't prefer first registered if DT specifies stdout-path" has been added to the -mm tree. Its filename is revert-console-dont-prefer-first-registered-if-dt-specifies-stdout-path.patch This patch should soon appear at http://ozlabs.org/~akpm/mmots/broken-out/revert-console-dont-prefer-first-registered-if-dt-specifies-stdout-path.patch and later at http://ozlabs.org/~akpm/mmotm/broken-out/revert-console-dont-prefer-first-registered-if-dt-specifies-stdout-path.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Hans de Goede <hdegoede@xxxxxxxxxx> Subject: Revert "console: don't prefer first registered if DT specifies stdout-path" This reverts commit 05fd007e4629 ("console: don't prefer first registered if DT specifies stdout-path"). The reverted commit changes existing behavior on which many ARM boards rely. Many ARM small-board-computers, like e.g. the Raspberry Pi have both a video output and a serial console. Depending on whether the user is using the device as a more regular computer; or as a headless device we need to have the console on either one or the other. Many users rely on the kernel behavior of the console being present on both outputs, before the reverted commit the console setup with no console= kernel arguments on an ARM board which sets stdout-path in dt would look like this: [root@localhost ~]# cat /proc/consoles ttyS0 -W- (EC p a) 4:64 tty0 -WU (E p ) 4:1 Where as after the reverted commit, it looks like this: [root@localhost ~]# cat /proc/consoles ttyS0 -W- (EC p a) 4:64 This commit reverts commit 05fd007e4629 ("console: don't prefer first registered if DT specifies stdout-path") restoring the original behavior. Fixes: 05fd007e4629 ("console: don't prefer first registered if DT specifies stdout-path") Link: http://lkml.kernel.org/r/20161104121135.4780-2-hdegoede@xxxxxxxxxx Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx> Cc: Paul Burton <paul.burton@xxxxxxxxxx> Cc: Rob Herring <robh+dt@xxxxxxxxxx> Cc: Frank Rowand <frowand.list@xxxxxxxxx> Cc: Thorsten Leemhuis <regressions@xxxxxxxxxxxxx> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Cc: Tejun Heo <tj@xxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- drivers/of/base.c | 2 -- include/linux/console.h | 6 ------ kernel/printk/printk.c | 13 +------------ 3 files changed, 1 insertion(+), 20 deletions(-) diff -puN drivers/of/base.c~revert-console-dont-prefer-first-registered-if-dt-specifies-stdout-path drivers/of/base.c --- a/drivers/of/base.c~revert-console-dont-prefer-first-registered-if-dt-specifies-stdout-path +++ a/drivers/of/base.c @@ -2077,8 +2077,6 @@ void of_alias_scan(void * (*dt_alloc)(u6 name = of_get_property(of_aliases, "stdout", NULL); if (name) of_stdout = of_find_node_opts_by_path(name, &of_stdout_options); - if (of_stdout) - console_set_by_of(); } if (!of_aliases) diff -puN include/linux/console.h~revert-console-dont-prefer-first-registered-if-dt-specifies-stdout-path include/linux/console.h --- a/include/linux/console.h~revert-console-dont-prefer-first-registered-if-dt-specifies-stdout-path +++ a/include/linux/console.h @@ -173,12 +173,6 @@ static inline void console_sysfs_notify( #endif extern bool console_suspend_enabled; -#ifdef CONFIG_OF -extern void console_set_by_of(void); -#else -static inline void console_set_by_of(void) {} -#endif - /* Suspend and resume console messages over PM events */ extern void suspend_console(void); extern void resume_console(void); diff -puN kernel/printk/printk.c~revert-console-dont-prefer-first-registered-if-dt-specifies-stdout-path kernel/printk/printk.c --- a/kernel/printk/printk.c~revert-console-dont-prefer-first-registered-if-dt-specifies-stdout-path +++ a/kernel/printk/printk.c @@ -253,17 +253,6 @@ static int preferred_console = -1; int console_set_on_cmdline; EXPORT_SYMBOL(console_set_on_cmdline); -#ifdef CONFIG_OF -static bool of_specified_console; - -void console_set_by_of(void) -{ - of_specified_console = true; -} -#else -# define of_specified_console false -#endif - /* Flag: console code may call schedule() */ static int console_may_schedule; @@ -2657,7 +2646,7 @@ void register_console(struct console *ne * didn't select a console we take the first one * that registers here. */ - if (preferred_console < 0 && !of_specified_console) { + if (preferred_console < 0) { if (newcon->index < 0) newcon->index = 0; if (newcon->setup == NULL || _ Patches currently in -mm which might be from hdegoede@xxxxxxxxxx are revert-console-dont-prefer-first-registered-if-dt-specifies-stdout-path.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html