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* [PATCH 0/3] init/Kconfig: generalize config COMMAND_LINE_SIZE
@ 2026-08-06  6:05 Wilson Felipe Pereira
  2026-08-06  6:05 ` [PATCH 2/3] arch: use CONFIG_COMMAND_LINE_SIZE across all architectures Wilson Felipe Pereira
  0 siblings, 1 reply; 3+ messages in thread
From: Wilson Felipe Pereira @ 2026-08-06  6:05 UTC (permalink / raw)
  To: Arnd Bergmann, Andrew Morton
  Cc: Yosry Ahmed, Wilson Felipe Pereira, Paul Walmsley, Palmer Dabbelt,
	Albert Ou, Alexandre Ghiti, linux-riscv

This patch series promotes COMMAND_LINE_SIZE from arch/s390/Kconfig to
init/Kconfig to be generally available to other architectures.

In some use cases, such as netboot kernels, rootfs configurations, larger
initramfs setups, require larger sizes. While for embedded workloads, it
can be reduced to save memory.

Since COMMAND_LINE_SIZE can be larger, it also makes sense to allow
INIT_ENV_ARG_LIMIT to be configured.

Wilson Felipe Pereira (3):
  init/Kconfig: generalize config COMMAND_LINE_SIZE to all architectures
  arch: use CONFIG_COMMAND_LINE_SIZE across all architectures
  init/Kconfig: make config INIT_ENV_ARG_LIMIT user-configurable

 arch/alpha/include/uapi/asm/setup.h      |  4 ++++
 arch/arc/include/asm/setup.h             |  2 +-
 arch/arm/include/uapi/asm/setup.h        |  6 +++++-
 arch/arm64/include/uapi/asm/setup.h      |  4 ++++
 arch/loongarch/include/uapi/asm/setup.h  |  4 ++++
 arch/m68k/include/uapi/asm/setup.h       |  6 +++++-
 arch/microblaze/include/uapi/asm/setup.h |  4 ++++
 arch/mips/include/uapi/asm/setup.h       |  4 ++++
 arch/parisc/include/uapi/asm/setup.h     |  4 ++++
 arch/powerpc/include/uapi/asm/setup.h    |  4 ++++
 arch/riscv/include/uapi/asm/setup.h      |  4 ++++
 arch/s390/Kconfig                        |  8 --------
 arch/sparc/include/uapi/asm/setup.h      | 10 +++++++---
 arch/um/include/asm/setup.h              |  2 +-
 arch/x86/include/asm/setup.h             |  2 +-
 arch/xtensa/include/uapi/asm/setup.h     |  4 ++++
 include/uapi/asm-generic/setup.h         |  4 ++++
 init/Kconfig                             | 15 ++++++++++++++-
 18 files changed, 74 insertions(+), 17 deletions(-)

--
2.55.0.654.g21b8a5bc05-goog

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^ permalink raw reply	[flat|nested] 3+ messages in thread
* [PATCH 2/3] arch: use CONFIG_COMMAND_LINE_SIZE across all architectures
  2026-08-06  6:05 [PATCH 0/3] init/Kconfig: generalize config COMMAND_LINE_SIZE Wilson Felipe Pereira
@ 2026-08-06  6:05 ` Wilson Felipe Pereira
  0 siblings, 0 replies; 3+ messages in thread
From: Wilson Felipe Pereira @ 2026-08-06  6:05 UTC (permalink / raw)
  To: Arnd Bergmann, Andrew Morton
  Cc: Yosry Ahmed, Wilson Felipe Pereira, Maciej Żenczykowski,
	Paul Walmsley, Palmer Dabbelt, Albert Ou, Alexandre Ghiti,
	linux-riscv, linux-arch

Now that CONFIG_COMMAND_LINE_SIZE is available in init/Kconfig for all
architectures, update every architecture's setup.h header to define
COMMAND_LINE_SIZE as CONFIG_COMMAND_LINE_SIZE.

