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Subject[PATCH v2] x86,nmi: Fix section mismatch warnings on 32-bit (cleaner)
Date
I tried to fix the following section mismatch warnings in commit eeaaa96:

VDSOSYM arch/x86/vdso/vdso32-syms.lds
LD arch/x86/vdso/built-in.o
LD arch/x86/built-in.o
WARNING: arch/x86/built-in.o(.data+0x5af0): Section mismatch in reference from the variable
test_nmi_ipi_callback_na.10451 to the function .init.text:test_nmi_ipi_callback()
The variable test_nmi_ipi_callback_na.10451 references
the function __init test_nmi_ipi_callback()
If the reference is valid then annotate the
variable with __init* or __refdata (see linux/init.h) or name the variable:
*_template, *_timer, *_sht, *_ops, *_probe, *_probe_one, *_console

WARNING: arch/x86/built-in.o(.data+0x5b04): Section mismatch in reference from the variable
nmi_unk_cb_na.10399 to the function .init.text:nmi_unk_cb()
The variable nmi_unk_cb_na.10399 references
the function __init nmi_unk_cb()
If the reference is valid then annotate the
variable with __init* or __refdata (see linux/init.h) or name the variable:
*_template, *_timer, *_sht, *_ops, *_probe, *_probe_one, *_console

However, Li Zhong found an easier and cleaner way to do this by using variable
arguments. I like his way better. It is easier to maintain.

Reported-by: Witold Baryluk <baryluk@smp.if.uj.edu.pl>
Cc: Jan Beulich <JBeulich@suse.com>
Signed-off-by: Li Zhong <zhong@linux.vnet.ibm.com>
Signed-off-by: Don Zickus <dzickus@redhat.com>
---
arch/x86/include/asm/nmi.h | 20 +++-----------------
arch/x86/kernel/nmi_selftest.c | 7 ++++---
2 files changed, 7 insertions(+), 20 deletions(-)

---
Hi Ingo,

This combination patch doesn't look as ugly as I thought it did. Sorry for the patch noise.

Cheers,
Don

diff --git a/arch/x86/include/asm/nmi.h b/arch/x86/include/asm/nmi.h
index dc580c4..c0fa356 100644
--- a/arch/x86/include/asm/nmi.h
+++ b/arch/x86/include/asm/nmi.h
@@ -44,28 +44,14 @@ struct nmiaction {
const char *name;
};

-#define register_nmi_handler(t, fn, fg, n) \
+#define register_nmi_handler(t, fn, fg, n, init...) \
({ \
- static struct nmiaction fn##_na = { \
+ static struct nmiaction init fn##_na = { \
.handler = (fn), \
.name = (n), \
.flags = (fg), \
}; \
- __register_nmi_handler((t), &fn##_na); \
-})
-
-/*
- * For special handlers that register/unregister in the
- * init section only. This should be considered rare.
- */
-#define register_nmi_handler_initonly(t, fn, fg, n) \
-({ \
- static struct nmiaction fn##_na __initdata = { \
- .handler = (fn), \
- .name = (n), \
- .flags = (fg), \
- }; \
- __register_nmi_handler((t), &fn##_na); \
+ __register_nmi_handler((t), &fn##_na); \
})

int __register_nmi_handler(unsigned int, struct nmiaction *);
diff --git a/arch/x86/kernel/nmi_selftest.c b/arch/x86/kernel/nmi_selftest.c
index 149b8d9..6d9582e 100644
--- a/arch/x86/kernel/nmi_selftest.c
+++ b/arch/x86/kernel/nmi_selftest.c
@@ -42,7 +42,8 @@ static int __init nmi_unk_cb(unsigned int val, struct pt_regs *regs)
static void __init init_nmi_testsuite(void)
{
/* trap all the unknown NMIs we may generate */
- register_nmi_handler_initonly(NMI_UNKNOWN, nmi_unk_cb, 0, "nmi_selftest_unk");
+ register_nmi_handler(NMI_UNKNOWN, nmi_unk_cb, 0, "nmi_selftest_unk",
+ __initdata);
}

static void __init cleanup_nmi_testsuite(void)
@@ -64,8 +65,8 @@ static void __init test_nmi_ipi(struct cpumask *mask)
{
unsigned long timeout;

- if (register_nmi_handler_initonly(NMI_LOCAL, test_nmi_ipi_callback,
- NMI_FLAG_FIRST, "nmi_selftest")) {
+ if (register_nmi_handler(NMI_LOCAL, test_nmi_ipi_callback,
+ NMI_FLAG_FIRST, "nmi_selftest", __initdata)) {
nmi_fail = FAILURE;
return;
}
--
1.7.7.6


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