# git rev-parse -q --verify f8c29fc27feb230a3383204f22aa5474042f6ed8^{commit}
f8c29fc27feb230a3383204f22aa5474042f6ed8
already have revision, skipping fetch
# git checkout -q -f -B kisskb f8c29fc27feb230a3383204f22aa5474042f6ed8
# git clean -qxdf
# < git log -1
# commit f8c29fc27feb230a3383204f22aa5474042f6ed8
# Author: Michael Ellerman <mpe@ellerman.id.au>
# Date:   Mon Aug 19 22:24:01 2024 +1000
# 
#     powerpc/pseries: Fix dtl_access_lock to be a rw_semaphore
#     
#     The dtl_access_lock needs to be a rw_sempahore, a sleeping lock, because
#     the code calls kmalloc() while holding it, which can sleep:
#     
#       # echo 1 > /proc/powerpc/vcpudispatch_stats
#       BUG: sleeping function called from invalid context at include/linux/sched/mm.h:337
#       in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 199, name: sh
#       preempt_count: 1, expected: 0
#       3 locks held by sh/199:
#        #0: c00000000a0743f8 (sb_writers#3){.+.+}-{0:0}, at: vfs_write+0x324/0x438
#        #1: c0000000028c7058 (dtl_enable_mutex){+.+.}-{3:3}, at: vcpudispatch_stats_write+0xd4/0x5f4
#        #2: c0000000028c70b8 (dtl_access_lock){+.+.}-{2:2}, at: vcpudispatch_stats_write+0x220/0x5f4
#       CPU: 0 PID: 199 Comm: sh Not tainted 6.10.0-rc4 #152
#       Hardware name: IBM pSeries (emulated by qemu) POWER9 (raw) 0x4e1202 0xf000005 of:SLOF,HEAD hv:linux,kvm pSeries
#       Call Trace:
#         dump_stack_lvl+0x130/0x148 (unreliable)
#         __might_resched+0x174/0x410
#         kmem_cache_alloc_noprof+0x340/0x3d0
#         alloc_dtl_buffers+0x124/0x1ac
#         vcpudispatch_stats_write+0x2a8/0x5f4
#         proc_reg_write+0xf4/0x150
#         vfs_write+0xfc/0x438
#         ksys_write+0x88/0x148
#         system_call_exception+0x1c4/0x5a0
#         system_call_common+0xf4/0x258
#     
#     Fixes: 06220d78f24a ("powerpc/pseries: Introduce rwlock to gatekeep DTLB usage")
#     Tested-by: Kajol Jain <kjain@linux.ibm.com>
#     Reviewed-by: Nysal Jan K.A <nysal@linux.ibm.com>
#     Reviewed-by: Kajol Jain <kjain@linux.ibm.com>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://msgid.link/20240819122401.513203-1-mpe@ellerman.id.au
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/sparc64-linux/bin/sparc64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/sparc64-linux/bin/sparc64-linux-ld --version
# < git log --format=%s --max-count=1 f8c29fc27feb230a3383204f22aa5474042f6ed8
# make -s -j 40 ARCH=sparc64 O=/kisskb/build/powerpc-fixes_defconfig_sparc64-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/sparc64-linux/bin/sparc64-linux-  defconfig
# < make -s -j 40 ARCH=sparc64 O=/kisskb/build/powerpc-fixes_defconfig_sparc64-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/sparc64-linux/bin/sparc64-linux-  help
# make -s -j 40 ARCH=sparc64 O=/kisskb/build/powerpc-fixes_defconfig_sparc64-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/sparc64-linux/bin/sparc64-linux-  olddefconfig
# make -s -j 40 ARCH=sparc64 O=/kisskb/build/powerpc-fixes_defconfig_sparc64-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/sparc64-linux/bin/sparc64-linux-  
<stdin>:1519:2: warning: #warning syscall clone3 not implemented [-Wcpp]