For user-space API (uapi) headers, wrap the definition in an
`#ifdef __KERNEL__` guard and retain the historical hardcoded default in
the `#else` block. When user-space headers are installed via
`make headers_install`, unifdef strips out the kernel section, ensuring
same value as before for user-space applications including `<asm/setup.h>`.

Originally-by: Maciej Żenczykowski <maze@google.com>
Signed-off-by: Wilson Felipe Pereira <wfelipe@google.com>
---
 arch/alpha/include/uapi/asm/setup.h      |  4 ++++
 arch/arc/include/asm/setup.h             |  2 +-
 arch/arm/include/uapi/asm/setup.h        |  6 +++++-
 arch/arm64/include/uapi/asm/setup.h      |  4 ++++
 arch/loongarch/include/uapi/asm/setup.h  |  4 ++++
 arch/m68k/include/uapi/asm/setup.h       |  6 +++++-
 arch/microblaze/include/uapi/asm/setup.h |  4 ++++
 arch/mips/include/uapi/asm/setup.h       |  4 ++++
 arch/parisc/include/uapi/asm/setup.h     |  4 ++++
 arch/powerpc/include/uapi/asm/setup.h    |  4 ++++
 arch/riscv/include/uapi/asm/setup.h      |  4 ++++
 arch/sparc/include/uapi/asm/setup.h      | 10 +++++++---
 arch/um/include/asm/setup.h              |  2 +-
 arch/x86/include/asm/setup.h             |  2 +-
 arch/xtensa/include/uapi/asm/setup.h     |  4 ++++
 include/uapi/asm-generic/setup.h         |  4 ++++
 16 files changed, 60 insertions(+), 8 deletions(-)

diff --git a/arch/alpha/include/uapi/asm/setup.h b/arch/alpha/include/uapi/asm/setup.h
index f881ea5947cbc..169f743ef7658 100644
--- a/arch/alpha/include/uapi/asm/setup.h
+++ b/arch/alpha/include/uapi/asm/setup.h
@@ -2,6 +2,10 @@
 #ifndef _UAPI__ALPHA_SETUP_H
 #define _UAPI__ALPHA_SETUP_H
 
+#ifdef __KERNEL__
+#define COMMAND_LINE_SIZE	CONFIG_COMMAND_LINE_SIZE
+#else
 #define COMMAND_LINE_SIZE	256
+#endif
 
 #endif /* _UAPI__ALPHA_SETUP_H */
diff --git a/arch/arc/include/asm/setup.h b/arch/arc/include/asm/setup.h
index 1c6db599e1fcc..60e158d58cec7 100644
--- a/arch/arc/include/asm/setup.h
+++ b/arch/arc/include/asm/setup.h
@@ -9,7 +9,7 @@
 #include <linux/types.h>
 #include <uapi/asm/setup.h>
 
-#define COMMAND_LINE_SIZE 256
+#define COMMAND_LINE_SIZE CONFIG_COMMAND_LINE_SIZE
 
 /*
  * Data structure to map a ID to string
diff --git a/arch/arm/include/uapi/asm/setup.h b/arch/arm/include/uapi/asm/setup.h
index 8e50e034fec73..4aa93558af1e7 100644
--- a/arch/arm/include/uapi/asm/setup.h
+++ b/arch/arm/include/uapi/asm/setup.h
@@ -17,7 +17,11 @@
 
 #include <linux/types.h>
 
-#define COMMAND_LINE_SIZE 1024
+#ifdef __KERNEL__
+#define COMMAND_LINE_SIZE	CONFIG_COMMAND_LINE_SIZE
+#else
+#define COMMAND_LINE_SIZE	1024
+#endif
 
 /* The list ends with an ATAG_NONE node. */
 #define ATAG_NONE	0x00000000
diff --git a/arch/arm64/include/uapi/asm/setup.h b/arch/arm64/include/uapi/asm/setup.h
index 5d703888f3511..2236890175a5a 100644
--- a/arch/arm64/include/uapi/asm/setup.h
+++ b/arch/arm64/include/uapi/asm/setup.h
@@ -22,6 +22,10 @@
 
