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linux/arch/mips/kernel
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Paul Burton 058effe7fd MIPS: Fix detection of unsupported highmem with cache aliases 
The paging_init() function contains code which detects that highmem is
in use but unsupported due to dcache aliasing. However this code was
ineffective because it was being run before the caches are probed,
meaning that cpu_has_dc_aliases would always evaluate to false (unless a
platform overrides it to a compile-time constant) and the detection of
the unsupported case is never triggered. The kernel would then go on to
attempt to use highmem & either hit coherency issues or trigger the
BUG_ON in flush_kernel_dcache_page().

Fix this by running paging_init() later than cpu_cache_init(), such that
the cpu_has_dc_aliases macro will evaluate correctly & the unsupported
highmem case will be detected successfully.

This then leads to a formerly hidden issue in that
mem_init_free_highmem() will attempt to free all highmem pages, even
though we're avoiding use of them & don't have valid page structs for
them. This leads to an invalid pointer dereference & a TLB exception.
Avoid this by skipping the loop in mem_init_free_highmem() if
cpu_has_dc_aliases evaluates true.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: Rabin Vincent <rabinv@axis.com>
Cc: Matt Redfearn <matt.redfearn@imgtec.com>
Cc: Jerome Marchand <jmarchan@redhat.com>
Cc: Alexander Sverdlin <alexander.sverdlin@gmail.com>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: Jaedon Shin <jaedon.shin@gmail.com>
Cc: Toshi Kani <toshi.kani@hpe.com>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Sergey Ryazanov <ryazanov.s.a@gmail.com>
Cc: Jonas Gorski <jogo@openwrt.org>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/14184/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2016-09-29 18:59:49 +02:00
..
.gitignore
8250-platform.c
asm-offsets.c MIPS: KVM: Drop now unused asm offsets 2016-07-05 16:08:48 +02:00
binfmt_elfn32.c MIPS: ELF: Unify ABI classification macros 2016-05-13 15:30:25 +02:00
binfmt_elfo32.c MIPS: ELF: Unify ABI classification macros 2016-05-13 15:30:25 +02:00
bmips_5xxx_init.S MIPS: BMIPS: Make whitespacely correct. 2016-05-09 12:00:01 +02:00
bmips_vec.S MIPS: BMIPS: Add Whirlwind (BMIPS5200) initialization code 2016-05-09 12:00:01 +02:00
branch.c MIPS: inst.h: Rename cbcond{0,1}_op to pop{1,3}0_op 2016-07-05 16:09:07 +02:00
cevt-bcm1480.c MIPS: cevt-bcm1480: Migrate to new 'set-state' interface 2015-09-03 12:07:51 +02:00
cevt-ds1287.c MIPS: cevt-ds1287: Migrate to new 'set-state' interface 2015-09-03 12:07:51 +02:00
cevt-gt641xx.c MIPS: cevt-gt641xx: Migrate to new 'set-state' interface 2015-09-03 12:07:51 +02:00
cevt-r4k.c MIPS: Fix r4k clockevents registration 2016-07-24 11:59:48 +02:00
cevt-sb1250.c MIPS: cevt-sb1250: Migrate to new 'set-state' interface 2015-09-03 12:07:52 +02:00
cevt-txx9.c MIPS: cevt-txx9: Migrate to new 'set-state' interface 2015-09-03 12:07:53 +02:00
cps-vec-ns16550.S MIPS: CPS: Early debug using an ns16550-compatible UART 2015-11-11 08:34:25 +01:00
cps-vec.S MIPS: CPS: Copy EVA configuration when starting secondary VPs. 2016-05-28 12:35:05 +02:00
cpu-bugs64.c tree-wide: replace config_enabled() with IS_ENABLED() 2016-08-04 08:50:07 -04:00
cpu-probe.c MIPS: clear execution hazard after changing FTLB enable 2016-09-29 18:59:49 +02:00
crash_dump.c mips: Convert pr_warning to pr_warn 2014-11-24 07:44:51 +01:00
crash.c MIPS: Fix crash registers on non-crashing CPUs 2016-05-09 12:00:00 +02:00
csrc-bcm1480.c MIPS: csrc-bcm1480: Implement read_sched_clock 2015-04-01 17:21:27 +02:00
csrc-ioasic.c MIPS: csrc-ioasic: Implement read_sched_clock 2015-04-01 17:21:28 +02:00
csrc-r4k.c MIPS: Don't register r4k sched clock when CPUFREQ enabled 2016-07-24 12:00:15 +02:00
