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linux/arch/mips/kernel
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Serge Semin 0cc5981ea8 mips: Fix incorrect max_low_pfn adjustment 
[ Upstream commit 0f5cc249ff ]

max_low_pfn variable is incorrectly adjusted if the kernel is built with
high memory support and the later is detected in a running system, so the
memory which actually can be directly mapped is getting into the highmem
zone. See the ZONE_NORMAL range on my MIPS32r5 system:

> Zone ranges:
>   DMA      [mem 0x0000000000000000-0x0000000000ffffff]
>   Normal   [mem 0x0000000001000000-0x0000000007ffffff]
>   HighMem  [mem 0x0000000008000000-0x000000020fffffff]

while the zones are supposed to look as follows:

> Zone ranges:
>   DMA      [mem 0x0000000000000000-0x0000000000ffffff]
>   Normal   [mem 0x0000000001000000-0x000000001fffffff]
>   HighMem  [mem 0x0000000020000000-0x000000020fffffff]

Even though the physical memory within the range [0x08000000;0x20000000]
belongs to MMIO on our system, we don't really want it to be considered as
high memory since on MIPS32 that range still can be directly mapped.

Note there might be other problems caused by the max_low_pfn variable
misconfiguration. For instance high_memory variable is initialize with
virtual address corresponding to the max_low_pfn PFN, and by design it
must define the upper bound on direct map memory, then end of the normal
zone. That in its turn potentially may cause problems in accessing the
memory by means of the /dev/mem and /dev/kmem devices.

Let's fix the discovered misconfiguration then. It turns out the commit
a94e4f24ec ("MIPS: init: Drop boot_mem_map") didn't introduce the
max_low_pfn adjustment quite correct. If the kernel is built with high
memory support and the system is equipped with high memory, the
max_low_pfn variable will need to be initialized with PFN of the most
upper directly reachable memory address so the zone normal would be
correctly setup. On MIPS that PFN corresponds to PFN_DOWN(HIGHMEM_START).
If the system is built with no high memory support and one is detected in
the running system, we'll just need to adjust the max_pfn variable to
discard the found high memory from the system and leave the max_low_pfn as
is, since the later will be less than PFN_DOWN(HIGHMEM_START) anyway by
design of the for_each_memblock() loop performed a bit early in the
bootmem_init() method.