 #include <linux/types.h>
 
+#ifdef __KERNEL__
+#define COMMAND_LINE_SIZE	CONFIG_COMMAND_LINE_SIZE
+#else
 #define COMMAND_LINE_SIZE	2048
+#endif
 
 #endif
diff --git a/arch/loongarch/include/uapi/asm/setup.h b/arch/loongarch/include/uapi/asm/setup.h
index d46363ce3e024..03c7bfa1e5d9f 100644
--- a/arch/loongarch/include/uapi/asm/setup.h
+++ b/arch/loongarch/include/uapi/asm/setup.h
@@ -3,6 +3,10 @@
 #ifndef _UAPI_ASM_LOONGARCH_SETUP_H
 #define _UAPI_ASM_LOONGARCH_SETUP_H
 
+#ifdef __KERNEL__
+#define COMMAND_LINE_SIZE	CONFIG_COMMAND_LINE_SIZE
+#else
 #define COMMAND_LINE_SIZE	4096
+#endif
 
 #endif /* _UAPI_ASM_LOONGARCH_SETUP_H */
diff --git a/arch/m68k/include/uapi/asm/setup.h b/arch/m68k/include/uapi/asm/setup.h
index 25fe26d5597cc..2d5b24a5345f9 100644
--- a/arch/m68k/include/uapi/asm/setup.h
+++ b/arch/m68k/include/uapi/asm/setup.h
@@ -12,6 +12,10 @@
 #ifndef _UAPI_M68K_SETUP_H
 #define _UAPI_M68K_SETUP_H
 
-#define COMMAND_LINE_SIZE 256
+#ifdef __KERNEL__
+#define COMMAND_LINE_SIZE	CONFIG_COMMAND_LINE_SIZE
+#else
+#define COMMAND_LINE_SIZE	256
+#endif
 
 #endif /* _UAPI_M68K_SETUP_H */
diff --git a/arch/microblaze/include/uapi/asm/setup.h b/arch/microblaze/include/uapi/asm/setup.h
index 16c56807f86a2..e4b253064c7d9 100644
--- a/arch/microblaze/include/uapi/asm/setup.h
+++ b/arch/microblaze/include/uapi/asm/setup.h
@@ -12,6 +12,10 @@
 #ifndef _UAPI_ASM_MICROBLAZE_SETUP_H
 #define _UAPI_ASM_MICROBLAZE_SETUP_H
 
+#ifdef __KERNEL__
+#define COMMAND_LINE_SIZE	CONFIG_COMMAND_LINE_SIZE
+#else
 #define COMMAND_LINE_SIZE	256
+#endif
 
 #endif /* _UAPI_ASM_MICROBLAZE_SETUP_H */
diff --git a/arch/mips/include/uapi/asm/setup.h b/arch/mips/include/uapi/asm/setup.h
index 7d48c433b0c27..8d6c474835aec 100644
--- a/arch/mips/include/uapi/asm/setup.h
+++ b/arch/mips/include/uapi/asm/setup.h
@@ -2,7 +2,11 @@
 #ifndef _UAPI_MIPS_SETUP_H
 #define _UAPI_MIPS_SETUP_H
 
+#ifdef __KERNEL__
+#define COMMAND_LINE_SIZE	CONFIG_COMMAND_LINE_SIZE
+#else
 #define COMMAND_LINE_SIZE	4096
+#endif
 
 
 #endif /* _UAPI_MIPS_SETUP_H */
diff --git a/arch/parisc/include/uapi/asm/setup.h b/arch/parisc/include/uapi/asm/setup.h
index 78b2f4ec7d652..cfa77e84205dc 100644
--- a/arch/parisc/include/uapi/asm/setup.h
+++ b/arch/parisc/include/uapi/asm/setup.h
@@ -2,6 +2,10 @@
 #ifndef _PARISC_SETUP_H
 #define _PARISC_SETUP_H
 
