linux-kernel - [PATCH 0/2] RISC-V: Handle the siginfo

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Message-Id: <20190703001842.12238-1-alistair.francis@wdc.com>
Date:   Tue,  2 Jul 2019 17:18:40 -0700
From:   Alistair Francis <alistair.francis@....com>
To:     linux-riscv-bounces@...ts.infradead.org, arnd@...db.de
Cc:     linux-kernel@...r.kernel.org, alistair23@...il.com,
        Alistair Francis <alistair.francis@....com>
Subject: [PATCH 0/2] RISC-V: Handle the siginfo_t offset problem

In the RISC-V 32-bit glibc port [1] the siginfo_t struct in the kernel
doesn't line up with the struct in glibc. In glibc world the _sifields
union is 8 byte alligned (although I can't figure out why) while in the
kernel wordl the _sifields union is 4 bytes alligned. This results in
information being lost in the waitid syscall.

This doesn't seem to be a great fix, but it is somewhat similar to what
x32 does (which has 64-bit time_t like RV32) and I can't figure out why
the two allignments are different.

1: https://github.com/alistair23/glibc/commits/alistair/rv32.next

Alistair Francis (2):
  uapi/asm-generic: Allow defining a custom __SIGINFO struct
  riscv/include/uapi: Define a custom __SIGINFO struct for RV32

 arch/riscv/include/uapi/asm/siginfo.h | 32 +++++++++++++++++++++++++++
 include/uapi/asm-generic/siginfo.h    | 32 ++++++++++++++-------------
 2 files changed, 49 insertions(+), 15 deletions(-)
 create mode 100644 arch/riscv/include/uapi/asm/siginfo.h

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2.22.0