Fixes: a94e4f24ec ("MIPS: init: Drop boot_mem_map")
Signed-off-by: Serge Semin <fancer.lancer@gmail.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2024-01-25 15:45:19 -08:00
..
syscalls asm-generic updates for v6.7 2023-11-01 15:28:33 -10:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
access-helper.h MIPS: Fix new sparse warnings 2021-04-07 16:11:05 +02:00
asm-offsets.c mips: asm-offsets: add missing prototypes 2023-06-09 10:18:42 +02:00
bmips_5xxx_init.S MIPS: BCM5xxx: Remove dead init_fpu code 2018-11-08 11:20:57 -08:00
bmips_vec.S MIPS: BMIPS: Add Whirlwind (BMIPS5200) initialization code 2016-05-09 12:00:01 +02:00
branch.c MIPS: kernel: include probes-common.h header in branch.c 2020-09-21 22:14:24 +02:00
cacheinfo.c drivers: base: cacheinfo: Get rid of DEFINE_SMP_CALL_CACHE_FUNCTION() 2021-09-01 10:29:10 +02:00
cevt-bcm1480.c MIPS: Replace setup_irq() by request_irq() 2020-03-05 16:47:35 +01:00
cevt-ds1287.c MIPS: Replace setup_irq() by request_irq() 2020-03-05 16:47:35 +01:00
cevt-gt641xx.c MIPS: Replace setup_irq() by request_irq() 2020-03-05 16:47:35 +01:00
cevt-r4k.c MIPS: cevt-r4k: Offset the value used to clear compare interrupt 2023-02-27 23:45:17 +01:00
cevt-sb1250.c MIPS: Replace setup_irq() by request_irq() 2020-03-05 16:47:35 +01:00
cevt-txx9.c mips: kernel: convert comma to semicolon 2020-12-28 22:32:28 +01:00
cmpxchg.c MIPS: fix typos in comments 2022-05-04 22:22:59 +02:00
cps-vec-ns16550.S mips: Add CPS_NS16550_WIDTH config 2020-05-22 09:12:52 +02:00
cps-vec.S MIPS: smp-cps: Disable coherence setup for unsupported ISA 2023-04-05 09:45:08 +02:00
cpu-probe.c MIPS: Loongson: Fix cpu_probe_loongson() again 2023-07-03 16:05:51 +02:00
cpu-r3k-probe.c MIPS: Remove TX39XX support 2022-03-01 10:07:22 +01:00
crash.c mm: remove include/linux/bootmem.h 2018-10-31 08:54:16 -07:00
crash_dump.c vmcore: convert copy_oldmem_page() to take an iov_iter 2022-04-29 14:37:59 -07:00
csrc-bcm1480.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
csrc-ioasic.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
csrc-r4k.c mips: csrc-r4k: Mark R4K timer as unstable if CPU freq changes 2020-05-22 09:14:06 +02:00
csrc-sb1250.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
early_printk.c mips: unify prom_putchar() declarations 2018-07-17 09:40:17 -07:00
early_printk_8250.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 1 2019-05-21 11:28:39 +02:00
elf.c MIPS: Modernize READ_IMPLIES_EXEC 2022-02-23 13:08:30 +01:00
entry.S MIPS: Remove TX39XX support 2022-03-01 10:07:22 +01:00
fpu-probe.c MIPS: cpu-probe: move fpu probing/handling into its own file 2020-10-12 12:04:50 +02:00
fpu-probe.h MIPS: cpu-probe: move fpu probing/handling into its own file 2020-10-12 12:04:50 +02:00
ftrace.c MIPS: kernel: Remove not needed set_fs calls 2021-04-06 14:36:56 +02:00
genex.S MIPS: Always use -Wa,-msoft-float and eliminate GAS_HAS_SET_HARDFLOAT 2023-01-26 12:41:16 +09:00
gpio_txx9.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
head.S MIPS: of: Introduce helper function to get DTB 2021-02-04 13:34:51 +01:00
i8253.c MIPS: Replace setup_irq() by request_irq() 2020-03-05 16:47:35 +01:00
idle.c cpuidle,arch: Mark all regular cpuidle_state:: Enter methods __cpuidle 2023-01-13 11:48:18 +01:00
irq-gt641xx.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 1 2019-05-21 11:28:39 +02:00
irq-msc01.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
irq.c MIPS: Only use current_stack_pointer on GCC 2022-03-14 15:02:53 +01:00
irq_txx9.c MIPS: Remove TX39XX support 2022-03-01 10:07:22 +01:00
jump_label.c MIPS: jump_label: Fix compat branch range check 2022-11-11 15:46:03 +01:00
kgdb.c MIPS: kernel: Drop kgdb_call_nmi_hook 2021-02-15 12:23:54 +01:00
kprobes.c MIPS: Use NOKPROBE_SYMBOL() instead of __kprobes annotation 2022-05-12 18:00:51 +02:00
linux32.c MIPS: Delete unused code in linux32.c 2018-08-01 13:20:27 -07:00
machine_kexec.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 230 2019-06-19 17:09:06 +02:00
Makefile mips, kexec: fix the incorrect ifdeffery and dependency of CONFIG_KEXEC 2023-12-12 17:20:18 -08:00