+#ifdef __KERNEL__
+#define COMMAND_LINE_SIZE	CONFIG_COMMAND_LINE_SIZE
+#else
 #define COMMAND_LINE_SIZE	1024
+#endif
 
 #endif /* _PARISC_SETUP_H */
diff --git a/arch/powerpc/include/uapi/asm/setup.h b/arch/powerpc/include/uapi/asm/setup.h
index c54940b09d065..daa15ac4e94c6 100644
--- a/arch/powerpc/include/uapi/asm/setup.h
+++ b/arch/powerpc/include/uapi/asm/setup.h
@@ -2,6 +2,10 @@
 #ifndef _UAPI_ASM_POWERPC_SETUP_H
 #define _UAPI_ASM_POWERPC_SETUP_H
 
+#ifdef __KERNEL__
+#define COMMAND_LINE_SIZE	CONFIG_COMMAND_LINE_SIZE
+#else
 #define COMMAND_LINE_SIZE	2048
+#endif
 
 #endif /* _UAPI_ASM_POWERPC_SETUP_H */
diff --git a/arch/riscv/include/uapi/asm/setup.h b/arch/riscv/include/uapi/asm/setup.h
index eb4f0209c6960..a6c1f4b0987e3 100644
--- a/arch/riscv/include/uapi/asm/setup.h
+++ b/arch/riscv/include/uapi/asm/setup.h
@@ -3,6 +3,10 @@
 #ifndef _UAPI_ASM_RISCV_SETUP_H
 #define _UAPI_ASM_RISCV_SETUP_H
 
+#ifdef __KERNEL__
+#define COMMAND_LINE_SIZE	CONFIG_COMMAND_LINE_SIZE
+#else
 #define COMMAND_LINE_SIZE	2048
+#endif
 
 #endif /* _UAPI_ASM_RISCV_SETUP_H */
diff --git a/arch/sparc/include/uapi/asm/setup.h b/arch/sparc/include/uapi/asm/setup.h
index 3c208a4dd4640..7054f5249a3a6 100644
--- a/arch/sparc/include/uapi/asm/setup.h
+++ b/arch/sparc/include/uapi/asm/setup.h
@@ -6,10 +6,14 @@
 #ifndef _UAPI_SPARC_SETUP_H
 #define _UAPI_SPARC_SETUP_H
 
-#if defined(__sparc__) && defined(__arch64__)
-# define COMMAND_LINE_SIZE 2048
+#ifdef __KERNEL__
+# define COMMAND_LINE_SIZE CONFIG_COMMAND_LINE_SIZE
 #else
-# define COMMAND_LINE_SIZE 256
+# if defined(__sparc__) && defined(__arch64__)
+#  define COMMAND_LINE_SIZE 2048
+# else
+#  define COMMAND_LINE_SIZE 256
+# endif
 #endif
 
 
diff --git a/arch/um/include/asm/setup.h b/arch/um/include/asm/setup.h
index 80ada899f2542..bc83dc4d467d3 100644
--- a/arch/um/include/asm/setup.h
+++ b/arch/um/include/asm/setup.h
@@ -6,6 +6,6 @@
  * command line, so this choice is ok.
  */
 
-#define COMMAND_LINE_SIZE 4096
+#define COMMAND_LINE_SIZE CONFIG_COMMAND_LINE_SIZE
 
 #endif		/* SETUP_H_INCLUDED */
diff --git a/arch/x86/include/asm/setup.h b/arch/x86/include/asm/setup.h
index 914eb32581c73..b73caf64f2199 100644
--- a/arch/x86/include/asm/setup.h
+++ b/arch/x86/include/asm/setup.h
@@ -4,7 +4,7 @@
 
 #include <uapi/asm/setup.h>
 
-#define COMMAND_LINE_SIZE 2048
+#define COMMAND_LINE_SIZE CONFIG_COMMAND_LINE_SIZE
 
 #include <linux/linkage.h>
 #include <asm/page_types.h>
diff --git a/arch/xtensa/include/uapi/asm/setup.h b/arch/xtensa/include/uapi/asm/setup.h
index 5356a5fd4d173..dcf33a403527a 100644
--- a/arch/xtensa/include/uapi/asm/setup.h
+++ b/arch/xtensa/include/uapi/asm/setup.h
@@ -12,6 +12,10 @@
 #ifndef _XTENSA_SETUP_H
 #define _XTENSA_SETUP_H
 
