linux-kernel - [PATCH] arm64/sve: fix genksyms generation

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Date:   Mon, 17 Jun 2019 12:42:11 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Dave Martin <Dave.Martin@....com>
Cc:     Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        Alex Bennée <alex.bennee@...aro.org>,
        Peter Maydell <peter.maydell@...aro.org>,
        Alan Hayward <alan.hayward@....com>,
        Julien Grall <julien.grall@....com>,
        Marc Zyngier <marc.zyngier@....com>,
        Mark Rutland <mark.rutland@....com>,
        Andrew Murray <andrew.murray@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] arm64/sve: fix genksyms generation

genksyms does not understand __uint128_t, so we get a build failure
in the fpsimd module when it cannot export a symbol right:

WARNING: EXPORT symbol "kernel_neon_begin" [vmlinux] version generation failed, symbol will not be versioned.
/home/arnd/cross/x86_64/gcc-8.1.0-nolibc/aarch64-linux/bin/aarch64-linux-ld: arch/arm64/kernel/fpsimd.o: relocation R_AARCH64_ABS32 against `__crc_kernel_neon_begin' can not be used when making a shared object
arch/arm64/kernel/fpsimd.o:(.data+0x0): dangerous relocation: unsupported relocation
arch/arm64/kernel/fpsimd.o:(".discard.addressable"+0x0): dangerous relocation: unsupported relocation
arch/arm64/kernel/fpsimd.o:(".discard.addressable"+0x8): dangerous relocation: unsupported relocation

We could teach genksyms about the type, but it's easier to just
work around it by defining that type locally in a way that genksyms
understands.

Fixes: 41040cf7c5f0 ("arm64/sve: Fix missing SVE/FPSIMD endianness conversions")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 arch/arm64/kernel/fpsimd.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c
index 07f238ef47ae..2aba07cccf50 100644
--- a/arch/arm64/kernel/fpsimd.c
+++ b/arch/arm64/kernel/fpsimd.c
@@ -400,6 +400,9 @@ static int __init sve_sysctl_init(void) { return 0; }
 #define ZREG(sve_state, vq, n) ((char *)(sve_state) +		\
 	(SVE_SIG_ZREG_OFFSET(vq, n) - SVE_SIG_REGS_OFFSET))

+#ifdef __GENKSYMS__
+typedef __u64 __uint128_t[2];
+#endif
 #ifdef CONFIG_CPU_BIG_ENDIAN
 static __uint128_t arm64_cpu_to_le128(__uint128_t x)
 {
-- 
2.20.0