Re: [xen-tip:linux-next 12/12] WARNING: modpost: vmlinux: section mismatch in reference: mc_debug_data+0x0 (section: .data) -> mc_debug_data_early (section: .init.data)

From: Jürgen Groß
Date: Thu Mar 27 2025 - 10:23:34 EST

On 27.03.25 15:13, Borislav Petkov wrote:
On Wed, Jul 24, 2024 at 11:55:39AM +0200, Jürgen Groß wrote:
I'd prefer a general way to handle this problem, like e.g. some kind of
__refdata tagging for percpu variables.

Any reason for not doing the trivial thing?

diff --git a/arch/x86/xen/multicalls.c b/arch/x86/xen/multicalls.c
index 10c660fae8b3..100bfaba3f4d 100644
--- a/arch/x86/xen/multicalls.c
+++ b/arch/x86/xen/multicalls.c
@@ -53,7 +53,7 @@ struct mc_debug_data {
};
static DEFINE_PER_CPU(struct mc_buffer, mc_buffer);
-static struct mc_debug_data mc_debug_data_early __initdata;
+static struct mc_debug_data mc_debug_data_early;
static DEFINE_PER_CPU(struct mc_debug_data *, mc_debug_data) =
&mc_debug_data_early;
static struct mc_debug_data __percpu *mc_debug_data_ptr;

Well, that is wasting nearly 3kB of the data section.

Maybe not a big deal, but still...


Juergen

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