+#ifdef __KERNEL__
+#define COMMAND_LINE_SIZE	CONFIG_COMMAND_LINE_SIZE
+#else
 #define COMMAND_LINE_SIZE	256
+#endif
 
 #endif
diff --git a/include/uapi/asm-generic/setup.h b/include/uapi/asm-generic/setup.h
index 88ac5100df359..b8d06e6d56bd7 100644
--- a/include/uapi/asm-generic/setup.h
+++ b/include/uapi/asm-generic/setup.h
@@ -2,6 +2,10 @@
 #ifndef __ASM_GENERIC_SETUP_H
 #define __ASM_GENERIC_SETUP_H
 
+#ifdef __KERNEL__
+#define COMMAND_LINE_SIZE	CONFIG_COMMAND_LINE_SIZE
+#else
 #define COMMAND_LINE_SIZE	512
+#endif
 
 #endif	/* __ASM_GENERIC_SETUP_H */
-- 
2.55.0.654.g21b8a5bc05-goog


_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv

^ permalink raw reply related	[flat|nested] 3+ messages in thread
* [PATCH 2/3] arch: use CONFIG_COMMAND_LINE_SIZE across all architectures
  2026-08-06  6:14 [PATCH 0/3] init/Kconfig: generalize config COMMAND_LINE_SIZE Wilson Felipe Pereira
@ 2026-08-06  6:14 ` Wilson Felipe Pereira
  0 siblings, 0 replies; 3+ messages in thread
From: Wilson Felipe Pereira @ 2026-08-06  6:14 UTC (permalink / raw)
  To: Arnd Bergmann, Andrew Morton
  Cc: Paul Walmsley, Palmer Dabbelt, Albert Ou, Alexandre Ghiti,
	Heiko Carstens, Vasily Gorbik, Alexander Gordeev,
	Christian Borntraeger, Sven Schnelle, linux-arch, linux-riscv,
	linux-s390, Wilson Felipe Pereira, Maciej Żenczykowski

Now that CONFIG_COMMAND_LINE_SIZE is available in init/Kconfig for all
architectures, update every architecture's setup.h header to define
COMMAND_LINE_SIZE as CONFIG_COMMAND_LINE_SIZE.

For user-space API (uapi) headers, wrap the definition in an
`#ifdef __KERNEL__` guard and retain the historical hardcoded default in
the `#else` block. When user-space headers are installed via
`make headers_install`, unifdef strips out the kernel section, ensuring
same value as before for user-space applications including `<asm/setup.h>`.

Originally-by: Maciej Żenczykowski <maze@google.com>
Signed-off-by: Wilson Felipe Pereira <wfelipe@google.com>
---
 arch/alpha/include/uapi/asm/setup.h      |  4 ++++
 arch/arc/include/asm/setup.h             |  2 +-
 arch/arm/include/uapi/asm/setup.h        |  6 +++++-
 arch/arm64/include/uapi/asm/setup.h      |  4 ++++
 arch/loongarch/include/uapi/asm/setup.h  |  4 ++++
 arch/m68k/include/uapi/asm/setup.h       |  6 +++++-
 arch/microblaze/include/uapi/asm/setup.h |  4 ++++
 arch/mips/include/uapi/asm/setup.h       |  4 ++++
 arch/parisc/include/uapi/asm/setup.h     |  4 ++++
 arch/powerpc/include/uapi/asm/setup.h    |  4 ++++
 arch/riscv/include/uapi/asm/setup.h      |  4 ++++
 arch/sparc/include/uapi/asm/setup.h      | 10 +++++++---
 arch/um/include/asm/setup.h              |  2 +-
 arch/x86/include/asm/setup.h             |  2 +-
 arch/xtensa/include/uapi/asm/setup.h     |  4 ++++
 include/uapi/asm-generic/setup.h         |  4 ++++
 16 files changed, 60 insertions(+), 8 deletions(-)

