Buildresult: linus/se7724_defconfig/sh4-gcc4.6 built on Nov 26 2019, 07:02

kisskb

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Status:	OK
Date/Time:	Nov 26 2019, 07:02
Duration:	0:00:24.636301
Builder:	ka4
Revision:	vfs: properly and reliably lock f_pos in fdget_pos() (`0be0ee71816b2b6725e2b4f32ad6726c9d729777)`
Target:	linus/se7724_defconfig/sh4-gcc4.6
Branch:	linus
Compiler:	sh4-gcc4.6 (sh4-linux-gcc (GCC) 4.6.3 / GNU ld (GNU Binutils) 2.22)
Config:	se7724_defconfig (download)
Log:	Download original Possible warnings (14) <stdin>:1511:2: warning: #warning syscall clone3 not implemented [-Wcpp] arch/sh/kernel/cpu/sh4/../sh3/../../entry-common.S:385: Warning: overflow in branch to syscall_exit_work; converted into longer instruction sequence arch/sh/kernel/cpu/sh4/../sh3/../../entry-common.S:388: Warning: overflow in branch to syscall_exit_work; converted into longer instruction sequence kernel/rcu/srcutree.c:121:34: warning: 'levelspread[<U46e0>]' may be used uninitialized in this function [-Wuninitialized] kernel/printk/printk.c:204:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized] include/linux/list.h:65:12: warning: 'pdeo' may be used uninitialized in this function [-Wuninitialized] drivers/base/regmap/regmap.c:2591:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized] drivers/base/regmap/regmap.c:1852:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized] drivers/i2c/busses/i2c-sh_mobile.c:399:26: warning: 'data' may be used uninitialized in this function [-Wuninitialized] drivers/sh/clk/cpg.c:41:2: warning: passing argument 1 of 'ioread8' discards 'const' qualifier from pointer target type [enabled by default] drivers/sh/clk/cpg.c:46:2: warning: passing argument 1 of 'ioread16' discards 'const' qualifier from pointer target type [enabled by default] drivers/sh/clk/cpg.c:51:2: warning: passing argument 1 of 'ioread32' discards 'const' qualifier from pointer target type [enabled by default] sound/soc/soc-pcm.c:1149:8: warning: unused variable 'name' [-Wunused-variable] drivers/usb/core/devio.c:625:23: warning: 'errno' may be used uninitialized in this function [-Wuninitialized] Full Log # git rev-parse -q --verify 0be0ee71816b2b6725e2b4f32ad6726c9d729777^{commit} 0be0ee71816b2b6725e2b4f32ad6726c9d729777 already have revision, skipping fetch # git checkout -q -f -B kisskb 0be0ee71816b2b6725e2b4f32ad6726c9d729777 # git clean -qxdf # < git log -1 # commit 0be0ee71816b2b6725e2b4f32ad6726c9d729777 # Author: Linus Torvalds <torvalds@linux-foundation.org> # Date: Mon Nov 11 15:51:03 2019 -0800 # # vfs: properly and reliably lock f_pos in fdget_pos() # # fdget_pos() is used by file operations that will read and update f_pos: # things like "read()", "write()" and "lseek()" (but not, for example, # "pread()/pwrite" that get their file positions elsewhere). # # However, it had two separate escape clauses for this, because not # everybody wants or needs serialization of the file position. # # The first and most obvious case is the "file descriptor doesn't have a # position at all", ie a stream-like file. Except we didn't actually use # FMODE_STREAM, but instead used FMODE_ATOMIC_POS. The reason for that # was that FMODE_STREAM didn't exist back in the days, but also that we # didn't want to mark all the special cases, so we only marked the ones # that _required_ position atomicity according to POSIX - regular files # and directories. # # The case one was intentionally lazy, but now that we _do_ have # FMODE_STREAM we could and should just use it. With the change to use # FMODE_STREAM, there are no remaining uses for FMODE_ATOMIC_POS, and all # the code to set it is deleted. # # Any cases where we don't want the serialization because the driver (or # subsystem) doesn't use the file position should just be updated to do # "stream_open()". We've done that for all the obvious and common # situations, we may need a few more. Quoting Kirill Smelkov in the # original FMODE_STREAM thread (see link below for full email): # # "And I appreciate if people could help at least somehow with "getting # rid of mixed case entirely" (i.e. always lock f_pos_lock on # !FMODE_STREAM), because this transition starts to diverge from my # particular use-case too far. To me it makes sense to do that # transition as follows: # # - convert nonseekable_open -> stream_open via stream_open.cocci; # - audit other nonseekable_open calls and convert left users that # truly don't depend on position to stream_open; # - extend stream_open.cocci to analyze alloc_file_pseudo as well (this # will cover pipes and sockets), or maybe convert pipes and sockets # to FMODE_STREAM manually; # - extend stream_open.cocci to analyze file_operations that use # no_llseek or noop_llseek, but do not use nonseekable_open or # alloc_file_pseudo. This might find files that have stream semantic # but are opened differently; # - extend stream_open.cocci to analyze file_operations whose # .read/.write do not use ppos at all (independently of how file was # opened); # - ... # - after that remove FMODE_ATOMIC_POS and always take f_pos_lock if # !FMODE_STREAM; # - gather bug reports for deadlocked read/write and convert missed # cases to FMODE_STREAM, probably extending stream_open.cocci along # the road to catch similar cases # # i.e. always take f_pos_lock unless a file is explicitly marked as # being stream, and try to find and cover all files that are streams" # # We