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Subject[PATCH] Documentation: update kernel parameter limit notes
There does appear to be a limit on the number of parameters accepted by the
kernel at boot-time, so this changeset updates the kernel-parameters.rst
documentation to reflect that.

Signed-off-by: James Addison <>
Documentation/admin-guide/kernel-parameters.rst | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Documentation/admin-guide/kernel-parameters.rst
index 959f73a32..12cbf46b6 100644
--- a/Documentation/admin-guide/kernel-parameters.rst
+++ b/Documentation/admin-guide/kernel-parameters.rst
@@ -204,7 +204,8 @@ be entered as an environment variable, whereas its
absence indicates that
it will appear as a kernel argument readable via /proc/cmdline by programs
running once the system is up.

-The number of kernel parameters is not limited, but the length of the
+The number of kernel parameters is limited to 32 by default (128 in User Mode
+Linux), and is defined in ./init/main.c as MAX_INIT_ARGS. The length of the
complete command line (parameters including spaces etc.) is limited to
a fixed number of characters. This limit depends on the architecture
and is between 256 and 4096 characters. It is defined in the file
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