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kbuild: redo fake deps at include/config/*.h

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Make include/config/foo/bar.h fake deps files generation simpler.

* delete .h suffix
	those aren't header files, shorten filenames,

* delete tolower()
	Linux filesystems can deal with both upper and lowercase
	filenames very well,

* put everything in 1 directory
	Presumably 'mkdir -p' split is from dark times when filesystems
	handled huge directories badly, disks were round adding to
	seek times.

	x86_64 allmodconfig lists 12364 files in include/config.

	../obj/include/config/
	├── 104_QUAD_8
	├── 60XX_WDT
	├── 64BIT
		...
	├── ZSWAP_DEFAULT_ON
	├── ZSWAP_ZPOOL_DEFAULT
	└── ZSWAP_ZPOOL_DEFAULT_ZBUD

	0 directories, 12364 files

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Alexey Dobriyan
2021-04-15 20:36:07 +03:00
committed by Masahiro Yamada
parent e3456056f1
commit 0e0345b77a
6 changed files with 16 additions and 52 deletions
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15
scripts/kconfig/confdata.c
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@@ -130,19 +130,14 @@ static size_t depfile_prefix_len;
static int conf_touch_dep(const char *name)
{
int fd, ret;
const char *s;
char *d, c;
char *d;
/* check overflow: prefix + name + ".h" + '\0' must fit in buffer. */
if (depfile_prefix_len + strlen(name) + 3 > sizeof(depfile_path))
/* check overflow: prefix + name + '\0' must fit in buffer. */
if (depfile_prefix_len + strlen(name) + 1 > sizeof(depfile_path))
return -1;
d = depfile_path + depfile_prefix_len;
s = name;
while ((c = *s++))
*d++ = (c == '_') ? '/' : tolower(c);
strcpy(d, ".h");
strcpy(d, name);
/* Assume directory path already exists. */
fd = open(depfile_path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
@@ -465,7 +460,7 @@ load:
* Reading from include/config/auto.conf
* If CONFIG_FOO previously existed in
* auto.conf but it is missing now,
* include/config/foo.h must be touched.
* include/config/FOO must be touched.
*/
conf_touch_dep(line + strlen(CONFIG_));
else