csrc-sb1250.c MIPS: csrc-sb1250: Implement read_sched_clock 2015-04-01 17:21:33 +02:00
early_printk_8250.c MIPS: Add 8250/16550 serial early printk driver 2013-10-29 21:24:36 +01:00
early_printk.c early_printk: consolidate random copies of identical code 2013-04-29 18:28:13 -07:00
elf.c Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2016-08-06 09:13:11 -04:00
entry.S MIPS: kernel: entry.S: Set correct ISA level for mips_ihb 2015-04-10 15:41:46 +02:00
ftrace.c Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2014-08-07 08:47:00 -07:00
genex.S MIPS: Fix BUILD_ROLLBACK_PROLOGUE for microMIPS 2016-09-29 18:59:49 +02:00
gpio_txx9.c MIPS: txx9: switch to gpiochip_add_data() 2016-02-19 09:51:44 +01:00
head.S MIPS: store the appended dtb address in a variable 2016-08-02 14:00:16 +02:00
i8253.c
idle.c MIPS: Loongson: Add Loongson-3A R2 basic support 2016-05-13 14:02:14 +02:00
irq_txx9.c MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
irq-gt641xx.c MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
irq-msc01.c MIPS: MSC: Prevent out-of-bounds writes to MIPS SC ioremap'd region 2014-06-26 10:48:23 +01:00
irq-rm7000.c MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
irq.c MIPS: Clear Status IPL field when using EIC 2016-05-28 12:35:02 +02:00
jump_label.c jump_label: Rename JUMP_LABEL_{EN,DIS}ABLE to JUMP_LABEL_{JMP,NOP} 2015-08-03 11:34:12 +02:00
kgdb.c MIPS: Get rid of 'kgdb_early_setup' cruft. 2015-06-21 21:54:10 +02:00
kprobes.c mips: Replace __get_cpu_var uses 2014-08-26 13:45:51 -04:00
linux32.c unify compat fanotify_mark(2), switch to COMPAT_SYSCALL_DEFINE 2013-05-09 13:46:38 -04:00
machine_kexec.c MIPS: kdump: Set correct value to kexec_indirection_page variable 2014-08-25 16:33:44 +02:00
Makefile MIPS: Factor o32 specific code into signal_o32.c 2016-08-02 11:02:35 +02:00
mcount.S MIPS: mcount: Adjust stack pointer for static trace in MIPS32 2014-09-26 11:41:17 +02:00
mips_ksyms.c MIPS: uaccess: Take EVA into account in [__]clear_user 2015-12-22 11:58:43 +01:00
mips_machine.c MIPS: move mips_{set,get}_machine_name() to a more generic place 2013-05-08 01:19:07 +02:00
mips-cm.c tree-wide: replace config_enabled() with IS_ENABLED() 2016-08-04 08:50:07 -04:00
mips-cpc.c MIPS: CM, CPC: Ensure core-other GCRs reflect the correct core 2015-11-11 08:35:18 +01:00
mips-mt-fpaff.c MIPS: Fix sched_getaffinity with MT FPAFF enabled 2015-08-03 09:25:02 +02:00
mips-mt.c MIPS: MT: Remove SMTC support 2014-05-24 00:07:01 +02:00
mips-r2-to-r6-emul.c MIPS: Fix pre-r6 emulation FPU initialisation 2016-09-23 18:21:38 +02:00
module-rela.c MIPS: module: fix incorrect IS_ERR_VALUE macro usages 2016-05-13 14:02:11 +02:00
module.c MIPS: module: fix incorrect IS_ERR_VALUE macro usages 2016-05-13 14:02:11 +02:00
octeon_switch.S MIPS: Fix octeon FP context switch handling 2015-10-02 19:16:06 +02:00
perf_event_mipsxx.c MIPS: perf: Fix I6400 event numbers 2016-05-17 11:05:07 +02:00
perf_event.c perf core: Add a 'nr' field to perf_event_callchain_context 2016-05-16 23:11:51 -03:00
pm-cps.c tree-wide: replace config_enabled() with IS_ENABLED() 2016-08-04 08:50:07 -04:00
pm.c MIPS: Fix watchpoint restoration 2016-05-09 12:00:02 +02:00
proc.c MIPS: Detect DSP v3 support 2016-05-13 14:01:57 +02:00
process.c MIPS: Avoid a BUG warning during prctl(PR_SET_FP_MODE, ...) 2016-09-19 16:18:05 +02:00
prom.c MIPS: Fix build with CONFIG_OF=y for non OF-enabled targets 2015-08-03 09:25:00 +02:00
ptrace32.c MIPS: Remove asm/user.h 2014-08-02 00:06:37 +02:00
ptrace.c MIPS/ptrace: run seccomp after ptrace 2016-06-14 10:54:44 -07:00
r4k_fpu.S MIPS: Use copy_s.fmt rather than copy_u.fmt 2016-05-09 12:00:04 +02:00
r4k_switch.S MIPS: Remove redundant asm/pgtable-bits.h inclusions 2016-05-13 15:30:25 +02:00
r2300_fpu.S MIPS: Avoid variant of .type unsupported by LLVM Assembler 2016-02-29 11:23:49 +01:00
