Buildresult: powerpc-next/sh-defconfig/sh4-gcc4.6 built on May 10 2019, 02:42

kisskb

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Status:	OK
Date/Time:	May 10 2019, 02:42
Duration:	0:00:47.102962
Builder:	ka3
Revision:	powerpc/64s: Use early_mmu_has_feature() in set_kuap() (`8150a153c013aa2dd1ffae43370b89ac1347a7fb)`
Target:	powerpc-next/sh-defconfig/sh4-gcc4.6
Branch:	powerpc-next
Compiler:	sh4-gcc4.6 (sh4-linux-gcc (GCC) 4.6.3 / GNU ld (GNU Binutils) 2.22)
Config:	defconfig (download)
Log:	Download original Possible warnings (23) <stdin>:1478:2: warning: #warning syscall pidfd_send_signal not implemented [-Wcpp] <stdin>:1481:2: warning: #warning syscall io_uring_setup not implemented [-Wcpp] <stdin>:1484:2: warning: #warning syscall io_uring_enter not implemented [-Wcpp] <stdin>:1487:2: warning: #warning syscall io_uring_register 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:140:32: warning: 'levelspread[<U4a00>]' may be used uninitialized in this function [-Wuninitialized] kernel/printk/printk.c:187:16: 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] fs/ext4/readpage.c:295:1: warning: the frame size of 1200 bytes is larger than 1024 bytes [-Wframe-larger-than=] drivers/base/regmap/regmap.c:2594:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized] drivers/base/regmap/regmap.c:1855:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized] drivers/i2c/i2c-core-base.c:235:5: warning: 'ret' may be used uninitialized in this function [-Wuninitialized] mm/vmstat.c:89:5: warning: 'oldval' may be used uninitialized in this function [-Wuninitialized] fs/mpage.c:339:1: warning: the frame size of 1108 bytes is larger than 1024 bytes [-Wframe-larger-than=] fs/mpage.c:691:1: warning: the frame size of 1148 bytes is larger than 1024 bytes [-Wframe-larger-than=] 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] include/linux/skbuff.h:1397:6: warning: 'extra_uref' may be used uninitialized in this function [-Wuninitialized] mm/mprotect.c:42:20: warning: unused variable 'mm' [-Wunused-variable] include/linux/skbuff.h:1397:6: warning: 'extra_uref' may be used uninitialized in this function [-Wuninitialized] mm/hugetlb.c:1435:5: warning: 'page' may be used uninitialized in this function [-Wuninitialized] Full Log # git rev-parse -q --verify 8150a153c013aa2dd1ffae43370b89ac1347a7fb^{commit} 8150a153c013aa2dd1ffae43370b89ac1347a7fb already have revision, skipping fetch # git checkout -q -f -B kisskb 8150a153c013aa2dd1ffae43370b89ac1347a7fb # git clean -qxdf # < git log -1 # commit 8150a153c013aa2dd1ffae43370b89ac1347a7fb # Author: Michael Ellerman <mpe@ellerman.id.au> # Date: Wed May 8 13:06:42 2019 +1000 # # powerpc/64s: Use early_mmu_has_feature() in set_kuap() # # When implementing the KUAP support on Radix we fixed one case where # mmu_has_feature() was being called too early in boot via # __put_user_size(). # # However since then some new code in linux-next has created a new path # via which we can end up calling mmu_has_feature() too early. # # On P9 this leads to crashes early in boot if we have both PPC_KUAP and # CONFIG_JUMP_LABEL_FEATURE_CHECK_DEBUG enabled. Our early boot code # calls printk() which calls probe_kernel_read(), that does a # __copy_from_user_inatomic() which calls into set_kuap() and that uses # mmu_has_feature(). # # At that point in boot we haven't patched MMU features yet so the debug # code in mmu_has_feature() complains, and calls printk(). At that point # we recurse, eg: # # ... # dump_stack+0xdc # probe_kernel_read+0x1a4 # check_pointer+0x58 # ... # printk+0x40 # dump_stack_print_info+0xbc # dump_stack+0x8 # probe_kernel_read+0x1a4 # probe_kernel_read+0x19c # check_pointer+0x58 # ... # printk+0x40 # cpufeatures_process_feature+0xc8 # scan_cpufeatures_subnodes+0x380 # of_scan_flat_dt_subnodes+0xb4 # dt_cpu_ftrs_scan_callback+0x158 # of_scan_flat_dt+0xf0 # dt_cpu_ftrs_scan+0x3c # early_init_devtree+0x360 # early_setup+0x9c # # And so on for infinity, symptom is a dead system. # # Even more fun is what happens when using the hash MMU (ie. p8 or p9 # with Radix disabled), and when we don't have # CONFIG_JUMP_LABEL_FEATURE_CHECK_DEBUG enabled. With the debug disabled # we don't check if static keys have been initialised, we just rely on # the jump label. But the jump label defaults to true so we just whack # the AMR even though Radix is not enabled. # # Clearing the AMR is fine, but after we've done the user copy we