# git rev-parse -q --verify 625d3449788f85569096780592549d0340e9c0c7^{commit}
625d3449788f85569096780592549d0340e9c0c7
already have revision, skipping fetch
# git checkout -q -f -B kisskb 625d3449788f85569096780592549d0340e9c0c7
# git clean -qxdf
# < git log -1
# commit 625d3449788f85569096780592549d0340e9c0c7
# Author: Jason A. Donenfeld <Jason@zx2c4.com>
# Date:   Sun Jun 21 21:02:22 2020 -0600
# 
#     Revert "kernel/printk: add kmsg SEEK_CUR handling"
#     
#     This reverts commit 8ece3b3eb576a78d2e67ad4c3a80a39fa6708809.
#     
#     This commit broke userspace. Bash uses ESPIPE to determine whether or
#     not the file should be read using "unbuffered I/O", which means reading
#     1 byte at a time instead of 128 bytes at a time. I used to use bash to
#     read through kmsg in a really quite nasty way:
#     
#         while read -t 0.1 -r line 2>/dev/null || [[ $? -ne 142 ]]; do
#            echo "SARU $line"
#         done < /dev/kmsg
#     
#     This will show all lines that can fit into the 128 byte buffer, and skip
#     lines that don't. That's pretty awful, but at least it worked.
#     
#     With this change, bash now tries to do 1-byte reads, which means it
#     skips all the lines, which is worse than before.
#     
#     Now, I don't really care very much about this, and I'm already look for
#     a workaround. But I did just spend an hour trying to figure out why my
#     scripts were broken. Either way, it makes no difference to me personally
#     whether this is reverted, but it might be something to consider. If you
#     declare that "trying to read /dev/kmsg with bash is terminally stupid
#     anyway," I might be inclined to agree with you. But do note that bash
#     uses lseek(fd, 0, SEEK_CUR)==>ESPIPE to determine whether or not it's
#     reading from a pipe.
#     
#     Cc: Bruno Meneguele <bmeneg@redhat.com>
#     Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
#     Cc: Steven Rostedt <rostedt@goodmis.org>
#     Cc: David Laight <David.Laight@ACULAB.COM>
#     Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
#     Cc: Petr Mladek <pmladek@suse.com>
#     Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/nds32le-linux/bin/nds32le-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/nds32le-linux/bin/nds32le-linux-ld --version
# < git log --format=%s --max-count=1 625d3449788f85569096780592549d0340e9c0c7
# < make -s -j 48 ARCH=nds32 O=/kisskb/build/linus_nds32-allyesconfig_nds32le-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/nds32le-linux/bin/nds32le-linux-  allyesconfig
# < make -s -j 48 ARCH=nds32 O=/kisskb/build/linus_nds32-allyesconfig_nds32le-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/nds32le-linux/bin/nds32le-linux-  help
# make -s -j 48 ARCH=nds32 O=/kisskb/build/linus_nds32-allyesconfig_nds32le-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/nds32le-linux/bin/nds32le-linux-  olddefconfig
# make -s -j 48 ARCH=nds32 O=/kisskb/build/linus_nds32-allyesconfig_nds32le-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/nds32le-linux/bin/nds32le-linux-  
<stdin>:1511:2: warning: #warning syscall clone3 not implemented [-Wcpp]
In file included from /kisskb/src/include/linux/printk.h:7,
                 from /kisskb/src/include/linux/kernel.h:15,
                 from /kisskb/src/kernel/rcu/rcuperf.c:13:
/kisskb/src/kernel/rcu/rcuperf.c: In function 'kfree_perf_init':
/kisskb/src/include/linux/kern_levels.h:5:18: warning: format '%lu' expects argument of type 'long unsigned int', but argument 2 has type 'unsigned int' [-Wformat=]