diff --git a/arch/alpha/include/uapi/asm/setup.h b/arch/alpha/include/uapi/asm/setup.h
index f881ea5947cbc..169f743ef7658 100644
--- a/arch/alpha/include/uapi/asm/setup.h
+++ b/arch/alpha/include/uapi/asm/setup.h
@@ -2,6 +2,10 @@
 #ifndef _UAPI__ALPHA_SETUP_H
 #define _UAPI__ALPHA_SETUP_H
 
+#ifdef __KERNEL__
+#define COMMAND_LINE_SIZE	CONFIG_COMMAND_LINE_SIZE
+#else
 #define COMMAND_LINE_SIZE	256
+#endif
 
 #endif /* _UAPI__ALPHA_SETUP_H */
diff --git a/arch/arc/include/asm/setup.h b/arch/arc/include/asm/setup.h
index 1c6db599e1fcc..60e158d58cec7 100644
--- a/arch/arc/include/asm/setup.h
+++ b/arch/arc/include/asm/setup.h
@@ -9,7 +9,7 @@
 #include <linux/types.h>
 #include <uapi/asm/setup.h>
 
-#define COMMAND_LINE_SIZE 256
+#define COMMAND_LINE_SIZE CONFIG_COMMAND_LINE_SIZE
 
 /*
  * Data structure to map a ID to string
diff --git a/arch/arm/include/uapi/asm/setup.h b/arch/arm/include/uapi/asm/setup.h
index 8e50e034fec73..4aa93558af1e7 100644
--- a/arch/arm/include/uapi/asm/setup.h
+++ b/arch/arm/include/uapi/asm/setup.h
@@ -17,7 +17,11 @@
 
 #include <linux/types.h>
 
-#define COMMAND_LINE_SIZE 1024
+#ifdef __KERNEL__
+#define COMMAND_LINE_SIZE	CONFIG_COMMAND_LINE_SIZE
+#else
+#define COMMAND_LINE_SIZE	1024
+#endif
 
 /* The list ends with an ATAG_NONE node. */
 #define ATAG_NONE	0x00000000
diff --git a/arch/arm64/include/uapi/asm/setup.h b/arch/arm64/include/uapi/asm/setup.h
index 5d703888f3511..2236890175a5a 100644
--- a/arch/arm64/include/uapi/asm/setup.h
+++ b/arch/arm64/include/uapi/asm/setup.h
@@ -22,6 +22,10 @@
 
 #include <linux/types.h>
 
+#ifdef __KERNEL__
+#define COMMAND_LINE_SIZE	CONFIG_COMMAND_LINE_SIZE
+#else
 #define COMMAND_LINE_SIZE	2048
+#endif
 
 #endif
diff --git a/arch/loongarch/include/uapi/asm/setup.h b/arch/loongarch/include/uapi/asm/setup.h
index d46363ce3e024..03c7bfa1e5d9f 100644
--- a/arch/loongarch/include/uapi/asm/setup.h
+++ b/arch/loongarch/include/uapi/asm/setup.h
@@ -3,6 +3,10 @@
 #ifndef _UAPI_ASM_LOONGARCH_SETUP_H
 #define _UAPI_ASM_LOONGARCH_SETUP_H
 
+#ifdef __KERNEL__
+#define COMMAND_LINE_SIZE	CONFIG_COMMAND_LINE_SIZE
+#else
 #define COMMAND_LINE_SIZE	4096
+#endif
 
 #endif /* _UAPI_ASM_LOONGARCH_SETUP_H */
diff --git a/arch/m68k/include/uapi/asm/setup.h b/arch/m68k/include/uapi/asm/setup.h
index 25fe26d5597cc..2d5b24a5345f9 100644
--- a/arch/m68k/include/uapi/asm/setup.h
+++ b/arch/m68k/include/uapi/asm/setup.h
@@ -12,6 +12,10 @@
 #ifndef _UAPI_M68K_SETUP_H
 #define _UAPI_M68K_SETUP_H
 
