kbuild: whitelist section mismatch in init/main.c

From: Sam Ravnborg
Date: Mon Feb 26 2007 - 10:45:41 EST


In init/main.c we have a reference from rest_init() to .init.text
which is intentional.
Rename the function 'init' to 'kernel_init' to make it a
kernel wide unique symbol and whitelist the reference.

Signed-off-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
---
init/main.c | 6 +++---
scripts/mod/modpost.c | 15 ++++++++++++++-
2 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/init/main.c b/init/main.c
index a92989e..7a92b4c 100644
--- a/init/main.c
+++ b/init/main.c
@@ -82,7 +82,7 @@
#warning gcc-4.1.0 is known to miscompile the kernel. A different compiler version is recommended.
#endif

-static int init(void *);
+static int kernel_init(void *);

extern void init_IRQ(void);
extern void fork_init(unsigned long);
@@ -435,7 +435,7 @@ static void __init setup_command_line(char *command_line)
static void noinline rest_init(void)
__releases(kernel_lock)
{
- kernel_thread(init, NULL, CLONE_FS | CLONE_SIGHAND);
+ kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND);
numa_default_policy();
unlock_kernel();

@@ -772,7 +772,7 @@ static int noinline init_post(void)
panic("No init found. Try passing init= option to kernel.");
}

-static int __init init(void * unused)
+static int __init kernel_init(void * unused)
{
lock_kernel();
/*
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index ecf5dff..1c076bf 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -589,7 +589,7 @@ static int strrcmp(const char *s, const char *sub)
* the pattern is identified by:
* tosec = .init.text | .exit.text | .init.data
* fromsec = .data
- * atsym = *driver, *_template, *_sht, *_ops, *_probe, *probe_one
+ * atsym = *driver, *_template, *_sht, *_ops, *_probe, *probe_one, *_console
*
* Pattern 3:
* Some symbols belong to init section but still it is ok to reference
@@ -599,6 +599,14 @@ static int strrcmp(const char *s, const char *sub)
* For ex. symbols marking the init section boundaries.
* This pattern is identified by
* refsymname = __init_begin, _sinittext, _einittext
+ * Pattern 4:
+ * During the early init phase we have references from .init.text to
+ * .text we have an intended section mismatch - do not warn about it.
+ * See kernel_init() in init/main.c
+ * tosec = .init.text
+ * fromsec = .text
+ * atsym = kernel_init
+ * Some symbols belong to init section but still it is ok to reference
**/
static int secref_whitelist(const char *modname, const char *tosec,
const char *fromsec, const char *atsym,
@@ -668,6 +676,11 @@ static int secref_whitelist(const char *modname, const char *tosec,
if (strcmp(refsymname, *s) == 0)
return 1;
}
+ /* Check for pattern 4 */
+ if ((strcmp(tosec, ".init.text") == 0) &&
+ (strcmp(fromsec, ".text") == 0) &&
+ (strcmp(refsymname, "kernel_init") == 0))
+ return 1;
return 0;
}

--
1.4.4.2