 #define KERN_SOH "\001"  /* ASCII Start Of Header */
                  ^~~~~~
/kisskb/src/include/linux/kern_levels.h:9:20: note: in expansion of macro 'KERN_SOH'
 #define KERN_ALERT KERN_SOH "1" /* action must be taken immediately */
                    ^~~~~~~~
/kisskb/src/include/linux/printk.h:318:9: note: in expansion of macro 'KERN_ALERT'
  printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
         ^~~~~~~~~~
/kisskb/src/kernel/rcu/rcuperf.c:726:2: note: in expansion of macro 'pr_alert'
  pr_alert("kfree object size=%lu\n", kfree_mult * sizeof(struct kfree_obj));
  ^~~~~~~~
/kisskb/src/kernel/rcu/rcuperf.c:726:32: note: format string is defined here
  pr_alert("kfree object size=%lu\n", kfree_mult * sizeof(struct kfree_obj));
                              ~~^
                              %u
In file included from /kisskb/src/drivers/net/phy/mdio-cavium.c:11:
/kisskb/src/drivers/net/phy/mdio-cavium.c: In function 'cavium_mdiobus_set_mode':
/kisskb/src/drivers/net/phy/mdio-cavium.h:114:37: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
 #define oct_mdio_readq(addr)  readq((void *)addr)
                                     ^
/kisskb/src/drivers/net/phy/mdio-cavium.c:21:16: note: in expansion of macro 'oct_mdio_readq'
  smi_clk.u64 = oct_mdio_readq(p->register_base + SMI_CLK);
                ^~~~~~~~~~~~~~
/kisskb/src/drivers/net/phy/mdio-cavium.h:113:48: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
 #define oct_mdio_writeq(val, addr) writeq(val, (void *)addr)
                                                ^
/kisskb/src/drivers/net/phy/mdio-cavium.c:24:2: note: in expansion of macro 'oct_mdio_writeq'
  oct_mdio_writeq(smi_clk.u64, p->register_base + SMI_CLK);
  ^~~~~~~~~~~~~~~
/kisskb/src/drivers/net/phy/mdio-cavium.c: In function 'cavium_mdiobus_c45_addr':
/kisskb/src/drivers/net/phy/mdio-cavium.h:113:48: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
 #define oct_mdio_writeq(val, addr) writeq(val, (void *)addr)
                                                ^
/kisskb/src/drivers/net/phy/mdio-cavium.c:39:2: note: in expansion of macro 'oct_mdio_writeq'
  oct_mdio_writeq(smi_wr.u64, p->register_base + SMI_WR_DAT);
  ^~~~~~~~~~~~~~~
/kisskb/src/drivers/net/phy/mdio-cavium.h:113:48: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
 #define oct_mdio_writeq(val, addr) writeq(val, (void *)addr)
                                                ^
/kisskb/src/drivers/net/phy/mdio-cavium.c:47:2: note: in expansion of macro 'oct_mdio_writeq'
  oct_mdio_writeq(smi_cmd.u64, p->register_base + SMI_CMD);
  ^~~~~~~~~~~~~~~
/kisskb/src/drivers/net/phy/mdio-cavium.h:114:37: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
 #define oct_mdio_readq(addr)  readq((void *)addr)
                                     ^
/kisskb/src/drivers/net/phy/mdio-cavium.c:54:16: note: in expansion of macro 'oct_mdio_readq'
   smi_wr.u64 = oct_mdio_readq(p->register_base + SMI_WR_DAT);
                ^~~~~~~~~~~~~~
/kisskb/src/drivers/net/phy/mdio-cavium.c: In function 'cavium_mdiobus_read':
/kisskb/src/drivers/net/phy/mdio-cavium.h:113:48: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
 #define oct_mdio_writeq(val, addr) writeq(val, (void *)addr)
                                                ^
/kisskb/src/drivers/net/phy/mdio-cavium.c:86:2: note: in expansion of macro 'oct_mdio_writeq'
  oct_mdio_writeq(smi_cmd.u64, p->register_base + SMI_CMD);
  ^~~~~~~~~~~~~~~
/kisskb/src/drivers/net/phy/mdio-cavium.h:114:37: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