-#define COMMAND_LINE_SIZE 256
+#ifdef __KERNEL__
+#define COMMAND_LINE_SIZE	CONFIG_COMMAND_LINE_SIZE
+#else
+#define COMMAND_LINE_SIZE	256
+#endif
 
 #endif /* _UAPI_M68K_SETUP_H */
diff --git a/arch/microblaze/include/uapi/asm/setup.h b/arch/microblaze/include/uapi/asm/setup.h
index 16c56807f86a2..e4b253064c7d9 100644
--- a/arch/microblaze/include/uapi/asm/setup.h
+++ b/arch/microblaze/include/uapi/asm/setup.h
@@ -12,6 +12,10 @@
 #ifndef _UAPI_ASM_MICROBLAZE_SETUP_H
 #define _UAPI_ASM_MICROBLAZE_SETUP_H
 
+#ifdef __KERNEL__
+#define COMMAND_LINE_SIZE	CONFIG_COMMAND_LINE_SIZE
+#else
 #define COMMAND_LINE_SIZE	256
+#endif
 
 #endif /* _UAPI_ASM_MICROBLAZE_SETUP_H */
diff --git a/arch/mips/include/uapi/asm/setup.h b/arch/mips/include/uapi/asm/setup.h
index 7d48c433b0c27..8d6c474835aec 100644
--- a/arch/mips/include/uapi/asm/setup.h
+++ b/arch/mips/include/uapi/asm/setup.h
@@ -2,7 +2,11 @@
 #ifndef _UAPI_MIPS_SETUP_H
 #define _UAPI_MIPS_SETUP_H
 
+#ifdef __KERNEL__
+#define COMMAND_LINE_SIZE	CONFIG_COMMAND_LINE_SIZE
+#else
 #define COMMAND_LINE_SIZE	4096
+#endif
 
 
 #endif /* _UAPI_MIPS_SETUP_H */
diff --git a/arch/parisc/include/uapi/asm/setup.h b/arch/parisc/include/uapi/asm/setup.h
index 78b2f4ec7d652..cfa77e84205dc 100644
--- a/arch/parisc/include/uapi/asm/setup.h
+++ b/arch/parisc/include/uapi/asm/setup.h
@@ -2,6 +2,10 @@
 #ifndef _PARISC_SETUP_H
 #define _PARISC_SETUP_H
 
+#ifdef __KERNEL__
+#define COMMAND_LINE_SIZE	CONFIG_COMMAND_LINE_SIZE
+#else
 #define COMMAND_LINE_SIZE	1024
+#endif
 
 #endif /* _PARISC_SETUP_H */
diff --git a/arch/powerpc/include/uapi/asm/setup.h b/arch/powerpc/include/uapi/asm/setup.h
index c54940b09d065..daa15ac4e94c6 100644
--- a/arch/powerpc/include/uapi/asm/setup.h
+++ b/arch/powerpc/include/uapi/asm/setup.h
@@ -2,6 +2,10 @@
 #ifndef _UAPI_ASM_POWERPC_SETUP_H
 #define _UAPI_ASM_POWERPC_SETUP_H
 
+#ifdef __KERNEL__
+#define COMMAND_LINE_SIZE	CONFIG_COMMAND_LINE_SIZE
+#else
 #define COMMAND_LINE_SIZE	2048
+#endif
 
 #endif /* _UAPI_ASM_POWERPC_SETUP_H */
diff --git a/arch/riscv/include/uapi/asm/setup.h b/arch/riscv/include/uapi/asm/setup.h
index eb4f0209c6960..a6c1f4b0987e3 100644
--- a/arch/riscv/include/uapi/asm/setup.h
+++ b/arch/riscv/include/uapi/asm/setup.h
@@ -3,6 +3,10 @@
 #ifndef _UAPI_ASM_RISCV_SETUP_H
 #define _UAPI_ASM_RISCV_SETUP_H
 