have not done the "extend stream_open.cocci to analyze # alloc_file_pseudo" as well, but the previous commit did manually handle # the case of pipes and sockets. # # The other case where we can avoid locking f_pos is the "this file # descriptor only has a single user and it is us, and thus there is no # need to lock it". # # The second test was correct, although a bit subtle and worth just # re-iterating here. There are two kinds of other sources of references # to the same file descriptor: file descriptors that have been explicitly # shared across fork() or with dup(), and file tables having elevated # reference counts due to threading (or explicit file sharing with # clone()). # # The first case would have incremented the file count explicitly, and in # the second case the previous __fdget() would have incremented it for us # and set the FDPUT_FPUT flag. # # But in both cases the file count would be greater than one, so the # "file_count(file) > 1" test catches both situations. Also note that if # file_count is 1, that also means that no other thread can have access to # the file table, so there also cannot be races with concurrent calls to # dup()/fork()/clone() that would increment the file count any other way. # # Link: https://lore.kernel.org/linux-fsdevel/20190413184404.GA13490@deco.navytux.spb.ru # Cc: Kirill Smelkov <kirr@nexedi.com> # Cc: Eic Dumazet <edumazet@google.com> # Cc: Al Viro <viro@zeniv.linux.org.uk> # Cc: Alan Stern <stern@rowland.harvard.edu> # Cc: Marco Elver <elver@google.com> # Cc: Andrea Parri <parri.andrea@gmail.com> # Cc: Paul McKenney <paulmck@kernel.org> # Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> # < /opt/cross/kisskb/gcc-4.6.3-nolibc/sh4-linux/bin/sh4-linux-gcc --version # < /opt/cross/kisskb/gcc-4.6.3-nolibc/sh4-linux/bin/sh4-linux-ld --version # < git log --format=%s --max-count=1 0be0ee71816b2b6725e2b4f32ad6726c9d729777 # < make -s -j 120 ARCH=sh O=/kisskb/build/linus_se7724_defconfig_sh4 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/sh4-linux/bin/sh4-linux- se7724_defconfig # make -s -j 120 ARCH=sh O=/kisskb/build/linus_se7724_defconfig_sh4 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/sh4-linux/bin/sh4-linux- Generating include/generated/machtypes.h <stdin>:1511:2: warning: #warning syscall clone3 not implemented [-Wcpp] /kisskb/src/arch/sh/kernel/cpu/sh4/../sh3/../../entry-common.S: Assembler messages: /kisskb/src/arch/sh/kernel/cpu/sh4/../sh3/../../entry-common.S:385: Warning: overflow in branch to syscall_exit_work; converted into longer instruction sequence /kisskb/src/arch/sh/kernel/cpu/sh4/../sh3/../../entry-common.S:388: Warning: overflow in branch to syscall_exit_work; converted into longer instruction sequence /kisskb/src/kernel/rcu/srcutree.c: In function 'init_srcu_struct_fields': /kisskb/src/kernel/rcu/srcutree.c:121:34: warning: 'levelspread[<U46e0>]' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/kernel/rcu/srcutree.c:88:6: note: 'levelspread[<U46e0>]' 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/fs/proc/inode.c: In function 'proc_reg_open': /kisskb/src/include/linux/list.h:65:12: 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/drivers/base/regmap/regmap.c: In function 'regmap_raw_read': /kisskb/src/drivers/base/regmap/regmap.c:2591:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/base/regmap/regmap.c: In function '_regmap_raw_write': /kisskb/src/drivers/base/regmap/regmap.c:1852:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/i2c/busses/i2c-sh_mobile.c: In function 'sh_mobile_i2c_isr': /kisskb/src/drivers/i2c/busses/i2c-sh_mobile.c:399:26: warning: 'data' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/i2c/busses/i2c-sh_mobile.c:372:16: note: 'data' was declared here /kisskb/src/drivers/sh/clk/cpg.c: In function 'r8': /kisskb/src/drivers/sh/clk/cpg.c:41:2: warning: passing argument 1 of 'ioread8' discards 'const' qualifier from pointer target type [enabled by default] /kisskb/src/include/asm-generic/iomap.h:29:21: note: expected 'void ' but argument is of type 'const void ' /kisskb/src/drivers/sh/clk/cpg.c: In function 'r16': /kisskb/src/drivers/sh/clk/cpg.c:46:2: warning: passing argument 1 of 'ioread16' discards 'const' qualifier from pointer target type [enabled by default] /kisskb/src/include/asm-generic/iomap.h:30:21: note: expected 'void ' but argument is of type 'const void ' /kisskb/src/drivers/sh/clk/cpg.c: In function 'r32': /kisskb/src/drivers/sh/clk/cpg.c:51:2: warning: passing argument 1 of 'ioread32' discards 'const' qualifier from pointer target type [enabled by default] /kisskb/src/include/asm-generic/iomap.h:32:21: note: expected 'void ' but argument is of type 'const void ' /kisskb/src/sound/soc/soc-pcm.c: In function 'dpcm_be_connect': /kisskb/src/sound/soc/soc-pcm.c:1149:8: warning: unused variable 'name' [-Wunused-variable] /kisskb/src/drivers/usb/core/devio.c: In function 'async_completed': /kisskb/src/drivers/usb/core/devio.c:625:23: warning: 'errno' may be used uninitialized in this function [-Wuninitialized] Image Name: Linux-5.4.0+ Created: Tue Nov 26 07:02:57 2019 Image Type: SuperH Linux Kernel Image (gzip compressed) Data Size: 3387381 Bytes = 3307.99 KiB = 3.23 MiB Load Address: 88001000 Entry Point: 88002000 Image arch/sh/boot/uImage is ready Completed OK # rm -rf /kisskb/build/linus_se7724_defconfig_sh4 # Build took: 0:00:24.636301

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