 #define oct_mdio_readq(addr)  readq((void *)addr)
                                     ^
/kisskb/src/drivers/net/phy/mdio-cavium.c:93:16: note: in expansion of macro 'oct_mdio_readq'
   smi_rd.u64 = oct_mdio_readq(p->register_base + SMI_RD_DAT);
                ^~~~~~~~~~~~~~
/kisskb/src/drivers/net/phy/mdio-cavium.c: In function 'cavium_mdiobus_write':
/kisskb/src/drivers/net/phy/mdio-cavium.h:113:48: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
 #define oct_mdio_writeq(val, addr) writeq(val, (void *)addr)
                                                ^
/kisskb/src/drivers/net/phy/mdio-cavium.c:125:2: note: in expansion of macro 'oct_mdio_writeq'
  oct_mdio_writeq(smi_wr.u64, p->register_base + SMI_WR_DAT);
  ^~~~~~~~~~~~~~~
/kisskb/src/drivers/net/phy/mdio-cavium.h:113:48: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
 #define oct_mdio_writeq(val, addr) writeq(val, (void *)addr)
                                                ^
/kisskb/src/drivers/net/phy/mdio-cavium.c:131:2: note: in expansion of macro 'oct_mdio_writeq'
  oct_mdio_writeq(smi_cmd.u64, p->register_base + SMI_CMD);
  ^~~~~~~~~~~~~~~
/kisskb/src/drivers/net/phy/mdio-cavium.h:114:37: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
 #define oct_mdio_readq(addr)  readq((void *)addr)
                                     ^
/kisskb/src/drivers/net/phy/mdio-cavium.c:138:16: note: in expansion of macro 'oct_mdio_readq'
   smi_wr.u64 = oct_mdio_readq(p->register_base + SMI_WR_DAT);
                ^~~~~~~~~~~~~~
/kisskb/src/drivers/net/phy/mdio-octeon.c: In function 'octeon_mdiobus_probe':
/kisskb/src/drivers/net/phy/mdio-octeon.c:48:3: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
   (u64)devm_ioremap(&pdev->dev, mdio_phys, regsize);
   ^
In file included from /kisskb/src/drivers/net/phy/mdio-octeon.c:14:
/kisskb/src/drivers/net/phy/mdio-cavium.h:113:48: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
 #define oct_mdio_writeq(val, addr) writeq(val, (void *)addr)
                                                ^
/kisskb/src/drivers/net/phy/mdio-octeon.c:56:2: note: in expansion of macro 'oct_mdio_writeq'
  oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
  ^~~~~~~~~~~~~~~
/kisskb/src/drivers/net/phy/mdio-cavium.h:113:48: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
 #define oct_mdio_writeq(val, addr) writeq(val, (void *)addr)
                                                ^
/kisskb/src/drivers/net/phy/mdio-octeon.c:77:2: note: in expansion of macro 'oct_mdio_writeq'
  oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
  ^~~~~~~~~~~~~~~
/kisskb/src/drivers/net/phy/mdio-octeon.c: In function 'octeon_mdiobus_remove':
/kisskb/src/drivers/net/phy/mdio-cavium.h:113:48: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
 #define oct_mdio_writeq(val, addr) writeq(val, (void *)addr)
                                                ^
/kisskb/src/drivers/net/phy/mdio-octeon.c:91:2: note: in expansion of macro 'oct_mdio_writeq'
  oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
  ^~~~~~~~~~~~~~~
/kisskb/src/drivers/input/joystick/analog.c:160:2: warning: #warning Precise timer not defined for this architecture. [-Wcpp]
 #warning Precise timer not defined for this architecture.
  ^~~~~~~
WARNING: modpost: EXPORT symbol "copy_page" [vmlinux] version generation failed, symbol will not be versioned.
WARNING: modpost: EXPORT symbol "clear_page" [vmlinux] version generation failed, symbol will not be versioned.
Completed OK
# rm -rf /kisskb/build/linus_nds32-allyesconfig_nds32le-gcc8
# Build took: 0:13:27.846465