+#ifdef __KERNEL__
+#define COMMAND_LINE_SIZE	CONFIG_COMMAND_LINE_SIZE
+#else
 #define COMMAND_LINE_SIZE	2048
+#endif
 
 #endif /* _UAPI_ASM_RISCV_SETUP_H */
diff --git a/arch/sparc/include/uapi/asm/setup.h b/arch/sparc/include/uapi/asm/setup.h
index 3c208a4dd4640..7054f5249a3a6 100644
--- a/arch/sparc/include/uapi/asm/setup.h
+++ b/arch/sparc/include/uapi/asm/setup.h
@@ -6,10 +6,14 @@
 #ifndef _UAPI_SPARC_SETUP_H
 #define _UAPI_SPARC_SETUP_H
 
-#if defined(__sparc__) && defined(__arch64__)
-# define COMMAND_LINE_SIZE 2048
+#ifdef __KERNEL__
+# define COMMAND_LINE_SIZE CONFIG_COMMAND_LINE_SIZE
 #else
-# define COMMAND_LINE_SIZE 256
+# if defined(__sparc__) && defined(__arch64__)
+#  define COMMAND_LINE_SIZE 2048
+# else
+#  define COMMAND_LINE_SIZE 256
+# endif
 #endif
 
 
diff --git a/arch/um/include/asm/setup.h b/arch/um/include/asm/setup.h
index 80ada899f2542..bc83dc4d467d3 100644
--- a/arch/um/include/asm/setup.h
+++ b/arch/um/include/asm/setup.h
@@ -6,6 +6,6 @@
  * command line, so this choice is ok.
  */
 
-#define COMMAND_LINE_SIZE 4096
+#define COMMAND_LINE_SIZE CONFIG_COMMAND_LINE_SIZE
 
 #endif		/* SETUP_H_INCLUDED */
diff --git a/arch/x86/include/asm/setup.h b/arch/x86/include/asm/setup.h
index 914eb32581c73..b73caf64f2199 100644
--- a/arch/x86/include/asm/setup.h
+++ b/arch/x86/include/asm/setup.h
@@ -4,7 +4,7 @@
 
 #include <uapi/asm/setup.h>
 
-#define COMMAND_LINE_SIZE 2048
+#define COMMAND_LINE_SIZE CONFIG_COMMAND_LINE_SIZE
 
 #include <linux/linkage.h>
 #include <asm/page_types.h>
diff --git a/arch/xtensa/include/uapi/asm/setup.h b/arch/xtensa/include/uapi/asm/setup.h
index 5356a5fd4d173..dcf33a403527a 100644
--- a/arch/xtensa/include/uapi/asm/setup.h
+++ b/arch/xtensa/include/uapi/asm/setup.h
@@ -12,6 +12,10 @@
 #ifndef _XTENSA_SETUP_H
 #define _XTENSA_SETUP_H
 
+#ifdef __KERNEL__
+#define COMMAND_LINE_SIZE	CONFIG_COMMAND_LINE_SIZE
+#else
 #define COMMAND_LINE_SIZE	256
+#endif
 
 #endif
diff --git a/include/uapi/asm-generic/setup.h b/include/uapi/asm-generic/setup.h
index 88ac5100df359..b8d06e6d56bd7 100644
--- a/include/uapi/asm-generic/setup.h
+++ b/include/uapi/asm-generic/setup.h
@@ -2,6 +2,10 @@
 #ifndef __ASM_GENERIC_SETUP_H
 #define __ASM_GENERIC_SETUP_H
 
+#ifdef __KERNEL__
+#define COMMAND_LINE_SIZE	CONFIG_COMMAND_LINE_SIZE
+#else
 #define COMMAND_LINE_SIZE	512
+#endif
 
 #endif	/* __ASM_GENERIC_SETUP_H */
-- 
2.55.0.654.g21b8a5bc05-goog


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