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fix little spell problem

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Administrator 2015-08-19 12:26:06 +08:00
parent 1b6650eaa2
commit 90cc6f01e3
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Misc/how_kernel_compiled.md
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@ -18,9 +18,9 @@ Preparation before the kernel compilation
--------------------------------------------------------------------------------- ---------------------------------------------------------------------------------
There are many things to prepare before the kernel compilation can be started. The main point here is to find and configure There are many things to prepare before the kernel compilation can be started. The main point here is to find and configure
The type of compilation, to parse command line arguments that are passed to `make`, etc... So let's dive into the top `Makefile` of the Linux kernel. the type of compilation, to parse command line arguments that are passed to `make`, etc... So let's dive into the top `Makefile` of Linux kernel.
The Linux kernel top `Makefile` is responsible for building two major products: [vmlinux](https://en.wikipedia.org/wiki/Vmlinux) (the resident kernel image) and the modules (any module files). The [Makefile](https://github.com/torvalds/linux/blob/master/Makefile) of the Linux kernel starts with the definition of the following variables: The top `Makefile` of Linux kernel is responsible for building two major products: [vmlinux](https://en.wikipedia.org/wiki/Vmlinux) (the resident kernel image) and the modules (any module files). The [Makefile](https://github.com/torvalds/linux/blob/master/Makefile) of the Linux kernel starts with the definition of following variables:
```Makefile ```Makefile
VERSION = 4 VERSION = 4
@ -30,13 +30,13 @@ EXTRAVERSION = -rc3
NAME = Hurr durr I'ma sheep NAME = Hurr durr I'ma sheep
``` ```
These variables determine the current version of the Linux kernel and are used in the different places, for example in the forming of the `KERNELVERSION` variable: These variables determine the current version of Linux kernel and are used in different places, for example in the forming of the `KERNELVERSION` variable in the same `Makefile`:
```Makefile ```Makefile
KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
``` ```
After this we can see a couple of `ifeq` conditionals that check some of the parameters passed to `make`. The Linux kernel `makefiles` provides a special `make help` target that prints all available targets and some of the command line arguments that can be passed to `make`. For example: `make V=1` - provides verbose builds. The first `ifeq` checks if the `V=n` option is passed to make: After this we can see a couple of `ifeq` conditions that check some of the parameters passed to `make`. The Linux kernel `makefiles` provides a special `make help` target that prints all available targets and some of the command line arguments that can be passed to `make`. For example : `make V=1` => verbose build. The first `ifeq` checks whether the `V=n` option is passed to `make`:
```Makefile ```Makefile
ifeq ("$(origin V)", "command line") ifeq ("$(origin V)", "command line")