cc1: warning: unrecognized command line option '-Wno-shift-negative-value'
cc1: warning: unrecognized command line option '-Wno-stringop-overflow'
/kisskb/src/arch/sparc/vdso/vclock_gettime.c:254:1: warning: no previous prototype for '__vdso_clock_gettime' [-Wmissing-prototypes]
 __vdso_clock_gettime(clockid_t clock, struct __kernel_old_timespec *ts)
 ^
/kisskb/src/arch/sparc/vdso/vclock_gettime.c:282:1: warning: no previous prototype for '__vdso_clock_gettime_stick' [-Wmissing-prototypes]
 __vdso_clock_gettime_stick(clockid_t clock, struct __kernel_old_timespec *ts)
 ^
/kisskb/src/arch/sparc/vdso/vclock_gettime.c:307:1: warning: no previous prototype for '__vdso_gettimeofday' [-Wmissing-prototypes]
 __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz)
 ^
/kisskb/src/arch/sparc/vdso/vclock_gettime.c:343:1: warning: no previous prototype for '__vdso_gettimeofday_stick' [-Wmissing-prototypes]
 __vdso_gettimeofday_stick(struct __kernel_old_timeval *tv, struct timezone *tz)
 ^
cc1: warning: unrecognized command line option '-Wno-shift-negative-value'
cc1: warning: unrecognized command line option '-Wno-stringop-overflow'
In file included from /kisskb/src/arch/sparc/vdso/vdso32/vclock_gettime.c:22:0:
/kisskb/src/arch/sparc/vdso/vdso32/../vclock_gettime.c:254:1: warning: no previous prototype for '__vdso_clock_gettime' [-Wmissing-prototypes]
 __vdso_clock_gettime(clockid_t clock, struct __kernel_old_timespec *ts)
 ^
/kisskb/src/arch/sparc/vdso/vdso32/../vclock_gettime.c:282:1: warning: no previous prototype for '__vdso_clock_gettime_stick' [-Wmissing-prototypes]
 __vdso_clock_gettime_stick(clockid_t clock, struct __kernel_old_timespec *ts)
 ^
/kisskb/src/arch/sparc/vdso/vdso32/../vclock_gettime.c:307:1: warning: no previous prototype for '__vdso_gettimeofday' [-Wmissing-prototypes]
 __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz)
 ^
/kisskb/src/arch/sparc/vdso/vdso32/../vclock_gettime.c:343:1: warning: no previous prototype for '__vdso_gettimeofday_stick' [-Wmissing-prototypes]
 __vdso_gettimeofday_stick(struct __kernel_old_timeval *tv, struct timezone *tz)
 ^
cc1: warning: unrecognized command line option '-Wno-shift-negative-value'
cc1: warning: unrecognized command line option '-Wno-stringop-overflow'
/kisskb/src/kernel/fork.c: In function '__do_sys_clone3':
/kisskb/src/kernel/fork.c:3072:2: warning: #warning clone3() entry point is missing, please fix [-Wcpp]
 #warning clone3() entry point is missing, please fix
  ^
/kisskb/src/kernel/fork.c: At top level:
cc1: warning: unrecognized command line option '-Wno-shift-negative-value'
cc1: warning: unrecognized command line option '-Wno-stringop-overflow'
/kisskb/src/kernel/fork.c:3072:2: warning: #warning clone3() entry point is missing, please fix [-Wcpp]
 #warning clone3() entry point is missing, please fix
  ^
cc1: warning: unrecognized command line option '-Wno-shift-negative-value'
cc1: warning: unrecognized command line option '-Wno-stringop-overflow'
WARNING: modpost: EXPORT symbol "_mcount" [vmlinux] version generation failed, symbol will not be versioned.
Is "_mcount" prototyped in <asm/asm-prototypes.h>?
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_defconfig_sparc64-gcc5
# Build took: 0:00:46.084251