# git rev-parse -q --verify 8e9ad2720cd1cf55530755362ad899f69e09fb9a^{commit}
8e9ad2720cd1cf55530755362ad899f69e09fb9a
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# git checkout -q -f -B kisskb 8e9ad2720cd1cf55530755362ad899f69e09fb9a
# git clean -qxdf
# < git log -1
# commit 8e9ad2720cd1cf55530755362ad899f69e09fb9a
# Author: Michael Ellerman <mpe@ellerman.id.au>
# Date:   Wed Feb 12 22:11:00 2020 +1100
# 
#     powerpc/xmon: Lower limits on nidump and ndump
#     
#     In xmon we have two variables that are used by the dump commands.
#     There's ndump which is the number of bytes to dump using 'd', and
#     nidump which is the number of instructions to dump using 'di'.
#     
#     ndump starts as 64 and nidump starts as 16, but both can be set by the
#     user.
#     
#     It's fairly common to be pasting addresses into xmon when trying to
#     debug something, and if you inadvertently double paste an address like
#     so:
#     
#       0:mon> di c000000002101f6c c000000002101f6c
#     
#     The second value is interpreted as the number of instructions to dump.
#     
#     Luckily it doesn't dump 13 quintrillion instructions, the value is
#     limited to MAX_DUMP (128K). But as each instruction is dumped on a
#     single line, that's still a lot of output. If you're on a slow console
#     that can take multiple minutes to print. If you were "just popping in
#     and out of xmon quickly before the RCU/hardlockup detector fires" you
#     are now having a bad day.
#     
#     Things are not as bad with 'd' because we print 16 bytes per line, so
#     it's fewer lines. But it's still quite a lot.
#     
#     So shrink the maximum for 'd' to 64K (one page), which is 4096 lines.
#     For 'di' add a new limit which is the above / 4 - because instructions
#     are 4 bytes, meaning again we can dump one page.
#     
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-gcc --version
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-ld --version
# < git log --format=%s --max-count=1 8e9ad2720cd1cf55530755362ad899f69e09fb9a
# < make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-next_44x_iss476-smp_defconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  44x/iss476-smp_defconfig

WARNING: unmet direct dependencies detected for HOTPLUG_CPU
  Depends on [n]: SMP [=y] && (PPC_PSERIES [=n] || PPC_PMAC [=n] || PPC_POWERNV [=n] || FSL_SOC_BOOKE [=n])
  Selected by [y]:
  - PM_SLEEP_SMP [=y] && SMP [=y] && (ARCH_SUSPEND_POSSIBLE [=y] || ARCH_HIBERNATION_POSSIBLE [=y]) && PM_SLEEP [=y]

WARNING: unmet direct dependencies detected for HOTPLUG_CPU
  Depends on [n]: SMP [=y] && (PPC_PSERIES [=n] || PPC_PMAC [=n] || PPC_POWERNV [=n] || FSL_SOC_BOOKE [=n])
  Selected by [y]:
  - PM_SLEEP_SMP [=y] && SMP [=y] && (ARCH_SUSPEND_POSSIBLE [=y] || ARCH_HIBERNATION_POSSIBLE [=y]) && PM_SLEEP [=y]
# make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-next_44x_iss476-smp_defconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  
/kisskb/src/fs/proc/inode.c: In function 'proc_reg_open':
/kisskb/src/include/linux/list.h:72:12: warning: 'pdeo' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/fs/proc/inode.c:338:21: note: 'pdeo' was declared here
/kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl':
/kisskb/src/kernel/printk/printk.c:204:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/block/blk-merge.c: In function 'blk_rq_map_sg':
/kisskb/src/block/blk.h:79:50: warning: 'bvprv.bv_offset' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/block/blk-merge.c:486:42: note: 'bvprv.bv_offset' was declared here
/kisskb/src/block/blk.h:82:12: warning: 'bvprv.bv_len' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/block/blk-merge.c:486:42: note: 'bvprv.bv_len' was declared here
/kisskb/src/arch/powerpc/include/asm/io.h:799:22: warning: 'bvprv.bv_page' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/block/blk-merge.c:486:42: note: 'bvprv.bv_page' was declared here
/kisskb/src/kernel/trace/trace_events.c: In function 'event_create_dir':
/kisskb/src/kernel/trace/trace_events.c:2040:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/tty/serial/8250/8250_core.c: In function 'univ8250_release_irq':
/kisskb/src/drivers/tty/serial/8250/8250_core.c:248:18: warning: 'i' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/tty/serial/8250/8250_core.c:228:19: note: 'i' was declared here
/kisskb/src/fs/ext4/extents.c: In function 'ext4_convert_unwritten_io_end_vec':
/kisskb/src/fs/ext4/extents.c:5009:23: warning: 'ret' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/fs/io_uring.c: In function '__io_sqe_files_update.isra.67':
/kisskb/src/fs/io_uring.c:5749:13: warning: 'err' may be used uninitialized in this function [-Wuninitialized]
INFO: Uncompressed kernel (size 0x6418c0) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x700000)
INFO: Uncompressed kernel (size 0x6418c0) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x700000)
Completed OK
# rm -rf /kisskb/build/powerpc-next_44x_iss476-smp_defconfig_powerpc-gcc4.6
# Build took: 0:00:51.892260