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modutils: add FEATURE_INSMOD_TRY_MMAP option

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function                                             old     new   delta
try_to_mmap_module                                     -     121    +121
bb_init_module_24                                   4514    4578     +64
bb_init_module                                       119     173     +54
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(add/remove: 1/0 grow/shrink: 2/0 up/down: 239/0)             Total: 239 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2009-10-25 04:35:22 +01:00
parent 30f3c1d5fd
commit 77c066ea5c
4 changed files with 92 additions and 16 deletions
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16
modutils/Config.in
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@@ -121,6 +121,22 @@ config FEATURE_2_4_MODULES
This increases size considerably. Say N unless you plan
to run ancient kernels.
config FEATURE_INSMOD_TRY_MMAP
bool "Try to load module from a mmap'ed area"
default n
depends on INSMOD || MODPROBE_SMALL
help
This option causes module loading code to try to mmap
module first. If it does not work (for example,
it does not work for compressed modules), module will be read
(and unpacked if needed) into a memory block allocated by malloc.
The only case when mmap works but malloc does not is when
you are trying to load a big module on a very memory-constrained
machine. Malloc will momentarily need 2x as much memory as mmap.
Choosing N saves about 250 bytes of code (on 32-bit x86).
config FEATURE_INSMOD_VERSION_CHECKING
bool "Enable module version checking"
default n