linux-kernel - [PATCH 1/2] kbuild: provide include/asm/asm-prototypes.h for ARM

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Message-Id: <20161122110557.1533467-1-arnd@arndb.de>
Date:   Tue, 22 Nov 2016 12:05:40 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Russell King <linux@...linux.org.uk>
Cc:     Uwe Kleine-König <uwe@...ine-koenig.org>,
        Nicolas Pitre <nico@...aro.org>,
        linux-arm-kernel@...ts.infradead.org,
        Nicholas Piggin <npiggin@...il.com>, viro@...iv.linux.org.uk,
        linux-kbuild@...r.kernel.org, linux-arch@...r.kernel.org,
        regressions@...mhuis.info, Arnd Bergmann <arnd@...db.de>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] kbuild: provide include/asm/asm-prototypes.h for ARM

This adds an asm/asm-prototypes.h header for ARM to fix the broken symbol
versioning for symbols exported from assembler files.

I couldn't find the correct prototypes for the compiler builtins,
so I went with the fake 'void f(void)' prototypes that we had
before, restoring the state before they were moved.

Originally I assumed that the problem was just a harmless warning
in unusual configurations, but as Uwe found, we actually need this
to load most modules when symbol versioning is enabled, as it is
in many distro kernels.

Cc: Uwe Kleine-König <uwe@...ine-koenig.org>
Fixes: 4dd1837d7589 ("arm: move exports to definitions")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
Compared to the earlier version, I dropped the changes to the
csumpartial files, which now get handled correctly by Kbuild
even when the export comes from a macro, and I also dropped the
changes to the bitops files, which were already fixed in a
patch from Nico.

The patch applies cleanly on top of the rmk/fixes tree but has
no effect there, as it also needs 4efca4ed05cb ("kbuild: modversions
for EXPORT_SYMBOL() for asm") and cc6acc11cad1 ("kbuild: be more
careful about matching preprocessed asm ___EXPORT_SYMBOL").

With the combination of rmk/fixes, torvalds/master and these two
patches, symbol versioning works again on ARM. As it is still
broken on almost all other architectures (powerpc is fixed,
x86 has a patch), I wonder if we should make CONFIG_MODVERSIONS
as broken for everything else.
---
 arch/arm/include/asm/asm-prototypes.h | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 arch/arm/include/asm/asm-prototypes.h

diff --git a/arch/arm/include/asm/asm-prototypes.h b/arch/arm/include/asm/asm-prototypes.h
new file mode 100644
index 000000000000..04e5616a7b15
--- /dev/null
+++ b/arch/arm/include/asm/asm-prototypes.h
@@ -0,0 +1,34 @@
+#include <linux/arm-smccc.h>
+#include <linux/bitops.h>
+#include <linux/ftrace.h>
+#include <linux/io.h>
+#include <linux/platform_data/asoc-imx-ssi.h>
+#include <linux/string.h>
+#include <linux/uaccess.h>
+
+#include <asm/checksum.h>
+#include <asm/div64.h>
+#include <asm/memory.h>
+
+extern void __aeabi_idivmod(void);
+extern void __aeabi_idiv(void);
+extern void __aeabi_lasr(void);
+extern void __aeabi_llsl(void);
+extern void __aeabi_llsr(void);
+extern void __aeabi_lmul(void);
+extern void __aeabi_uidivmod(void);
+extern void __aeabi_uidiv(void);
+extern void __aeabi_ulcmp(void);
+
+extern void __ashldi3(void);
+extern void __ashrdi3(void);
+extern void __bswapdi2(void);
+extern void __bswapsi2(void);
+extern void __divsi3(void);
+extern void __do_div64(void);
+extern void __lshrdi3(void);
+extern void __modsi3(void);
+extern void __muldi3(void);
+extern void __ucmpdi2(void);
+extern void __udivsi3(void);
+extern void __umodsi3(void);
-- 
2.9.0