CONSOLE_LOGLEVEL_DEFAULT is nothing more than a shorthand of CONFIG_CONSOLE_LOGLEVEL_DEFAULT.
When you change CONFIG_CONSOLE_LOGLEVEL_DEFAULT from Kconfig, almost all objects are rebuilt because CONFIG_CONSOLE_LOGLEVEL_DEFAULT is used in <linux/printk.h>, which is included from most of source files.
In fact, there are only 4 users of CONSOLE_LOGLEVEL_DEFAULT:
arch/x86/platform/uv/uv_nmi.c drivers/firmware/efi/libstub/efi-stub-helper.c drivers/tty/sysrq.c kernel/printk/printk.c
So, when you change CONFIG_CONSOLE_LOGLEVEL_DEFAULT and rebuild the kernel, it is enough to recompile those 4 files.
Remove the CONSOLE_LOGLEVEL_DEFAULT definition from <linux/printk.h>, and use CONFIG_CONSOLE_LOGLEVEL_DEFAULT directly.
With this, the build system will rebuild the minimal number of objects.
Steps to confirm it:
[1] Do the full build [2] Change CONFIG_CONSOLE_LOGLEVEL_DEFAULT from 'make menuconfig' etc. [3] Rebuild
$ make SYNC include/config/auto.conf CALL scripts/checksyscalls.sh CALL scripts/atomic/check-atomics.sh DESCEND objtool CHK include/generated/compile.h CC kernel/printk/printk.o AR kernel/printk/built-in.a AR kernel/built-in.a CC drivers/tty/sysrq.o AR drivers/tty/built-in.a CC drivers/firmware/efi/libstub/efi-stub-helper.o STUBCPY drivers/firmware/efi/libstub/efi-stub-helper.stub.o AR drivers/firmware/efi/libstub/lib.a AR drivers/built-in.a GEN .version CHK include/generated/compile.h UPD include/generated/compile.h CC init/version.o AR init/built-in.a LD vmlinux.o ...
For the same reason, do likewise for CONSOLE_LOGLEVEL_QUIET and MESSAGE_LOGLEVEL_DEFAULT.
Signed-off-by: Masahiro Yamada masahiroy@kernel.org ---
arch/x86/platform/uv/uv_nmi.c | 2 +- drivers/firmware/efi/libstub/efi-stub-helper.c | 6 +++--- drivers/tty/sysrq.c | 4 ++-- drivers/video/fbdev/core/fbcon.c | 2 +- drivers/video/fbdev/efifb.c | 2 +- include/linux/printk.h | 10 ---------- init/main.c | 2 +- kernel/printk/printk.c | 6 +++--- 8 files changed, 12 insertions(+), 22 deletions(-)
diff --git a/arch/x86/platform/uv/uv_nmi.c b/arch/x86/platform/uv/uv_nmi.c index eafc530c8767..4751299c7416 100644 --- a/arch/x86/platform/uv/uv_nmi.c +++ b/arch/x86/platform/uv/uv_nmi.c @@ -100,7 +100,7 @@ static cpumask_var_t uv_nmi_cpu_mask; * Default is all stack dumps go to the console and buffer. * Lower level to send to log buffer only. */ -static int uv_nmi_loglevel = CONSOLE_LOGLEVEL_DEFAULT; +static int uv_nmi_loglevel = CONFIG_CONSOLE_LOGLEVEL_DEFAULT; module_param_named(dump_loglevel, uv_nmi_loglevel, int, 0644);
/* diff --git a/drivers/firmware/efi/libstub/efi-stub-helper.c b/drivers/firmware/efi/libstub/efi-stub-helper.c index aa8da0a49829..3e8d8f706589 100644 --- a/drivers/firmware/efi/libstub/efi-stub-helper.c +++ b/drivers/firmware/efi/libstub/efi-stub-helper.c @@ -12,7 +12,7 @@ #include <linux/ctype.h> #include <linux/efi.h> #include <linux/kernel.h> -#include <linux/printk.h> /* For CONSOLE_LOGLEVEL_* */ +#include <linux/printk.h> /* For CONSOLE_LOGLEVEL_DEBUG */ #include <asm/efi.h> #include <asm/setup.h>
@@ -21,7 +21,7 @@ bool efi_nochunk; bool efi_nokaslr = !IS_ENABLED(CONFIG_RANDOMIZE_BASE); bool efi_noinitrd; -int efi_loglevel = CONSOLE_LOGLEVEL_DEFAULT; +int efi_loglevel = CONFIG_CONSOLE_LOGLEVEL_DEFAULT; bool efi_novamap;
static bool efi_nosoftreserve; @@ -213,7 +213,7 @@ efi_status_t efi_parse_options(char const *cmdline) if (!strcmp(param, "nokaslr")) { efi_nokaslr = true; } else if (!strcmp(param, "quiet")) { - efi_loglevel = CONSOLE_LOGLEVEL_QUIET; + efi_loglevel = CONFIG_CONSOLE_LOGLEVEL_QUIET; } else if (!strcmp(param, "noinitrd")) { efi_noinitrd = true; } else if (!strcmp(param, "efi") && val) { diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c index 959f9e121cc6..e0ae7793155e 100644 --- a/drivers/tty/sysrq.c +++ b/drivers/tty/sysrq.c @@ -103,7 +103,7 @@ static void sysrq_handle_loglevel(int key) int i;
