linux: Update to the 5.2 kernel headers

OE-Core has upgraded to the 5.2 kernel headers. This means that all RV32
software now requires a 64-bit time_t. Update the glibc fork to an
implementation that works in a 64-bit time_t. At the same time we can
revert the linux kernel patch.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

recipes-core/glibc/glibc_%.bbappend

@@ -1,6 +1,10 @@
 # Upstream Glibc does not yet have RISC-V 32-bit support
 
-# This is the most recent port sent to the glibc mailing list
-GLIBC_GIT_URI_qemuriscv32 = "git://github.com/riscv/riscv-glibc.git"
-SRCBRANCH_qemuriscv32 = "riscv-glibc-2.29"
-SRCREV_glibc_qemuriscv32 = "06983fe52cfe8e4779035c27e8cc5d2caab31531"
+GLIBC_GIT_URI_qemuriscv32 = "git://github.com/alistair23/glibc.git"
+SRCBRANCH_qemuriscv32 = "alistair/rv32.rfc5"
+SRCREV_glibc_qemuriscv32 = "1fe4adcab0084df29f4c18c2d5f1154a1eeb119d"
+
+SRC_URI_remove_qemuriscv32 = " \
+    file://0001-x86-64-memcmp-Use-unsigned-Jcc-instructions-on-size-.patch \
+    file://CVE-2019-9169.patch \
+"

recipes-kernel/linux/files/0001-Revert-riscv-Use-latest-system-call-ABI.patch

@@ -1,67 +0,0 @@
-From 15f62343916fcb3cae82e618da28eaa82bc8c007 Mon Sep 17 00:00:00 2001
-From: Alistair Francis <alistair.francis@wdc.com>
-Date: Tue, 16 Apr 2019 09:03:41 -0700
-Subject: [PATCH] Revert "riscv: Use latest system call ABI"
-
-This reverts commit d4c08b9776b392e20efc6198ebe1bc8ec1911d9b.
-
-The latest RISC-V 32bit glibc submission doesn't work with this patch,
-so let's revert it. This revert can be reverted when the glibc
-submission is updated to work on the 5.1 kernel.
-
-Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
-Upstream-Status: Inappropriate [enable feature]
----
- arch/riscv/Kconfig                   | 1 +
- arch/riscv/include/uapi/asm/unistd.h | 5 ++++-
- arch/riscv/kernel/vdso/Makefile      | 2 --
- 3 files changed, 5 insertions(+), 3 deletions(-)
-
-diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
-index eb56c82d8aa1..43dd2680c696 100644
---- a/arch/riscv/Kconfig
-+++ b/arch/riscv/Kconfig
-@@ -11,6 +11,7 @@ config 32BIT
- 
- config RISCV
- 	def_bool y
-+	select ARCH_32BIT_OFF_T if !64BIT
- 	# even on 32-bit, physical (and DMA) addresses are > 32-bits
- 	select PHYS_ADDR_T_64BIT
- 	select OF
-diff --git a/arch/riscv/include/uapi/asm/unistd.h b/arch/riscv/include/uapi/asm/unistd.h
-index 0e2eeeb1fd27..486a288b454c 100644
---- a/arch/riscv/include/uapi/asm/unistd.h
-+++ b/arch/riscv/include/uapi/asm/unistd.h
-@@ -17,8 +17,11 @@
- 
- #ifdef __LP64__
- #define __ARCH_WANT_NEW_STAT
--#define __ARCH_WANT_SET_GET_RLIMIT
- #endif /* __LP64__ */
-+#define __ARCH_WANT_SET_GET_RLIMIT
-+#ifndef __LP64__
-+#define __ARCH_WANT_TIME32_SYSCALLS
-+#endif
- 
- #include <asm-generic/unistd.h>
- 
-diff --git a/arch/riscv/kernel/vdso/Makefile b/arch/riscv/kernel/vdso/Makefile
-index fec62b24df89..eed1c137f618 100644
---- a/arch/riscv/kernel/vdso/Makefile
-+++ b/arch/riscv/kernel/vdso/Makefile
-@@ -2,11 +2,9 @@
- 
- # Symbols present in the vdso
- vdso-syms  = rt_sigreturn
--ifdef CONFIG_64BIT
- vdso-syms += gettimeofday
- vdso-syms += clock_gettime
- vdso-syms += clock_getres
--endif
- vdso-syms += getcpu
- vdso-syms += flush_icache
- 
--- 
-2.21.0
-

recipes-kernel/linux/linux-mainline_5.2.bb

@@ -19,9 +19,6 @@ SRC_URI_append_freedom-u540 = " \
     file://0007-HACK-radeon-Don-t-set-PCI-DMA-mask.patch \
 "
 
-# Fix a breakage with the current 32bit glibc fork
-SRC_URI_append_qemuriscv32 = " file://0001-Revert-riscv-Use-latest-system-call-ABI.patch"
-
 KERNEL_DEVICETREE_freedom-u540 = "sifive/${RISCV_SBI_FDT}"
 
 # freedom-u540 uses out-of-tree defconfig