Michael Ellerman 44a12806d0 Revert "powerpc/64: Avoid restore_math call if possible in syscall exit" ... This reverts commit bc4f65e4cf. As reported by Andreas, this commit is causing unrecoverable SLB misses in the system call exit path: Unrecoverable exception 4100 at c00000000000a1ec Oops: Unrecoverable exception, sig: 6 [#1] SMP NR_CPUS=2 PowerMac ... CPU: 0 PID: 18626 Comm: rm Not tainted 4.13.0-rc3 #1 task: c00000018335e080 task.stack: c000000139e50000 NIP: c00000000000a1ec LR: c00000000000a118 CTR: 0000000000000000 REGS: c000000139e53bb0 TRAP: 4100 Not tainted (4.13.0-rc3) MSR: 9000000000001030 <SF,HV,ME,IR,DR> CR: 24000044 XER: 20000000 SOFTE: 1 GPR00: 0000000000000000 c000000139e53e30 c000000000abb500 fffffffffffffffe GPR04: c0000001eb866298 0000000000000000 0000000000000000 c00000018335e080 GPR08: 900000000000d032 0000000000000000 0000000000000002 fffffffffffff001 GPR12: c000000139e50000 c00000000ffff000 00003fffa8c0dca0 00003fffa8c0dc88 GPR16: 0000000010000000 0000000000000001 00003fffa8c0eaa0 0000000000000000 GPR20: 00003fffa8c27528 00003fffa8c27b00 0000000000000000 0000000000000000 GPR24: 00003fffa8c0d918 00003ffff1b3efa0 00003fffa8c26d68 0000000000000000 GPR28: 00003fffa8c249e8 00003fffa8c263d0 00003fffa8c27550 00003ffff1b3ef10 NIP [c00000000000a1ec] system_call_exit+0xc0/0x21c LR [c00000000000a118] system_call+0x58/0x6c Call Trace: [c000000139e53e30] [c00000000000a118] system_call+0x58/0x6c (unreliable) Instruction dump: 64a51000 7c6300d0 f8a101a0 4bffff9c 3c000000 60000006 780007c6 64000000 60000000 7c004039 4082001c e8ed0170 <88070b78> 88c70b79 7c003214 2c200000 This is caused by us trying to load THREAD_LOAD_FP with MSR_RI=0, and taking an SLB miss on the thread struct. Reported-by: Andreas Schwab <schwab@linux-m68k.org> Diagnosed-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>		2017-08-07 21:36:56 +10:00
..
boot	powerpc/boot: Fix 64-bit boot wrapper build with non-biarch compiler	2017-07-28 19:35:46 +10:00
configs	powerpc/44x/fsp2: Add defconfig for FSP2 board	2017-05-30 14:59:51 +10:00
crypto	Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2017-05-02 15:53:46 -07:00
include	Linux v4.13-rc1	2017-07-31 20:20:29 +10:00
kernel	Revert "powerpc/64: Avoid restore_math call if possible in syscall exit"	2017-08-07 21:36:56 +10:00
kvm	Linux v4.13-rc1	2017-07-31 20:20:29 +10:00
lib	powerpc fixes for 4.13 #2	2017-07-14 15:33:15 -07:00
math-emu	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00
mm	Linux v4.13-rc1	2017-07-31 20:20:29 +10:00
net	bpf: Add jited_len to struct bpf_prog	2017-06-06 15:41:24 -04:00
oprofile	ktime: Cleanup ktime_set() usage	2016-12-25 17:21:22 +01:00
perf	powerpc/perf: Add POWER9 alternate PM_RUN_CYC and PM_RUN_INST_CMPL events	2017-07-12 12:21:49 +10:00
platforms	powerpc/83xx/mpc832x_rdb: fix of_irq_to_resource() error check	2017-08-02 19:26:52 +10:00
purgatory	kexec, x86/purgatory: Unbreak it and clean it up	2017-03-10 20:55:09 +01:00
sysdev	powerpc updates for 4.13	2017-07-07 13:55:45 -07:00
tools	powerpc/64: Tool to check head sections location sanity	2017-05-30 14:59:51 +10:00
xmon	powerpc/xmon: Add patch_instruction() support for xmon	2017-07-03 23:12:19 +10:00
Kconfig	include/linux/string.h: add the option of fortified string.h functions	2017-07-12 16:26:03 -07:00
Kconfig.debug	powerpc/xmon: Enable disassembly files (compilation changes)	2017-02-15 20:02:42 +11:00
Makefile	powerpc/Makefile: Fix ld version check with 64-bit LE-only toolchain	2017-07-26 16:41:54 +10:00
Makefile.postlink	powerpc/64: Tool to check head sections location sanity	2017-05-30 14:59:51 +10:00