write # (0b11 << 62) into AMR. When using hash that makes all pages with key # zero no longer readable or writable. All kernel pages implicitly have # key zero, and so all of a sudden the kernel can't read or write any of # its memory. Again dead system. # # In the medium term we have several options for fixing this. # probe_kernel_read() doesn't need to touch AMR at all, it's not doing a # user access after all, but it uses __copy_from_user_inatomic() just # because it's easy, we could fix that. # # It would also be safe to default to not writing to the AMR during # early boot, until we've detected features. But it's not clear that # flipping all the MMU features to static_key_false won't introduce # other bugs. # # But for now just switch to early_mmu_has_feature() in set_kuap(), that # avoids all the problems with jump labels. It adds the overhead of a # global lookup and test, but that's probably trivial compared to the # writes to the AMR anyway. # # Fixes: 890274c2dc4c ("powerpc/64s: Implement KUAP for Radix MMU") # Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> # Reviewed-by: Russell Currey <ruscur@russell.cc> # < /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 8150a153c013aa2dd1ffae43370b89ac1347a7fb # < make -s -j 80 ARCH=sh O=/kisskb/build/powerpc-next_sh-defconfig_sh4 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/sh4-linux/bin/sh4-linux- defconfig # make -s -j 80 ARCH=sh O=/kisskb/build/powerpc-next_sh-defconfig_sh4 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/sh4-linux/bin/sh4-linux- Generating include/generated/machtypes.h <stdin>:1478:2: warning: #warning syscall pidfd_send_signal not implemented [-Wcpp] <stdin>:1481:2: warning: #warning syscall io_uring_setup not implemented [-Wcpp] <stdin>:1484:2: warning: #warning syscall io_uring_enter not implemented [-Wcpp] <stdin>:1487:2: warning: #warning syscall io_uring_register 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:140:32: warning: 'levelspread[<U4a00>]' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/kernel/rcu/srcutree.c:88:6: note: 'levelspread[<U4a00>]' was declared here /kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl': /kisskb/src/kernel/printk/printk.c:187:16: 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:337:21: note: 'pdeo' was declared here /kisskb/src/fs/ext4/readpage.c: In function 'ext4_mpage_readpages': /kisskb/src/fs/ext4/readpage.c:295:1: warning: the frame size of 1200 bytes is larger than 1024 bytes [-Wframe-larger-than=] /kisskb/src/drivers/base/regmap/regmap.c: In function 'regmap_raw_read': /kisskb/src/drivers/base/regmap/regmap.c:2594:6: 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:1855:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/i2c/i2c-core-base.c: In function 'i2c_generic_scl_recovery': /kisskb/src/drivers/i2c/i2c-core-base.c:235:5: warning: 'ret' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/mm/vmstat.c: In function 'sysctl_vm_numa_stat_handler': /kisskb/src/mm/vmstat.c:89:5: warning: 'oldval' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/fs/mpage.c: In function 'do_mpage_readpage': /kisskb/src/fs/mpage.c:339:1: warning: the frame size of 1108 bytes is larger than 1024 bytes [-Wframe-larger-than=] /kisskb/src/fs/mpage.c: In function '__mpage_writepage': /kisskb/src/fs/mpage.c:691:1: warning: the frame size of 1148 bytes is larger than 1024 bytes [-Wframe-larger-than=] /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/net/ipv6/ip6_output.c: In function '__ip6_append_data.isra.12': /kisskb/src/include/linux/skbuff.h:1397:6: warning: 'extra_uref' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/net/ipv6/ip6_output.c:1276:14: note: 'extra_uref' was declared here /kisskb/src/mm/mprotect.c: In function 'change_pte_range': /kisskb/src/mm/mprotect.c:42:20: warning: unused variable 'mm' [-Wunused-variable] /kisskb/src/net/ipv4/ip_output.c: In function '__ip_append_data': /kisskb/src/include/linux/skbuff.h:1397:6: warning: 'extra_uref' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/net/ipv4/ip_output.c:885:14: note: 'extra_uref' was declared here /kisskb/src/mm/hugetlb.c: In function 'alloc_pool_huge_page': /kisskb/src/mm/hugetlb.c:1435:5: warning: 'page' may be used uninitialized in this function [-Wuninitialized] Kernel: arch/sh/boot/zImage is ready Completed OK # rm -rf /kisskb/build/powerpc-next_sh-defconfig_sh4 # Build took: 0:00:47.102962

© Michael Ellerman 2006-2018.