[PATCH] riscv: Partially revert "Remove stat64 family from default syscall set"

From: Alistair Francis <Alistair.Francis@wdc.com>
To: "linux-riscv@lists.infradead.org" <linux-riscv@lists.infradead.org>
Cc: "alistair23@gmail.com" <alistair23@gmail.com>,
	"palmer@sifive.com" <palmer@sifive.com>,
	Alistair Francis <Alistair.Francis@wdc.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: [PATCH] riscv: Partially revert "Remove stat64 family from default syscall set"
Date: Thu, 7 Feb 2019 22:55:57 +0000	[thread overview]
Message-ID: <20190207225531.19219-1-alistair.francis@wdc.com> (raw)

To fix systemd/sysVinit crashes enable __ARCH_WANT_STAT64.

systemd failed to start with this error for 32-bit RISC-V:
[    2.833864] Run /sbin/init as init process
/sbin/init: error while loading shared libraries: libsystemd-shared-239.so: cannot stat shared object: Error 38
[    2.933593] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00007f00
[    2.934120] CPU: 0 PID: 1 Comm: init Not tainted 5.0.0-rc4-yoctodev-standard #1
[    2.934589] Call Trace:
[    2.934919] [<c0048a30>] walk_stackframe+0x0/0xa0
[    2.935243] [<c0048c14>] show_stack+0x28/0x32
[    2.935518] [<c05fa418>] dump_stack+0x68/0x88
[    2.935788] [<c004de48>] panic+0xf0/0x252
[    2.936041] [<c0051780>] do_exit+0x7de/0x7fc
[    2.936387] [<c00517f4>] do_group_exit+0x2a/0x82
[    2.936674] [<c005185e>] __wake_up_parent+0x0/0x22
[    2.936982] [<c00475fa>] ret_from_syscall+0x0/0xe
[    2.937673] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x00007f00 ]---

sysVinit had a similar problem as well. By enabling __ARCH_WANT_STAT64
for 32-bit RISC-V the problem disapears and 32-bit RISC-V is able to
boot.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
---
This was tested with this fork of glibc to enable 32-bit RISC-V support:
https://github.com/riscv/riscv-glibc/tree/riscv-glibc-2.29
commit: 04fdd476160a55792a75375ba2bf56c761f811c2

I'm not sure if this is a glibc problem or a kernel problem, but this
commit caused the breakage between the 4.19 and 4.20 kernel so I'm
sending out a patch. Let me know your thoughts

arch/riscv/include/uapi/asm/unistd.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/riscv/include/uapi/asm/unistd.h b/arch/riscv/include/uapi/asm/unistd.h
index 1f3bd3ebbb0d..031b7d78e11c 100644
--- a/arch/riscv/include/uapi/asm/unistd.h
+++ b/arch/riscv/include/uapi/asm/unistd.h
@@ -20,6 +20,9 @@
 #endif /* __LP64__ */
 
 #include <asm-generic/unistd.h>
+#if __BITS_PER_LONG == 32
+#define __ARCH_WANT_STAT64
+#endif
 
 /*
  * Allows the instruction cache to be flushed from userspace.  Despite RISC-V
-- 
2.20.1


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