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kbuild: introduce __init_refok/__initdata_refok to supress section mismatch warnings

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Throughout the kernel there are a few legitimite references
to init or exit sections. Most of these are covered by the
patterns included in modpost but a few nees special attention.
To avoid hardcoding a lot of function names in modpost introduce
a marker so relevant function/data can be marked.
When modpost see a reference to a init/exit function from
a function/data marked no warning will be issued.

Idea from: Andrew Morton <akpm@linux-foundation.org>

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Sam Ravnborg 2007-05-17 20:14:48 +02:00
parent ca967258b6
commit 0e0d314e6a
3 changed files with 28 additions and 2 deletions
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11
scripts/mod/modpost.c
View file

@ -583,6 +583,12 @@ static int strrcmp(const char *s, const char *sub)
/**
* Whitelist to allow certain references to pass with no warning.
*
* Pattern 0:
* Do not warn if funtion/data are marked with __init_refok/__initdata_refok.
* The pattern is identified by:
* fromsec = .text.init.refok | .data.init.refok
*
* Pattern 1:
* If a module parameter is declared __initdata and permissions=0
* then this is legal despite the warning generated.
@ -686,6 +692,11 @@ static int secref_whitelist(const char *modname, const char *tosec,
NULL
};
/* Check for pattern 0 */
if ((strcmp(fromsec, ".text.init.refok") == 0) ||
(strcmp(fromsec, ".data.init.refok") == 0))
return 1;
/* Check for pattern 1 */
if (strcmp(tosec, ".init.data") != 0)
f1 = 0;