| From 94656c56d5704f1ce01262fbd96ebf1b15c11598 Mon Sep 17 00:00:00 2001 |
| From: Guenter Roeck <groeck@chromium.org> |
| Date: Mon, 5 Oct 2020 07:40:02 -0700 |
| Subject: [PATCH] CHROMIUM: Revert "printk: handle blank console arguments |
| passed in." |
| |
| This reverts commit 48021f98130880dd74286459a1ef48b5e9bc374f and |
| commit 3cffa06aeef7ece30f6b5ac0ea51f264e8fea4d0. |
| |
| The reverted patch "handles" blank "console=" command line parameters |
| by explicitly ignoring them. This is different to the previous behavior, |
| where such an argument disabled a default console (for example a |
| console specified via devicetree). |
| |
| Chrome OS uses the empty "console=" kernel command line parameter in |
| production images to explicitly disable the default console. With the |
| reverted patch in place, this no longer works. This has severe performance |
| impacts, especially in systems where the console is on a serial interface. |
| There may be other undesirable side effects - on at least one platform, |
| it was observed that dm-verity no longer works with the reverted patch |
| in place, for unknown reasons. |
| |
| BUG=chromium:1135157, b:172215283 |
| TEST=Verify that console is disabled in production images, and that dm-verity works |
| |
| Change-Id: I2c8d0d8c1ad9b93a6891292927f77e7616515511 |
| Disallow-Recycled-Builds: test-failures |
| Signed-off-by: Guenter Roeck <groeck@chromium.org> |
| Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/2449896 |
| Reviewed-by: Douglas Anderson <dianders@chromium.org> |
| Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org> |
| Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/2916548 |
| --- |
| kernel/printk/printk.c | 10 ---------- |
| 1 file changed, 10 deletions(-) |
| |
| diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c |
| index 054c0e7784fdfdcb1b3f11a67ccd82289eec810a..daa8f9f669291aa7ebd2af1ef273ecc155ed6054 100644 |
| --- a/kernel/printk/printk.c |
| +++ b/kernel/printk/printk.c |
| @@ -2504,16 +2504,6 @@ static int __init console_setup(char *str) |
| char *s; |
| int idx; |
| |
| - /* |
| - * console="" or console=null have been suggested as a way to |
| - * disable console output. Use ttynull that has been created |
| - * for exactly this purpose. |
| - */ |
| - if (str[0] == 0 || strcmp(str, "null") == 0) { |
| - __add_preferred_console("ttynull", 0, NULL, NULL, NULL, true); |
| - return 1; |
| - } |
| - |
| if (_braille_console_setup(&str, &brl_options)) |
| return 1; |
| |
| -- |
| 2.46.0.rc2.264.g509ed76dc8-goog |
| |