i = key - '0'; - console_loglevel = CONSOLE_LOGLEVEL_DEFAULT; + console_loglevel = CONFIG_CONSOLE_LOGLEVEL_DEFAULT; pr_info("Loglevel set to %d\n", i); console_loglevel = i; } @@ -584,7 +584,7 @@ void __handle_sysrq(int key, bool check_mask) * routing in the consumers of /proc/kmsg. */ orig_log_level = console_loglevel; - console_loglevel = CONSOLE_LOGLEVEL_DEFAULT; + console_loglevel = CONFIG_CONSOLE_LOGLEVEL_DEFAULT;
op_p = __sysrq_get_key_op(key); if (op_p) { diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c index bf61598bf1c3..75b97268663f 100644 --- a/drivers/video/fbdev/core/fbcon.c +++ b/drivers/video/fbdev/core/fbcon.c @@ -1043,7 +1043,7 @@ static void fbcon_init(struct vc_data *vc, int init)
info = registered_fb[con2fb_map[vc->vc_num]];
- if (logo_shown < 0 && console_loglevel <= CONSOLE_LOGLEVEL_QUIET) + if (logo_shown < 0 && console_loglevel <= CONFIG_CONSOLE_LOGLEVEL_QUIET) logo_shown = FBCON_LOGO_DONTSHOW;
if (vc != svc || logo_shown == FBCON_LOGO_DONTSHOW || diff --git a/drivers/video/fbdev/efifb.c b/drivers/video/fbdev/efifb.c index e57c00824965..dfb234a0a59d 100644 --- a/drivers/video/fbdev/efifb.c +++ b/drivers/video/fbdev/efifb.c @@ -160,7 +160,7 @@ static void efifb_show_boot_graphics(struct fb_info *info) }
/* Avoid flashing the logo if we're going to print std probe messages */ - if (console_loglevel > CONSOLE_LOGLEVEL_QUIET) + if (console_loglevel > CONFIG_CONSOLE_LOGLEVEL_QUIET) return;
/* bgrt_tab.status is unreliable, so we don't check it */ diff --git a/include/linux/printk.h b/include/linux/printk.h index fe7eb2351610..fd34b3aa2f90 100644 --- a/include/linux/printk.h +++ b/include/linux/printk.h @@ -46,22 +46,12 @@ static inline const char *printk_skip_headers(const char *buffer)
#define CONSOLE_EXT_LOG_MAX 8192
-/* printk's without a loglevel use this.. */ -#define MESSAGE_LOGLEVEL_DEFAULT CONFIG_MESSAGE_LOGLEVEL_DEFAULT - /* We show everything that is MORE important than this.. */ #define CONSOLE_LOGLEVEL_SILENT 0 /* Mum's the word */ #define CONSOLE_LOGLEVEL_MIN 1 /* Minimum loglevel we let people use */ #define CONSOLE_LOGLEVEL_DEBUG 10 /* issue debug messages */ #define CONSOLE_LOGLEVEL_MOTORMOUTH 15 /* You can't shut this one up */
-/* - * Default used to be hard-coded at 7, quiet used to be hardcoded at 4, - * we're now allowing both to be set from kernel config. - */ -#define CONSOLE_LOGLEVEL_DEFAULT CONFIG_CONSOLE_LOGLEVEL_DEFAULT -#define CONSOLE_LOGLEVEL_QUIET CONFIG_CONSOLE_LOGLEVEL_QUIET - extern int console_printk[];
#define console_loglevel (console_printk[0]) diff --git a/init/main.c b/init/main.c index c68d784376ca..4dfcbf7f24c6 100644 --- a/init/main.c +++ b/init/main.c @@ -236,7 +236,7 @@ static int __init debug_kernel(char *str)
static int __init quiet_kernel(char *str) { - console_loglevel = CONSOLE_LOGLEVEL_QUIET; + console_loglevel = CONFIG_CONSOLE_LOGLEVEL_QUIET; return 0; }
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index 5a95c688621f..92b93340905c 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -61,10 +61,10 @@ #include "internal.h"
int console_printk[4] = { - CONSOLE_LOGLEVEL_DEFAULT, /* console_loglevel */ - MESSAGE_LOGLEVEL_DEFAULT, /* default_message_loglevel */ + CONFIG_CONSOLE_LOGLEVEL_DEFAULT, /* console_loglevel */ + CONFIG_MESSAGE_LOGLEVEL_DEFAULT, /* default_message_loglevel */ CONSOLE_LOGLEVEL_MIN, /* minimum_console_loglevel */ - CONSOLE_LOGLEVEL_DEFAULT, /* default_console_loglevel */ + CONFIG_CONSOLE_LOGLEVEL_DEFAULT, /* default_console_loglevel */ }; EXPORT_SYMBOL_GPL(console_printk);