r2300_switch.S MIPS: Fix R2300 FP context switch handling 2015-10-02 19:16:46 +02:00
r6000_fpu.S MIPS: Fix build with binutils 2.24.51+ 2014-11-07 15:07:36 +01:00
relocate_kernel.S MIPS: Replace add and sub instructions in relocate_kernel.S with addiu 2015-08-03 15:26:30 +02:00
relocate.c MIPS: Kernel: Implement KASLR using CONFIG_RELOCATABLE 2016-05-13 14:02:03 +02:00
reset.c MIPS: Provide fallback reboot/poweroff/halt implementations 2015-04-01 17:21:58 +02:00
rtlx-cmp.c MIPS: APRP: Fix an issue when device_create() fails. 2014-08-01 17:30:35 +02:00
rtlx-mt.c MIPS: APRP: Fix an issue when device_create() fails. 2014-08-01 17:30:35 +02:00
rtlx.c MIPS: rtlx: Remove KERN_DEBUG from pr_debug() arguments in rtlx.c 2014-11-24 07:44:04 +01:00
scall32-o32.S MIPS: scall: Handle seccomp filters which redirect syscalls 2016-05-13 14:02:00 +02:00
scall64-64.S MIPS: scall: Handle seccomp filters which redirect syscalls 2016-05-13 14:02:00 +02:00
scall64-n32.S KEYS: 64-bit MIPS needs to use compat_sys_keyctl for 32-bit userspace 2016-07-28 11:56:48 +02:00
scall64-o32.S KEYS: 64-bit MIPS needs to use compat_sys_keyctl for 32-bit userspace 2016-07-28 11:56:48 +02:00
segment.c MIPS: Print segment physical address when EU=1 2016-07-28 11:44:30 +02:00
setup.c MIPS: Fix detection of unsupported highmem with cache aliases 2016-09-29 18:59:49 +02:00
signal32.c MIPS: Factor o32 specific code into signal_o32.c 2016-08-02 11:02:35 +02:00
signal_n32.c MIPS: Initial implementation of a VDSO 2015-11-11 08:36:36 +01:00
signal_o32.c MIPS: Factor o32 specific code into signal_o32.c 2016-08-02 11:02:35 +02:00
signal-common.h MIPS: Save MSA extended context around signals 2015-09-03 12:07:59 +02:00
signal.c Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2016-08-06 09:13:11 -04:00
smp-bmips.c MIPS: SMP: Update cpu_foreign_map on CPU disable 2016-07-29 10:19:28 +02:00
smp-cmp.c MIPS: Make smp CMP, CPS and MT use the new generic IPI functions 2016-02-25 10:56:58 +01:00
smp-cps.c MIPS: smp-cps: Avoid BUG() when offlining pre-r6 CPUs 2016-09-29 18:59:49 +02:00
smp-gic.c MIPS: CM: make use of mips_cm_{lock,unlock}_other 2015-11-11 08:35:17 +01:00
smp-mt.c MIPS: Make smp CMP, CPS and MT use the new generic IPI functions 2016-02-25 10:56:58 +01:00
smp-up.c MIPS: SMP: Remove plat_smp_ops cpus_done method. 2014-05-27 11:06:42 +02:00
smp.c MIPS: SMP: Fix possibility of deadlock when bringing CPUs online 2016-09-25 01:43:52 +02:00
spinlock_test.c MIPS: Declare mips_debugfs_dir in a header 2015-10-26 09:49:42 +01:00
spram.c MIPS: Add P6600 cases to CPU switch statements 2016-05-13 14:01:52 +02:00
stacktrace.c MIPS: Add LATENCYTOP support 2015-11-11 08:36:46 +01:00
sync-r4k.c MIPS: sync-r4k: reduce skew while synchronization 2016-01-24 01:31:51 +01:00
syscall.c MIPS: kernel: syscall: Set the appropriate ISA level for MIPS R6 2015-02-17 15:37:29 +00:00
sysrq.c MIPS: Refactor dumping of TLB registers for r3k/r4k 2015-09-03 12:07:45 +02:00
time.c MIPS: MT: Remove SMTC support 2014-05-24 00:07:01 +02:00
topology.c
traps.c Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2016-08-06 09:13:11 -04:00
unaligned.c tree-wide: replace config_enabled() with IS_ENABLED() 2016-08-04 08:50:07 -04:00
uprobes.c MIPS: uprobes: fix use of uninitialised variable 2016-09-29 18:59:49 +02:00
vdso.c MIPS: vDSO: Fix Malta EVA mapping to vDSO page structs 2016-09-21 15:56:10 +02:00
vmlinux.lds.S MIPS: Reserve space for relocation table 2016-05-13 14:02:02 +02:00
vpe-cmp.c MIPS: APRP: Add VPE loader support for CMP platforms. 2014-01-22 20:19:02 +01:00
vpe-mt.c MIPS: MT: Remove SMTC support 2014-05-24 00:07:01 +02:00
vpe.c module: use a structure to encapsulate layout. 2015-12-04 22:46:25 +01:00
watch.c MIPS: Add and use watch register field definitions 2016-05-13 14:02:13 +02:00