linux-kernel - [PATCH] omapfb: don't annotate dss_conv_list as _

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Date:   Tue,  5 May 2020 16:03:52 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Marco Elver <elver@...gle.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Allison Randal <allison@...utok.net>,
        Alexios Zavras <alexios.zavras@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Enrico Weigelt <info@...ux.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-omap@...r.kernel.org, linux-fbdev@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: [PATCH] omapfb: don't annotate dss_conv_list as __initdata

With the kcsan changes, __read_once_size() is not inlined, but
clang can decide to emit a version that hardcodes the address, which
in turn triggers a warning for dss_conv_list being __initdata but
__read_once_size() not being __init:

WARNING: modpost: vmlinux.o(.text+0x6e4d7a): Section mismatch in
reference from the function __read_once_size() to the variable
.init.data:dss_conv_list
The function __read_once_size() references
the variable __initdata dss_conv_list.
This is often because __read_once_size lacks a __initdata
annotation or the annotation of dss_conv_list is wrong.

This is clearly a false positive warning, but it's hard to tell
who is to blame for it. Work around it by removing the __initdata
annotation, wasting the space of two pointers in return for getting
rid of the warning.

Fixes: dfd402a4c4ba ("kcsan: Add Kernel Concurrency Sanitizer infrastructure")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/video/fbdev/omap2/omapfb/dss/omapdss-boot-init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/video/fbdev/omap2/omapfb/dss/omapdss-boot-init.c b/drivers/video/fbdev/omap2/omapfb/dss/omapdss-boot-init.c
index 0ae0cab252d3..29fdff9c95f6 100644
--- a/drivers/video/fbdev/omap2/omapfb/dss/omapdss-boot-init.c
+++ b/drivers/video/fbdev/omap2/omapfb/dss/omapdss-boot-init.c
@@ -19,7 +19,7 @@
 #include <linux/slab.h>
 #include <linux/list.h>
 
-static struct list_head dss_conv_list __initdata;
+static struct list_head dss_conv_list;
 
 static const char prefix[] __initconst = "omapdss,";
 
-- 
2.26.0