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SubjectCommit 594cc251fdd0 (user_access_begin does access_ok) made arch/sh stop booting on qemu.
Date
That's what I bisected it to, anyway. Commit before that boots to a shell prompt
under qemu-system-sh4 (built from today's git), after produces no console output
(no boot messages, no nothin').

Rob
# make ARCH=sh allnoconfig KCONFIG_ALLCONFIG=sh4.miniconf
# make ARCH=sh -j $(nproc)
# boot arch/sh/boot/zImage


CONFIG_CPU_SUBTYPE_SH7751R=y
CONFIG_MMU=y
CONFIG_MEMORY_START=0x0c000000
CONFIG_VSYSCALL=y
CONFIG_SH_FPU=y
CONFIG_SH_RTS7751R2D=y
CONFIG_RTS7751R2D_PLUS=y
CONFIG_SERIAL_SH_SCI=y
CONFIG_SERIAL_SH_SCI_CONSOLE=y

CONFIG_PCI=y
CONFIG_NET_VENDOR_REALTEK=y
CONFIG_8139CP=y

CONFIG_PCI=y
CONFIG_BLK_DEV_SD=y
CONFIG_ATA=y
CONFIG_ATA_SFF=y
CONFIG_ATA_BMDMA=y
CONFIG_PATA_PLATFORM=y

#CONFIG_SPI=y
#CONFIG_SPI_SH_SCI=y
#CONFIG_MFD_SM501=y

#CONFIG_RTC_CLASS=y
#CONFIG_RTC_DRV_R9701=y
#CONFIG_RTC_DRV_SH=y
#CONFIG_RTC_HCTOSYS=y


# CONFIG_EMBEDDED is not set
CONFIG_EARLY_PRINTK=y
CONFIG_BINFMT_ELF=y
CONFIG_BINFMT_SCRIPT=y
CONFIG_NO_HZ=y
CONFIG_HIGH_RES_TIMERS=y

CONFIG_BLK_DEV=y
CONFIG_BLK_DEV_INITRD=y
CONFIG_RD_GZIP=y

CONFIG_BLK_DEV_LOOP=y
CONFIG_EXT4_FS=y
CONFIG_EXT4_USE_FOR_EXT2=y
CONFIG_VFAT_FS=y
CONFIG_FAT_DEFAULT_UTF8=y
CONFIG_MISC_FILESYSTEMS=y
CONFIG_SQUASHFS=y
CONFIG_SQUASHFS_XATTR=y
CONFIG_SQUASHFS_ZLIB=y
CONFIG_DEVTMPFS=y
CONFIG_DEVTMPFS_MOUNT=y
CONFIG_TMPFS=y
CONFIG_TMPFS_POSIX_ACL=y

CONFIG_NET=y
CONFIG_PACKET=y
CONFIG_UNIX=y
CONFIG_INET=y
CONFIG_IPV6=y
CONFIG_NETDEVICES=y
#CONFIG_NET_CORE=y
#CONFIG_NETCONSOLE=y
CONFIG_ETHERNET=y

[unhandled content-type:application/x-shellscript]
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