Documentation: update kbuild make typos/grammar/text flow

Update section 3.7 examples to reflect the current state of the
Makefiles used. Fix spelling and grammar errors along with flow of text.

Signed-off-by: matt mooney <mfm@muteddisk.com>
Reviewed-by: WANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 25 insertions, 28 deletions

diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt
index d77e24e0055d..31bfcbf958fc 100644
--- a/Documentation/kbuild/makefiles.txt
+++ b/Documentation/kbuild/makefiles.txt
@@ -285,45 +285,42 @@ more details, with real examples.
 --- 3.7 Compilation flags
 
     ccflags-y, asflags-y and ldflags-y
-        The three flags listed above applies only to the kbuild makefile
-        where they are assigned. They are used for all the normal
-        cc, as and ld invocation happenign during a recursive build.
+        The three flags listed above apply only to the kbuild makefile where
+        they are assigned (i.e., per-directory). They are used for all the
+        normal cc, as and ld invocation happening during a recursive build.
         Note: Flags with the same behaviour were previously named:
-        EXTRA_CFLAGS, EXTRA_AFLAGS and EXTRA_LDFLAGS.
-        They are yet supported but their use are deprecated.
+        EXTRA_CFLAGS, EXTRA_AFLAGS and EXTRA_LDFLAGS. They are still
+        supported but their use is deprecated.
 
-        ccflags-y specifies options for compiling C files with $(CC).
+        ccflags-y specifies options for compiling with $(CC).
 
         Example:
-                # drivers/sound/emu10k1/Makefile
-                ccflags-y += -I$(obj)
-                ccflags-$(DEBUG) += -DEMU10K1_DEBUG
-
+                # drivers/acpi/Makefile
+                ccflags-y := -Os
+                ccflags-$(CONFIG_ACPI_DEBUG) += -DACPI_DEBUG_OUTPUT
 
         This variable is necessary because the top Makefile owns the
         variable $(KBUILD_CFLAGS) and uses it for compilation flags for the
         entire tree.
 
-        asflags-y is a similar string for per-directory options
-        when compiling assembly language source.
+        asflags-y specifies options for assembling with $(AS).
 
         Example:
-                #arch/x86_64/kernel/Makefile
-                asflags-y := -traditional
-
+                #arch/sparc/kernel/Makefile
+                asflags-y := -ansi
 
-        ldflags-y is a string for per-directory options to $(LD).
+        ldflags-y specifies options for linking with $(LD).
 
         Example:
-                #arch/m68k/fpsp040/Makefile
-                ldflags-y := -x
+                #arch/cris/boot/compressed/Makefile
+                ldflags-y += -T $(srctree)/$(src)/decompress_$(arch-y).lds
 
     subdir-ccflags-y, subdir-asflags-y
-        The two flags listed above are similar to ccflags-y and as-falgs-y.
-        The difference is that the subdir- variants has effect for the kbuild
-        file where tey are present and all subdirectories.
-        Options specified using subdir-* are added to the commandline before
-        the options specified using the non-subdir variants.
+        The two flags listed above are similar to ccflags-y and asflags-y.
+        The difference is that the subdir- variants affect the kbuild
+        file where they are present and all subdirectories. Options specified
+        using subdir-* are added to the commandline before the options
+        specified using the non-subdir variants.
 
         Example:
                 subdir-ccflags-y := -Werror
@@ -341,18 +338,18 @@ more details, with real examples.
                 CFLAGS_aha152x.o =   -DAHA152X_STAT -DAUTOCONF
                 CFLAGS_gdth.o    = # -DDEBUG_GDTH=2 -D__SERIAL__ -D__COM2__ \
                                      -DGDTH_STATISTICS
-                CFLAGS_seagate.o =   -DARBITRATE -DPARITY -DSEAGATE_USE_ASM
 
-        These three lines specify compilation flags for aha152x.o,
-        gdth.o, and seagate.o
+        These two lines specify compilation flags for aha152x.o and gdth.o.
 
         $(AFLAGS_$@) is a similar feature for source files in assembly
         languages.
 
         Example:
                 # arch/arm/kernel/Makefile
-                AFLAGS_head-armv.o := -DTEXTADDR=$(TEXTADDR) -traditional
-                AFLAGS_head-armo.o := -DTEXTADDR=$(TEXTADDR) -traditional
+                AFLAGS_head.o        := -DTEXT_OFFSET=$(TEXT_OFFSET)
+                AFLAGS_crunch-bits.o := -Wa,-mcpu=ep9312
+                AFLAGS_iwmmxt.o      := -Wa,-mcpu=iwmmxt
+
 
 --- 3.9 Dependency tracking