mcount.S mips: replace #include <asm/export.h> with #include <linux/export.h> 2023-08-15 10:22:23 +02:00
mips-cm.c MIPS: mips-cm: Check availability of config registers 2023-04-05 09:45:08 +02:00
mips-cpc.c mips: cpc: Fix refcount leak in mips_cpc_default_phys_base 2022-04-26 15:11:25 +02:00
mips-mt-fpaff.c MIPS: Replace deprecated CPU-hotplug functions. 2021-08-05 10:57:01 +02:00
mips-mt.c driver core: class: remove module * from class_create() 2023-03-17 15:16:33 +01:00
mips-r2-to-r6-emul.c MIPS: Fix build error due to PTR used in more places 2022-01-27 09:04:19 +01:00
module.c jump_label: mips: move module NOP patching into arch code 2022-06-24 09:48:55 +02:00
octeon_switch.S mips: remove unneeded #include <asm/export.h> 2023-08-15 10:22:23 +02:00
perf_event.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
perf_event_mipsxx.c MIPS: fix typos in comments 2022-05-04 22:22:59 +02:00
perf_regs.c MIPS: kernel: Support extracting off-line stack traces from user-space with perf 2021-02-04 21:55:45 +01:00
pm-cps.c MIPS: barrier: Add __SYNC() infrastructure 2019-10-07 09:42:17 -07:00
pm.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
probes-common.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
proc.c MIPS: cpuinfo: Fix a warning for CONFIG_CPUMASK_OFFSTACK 2022-07-14 11:49:40 +02:00
process.c MIPS: kernel: Clear FPU states when setting up kernel threads 2023-12-05 18:47:11 +01:00
prom.c MIPS: move from strlcpy with unused retval to strscpy 2022-09-12 15:34:04 +02:00
ptrace.c mips: ptrace: user_regset_copyin_ignore() always returns 0 2022-11-15 14:30:40 -08:00
ptrace32.c mm: don't include asm/pgtable.h if linux/mm.h is already included 2020-06-09 09:39:13 -07:00
r4k-bugs64.c MIPS: remove asm/war.h 2022-02-22 09:35:49 +01:00
r4k_fpu.S mips: replace #include <asm/export.h> with #include <linux/export.h> 2023-08-15 10:22:23 +02:00
r4k_switch.S Kbuild: rename CC_STACKPROTECTOR[_STRONG] config variables 2018-06-14 12:21:18 +09:00
r2300_fpu.S mips: replace #include <asm/export.h> with #include <linux/export.h> 2023-08-15 10:22:23 +02:00
r2300_switch.S mips: remove unneeded #include <asm/export.h> 2023-08-15 10:22:23 +02:00
relocate.c MIPS: move from strlcpy with unused retval to strscpy 2022-09-12 15:34:04 +02:00
relocate_kernel.S MIPS: Remove dead code in relocate_new_kernel 2023-10-06 10:13:51 +02:00
reset.c mips: Use do_kernel_power_off() 2022-05-19 19:30:31 +02:00
rtlx-mt.c MIPS: Replace setup_irq() by request_irq() 2020-03-05 16:47:35 +01:00
rtlx.c vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
scall32-o32.S MIPS: remove asm/war.h 2022-02-22 09:35:49 +01:00
scall64-n32.S MIPS: Fix build error due to PTR used in more places 2022-01-27 09:04:19 +01:00
scall64-n64.S MIPS: remove asm/war.h 2022-02-22 09:35:49 +01:00
scall64-o32.S MIPS: Fix build error due to PTR used in more places 2022-01-27 09:04:19 +01:00
segment.c mips: kernel: convert to DEFINE_SHOW_ATTRIBUTE 2022-09-19 16:40:17 +02:00
setup.c mips: Fix incorrect max_low_pfn adjustment 2024-01-25 15:45:19 -08:00
signal-common.h MIPS: Save MSA extended context around signals 2015-09-03 12:07:59 +02:00
signal.c ptrace: Cleanups for v5.18 2022-03-28 17:29:53 -07:00
signal32.c Remove 'type' argument from access_ok() function 2019-01-03 18:57:57 -08:00
signal_n32.c MIPS: remove asm/war.h 2022-02-22 09:35:49 +01:00
signal_o32.c signal: Remove task parameter from force_sig 2019-05-27 09:36:28 -05:00
smp-bmips.c mips, kexec: fix the incorrect ifdeffery and dependency of CONFIG_KEXEC 2023-12-12 17:20:18 -08:00
smp-cps.c mips, kexec: fix the incorrect ifdeffery and dependency of CONFIG_KEXEC 2023-12-12 17:20:18 -08:00
smp-mt.c MIPS: Rework smt cmdline parameters 2023-06-09 10:34:14 +02:00
smp-up.c MIPS: SMP: Allow boot_secondary SMP op to return errors 2017-08-30 00:57:27 +02:00
smp.c mips/smp: Call rcutree_report_cpu_starting() earlier 2023-12-05 18:43:05 +01:00
spinlock_test.c mips: kernel: use DEFINE_DEBUGFS_ATTRIBUTE with debugfs_create_file_unsafe() 2021-03-14 14:09:49 +01:00
spram.c mips: Add CONFIG/CONFIG6/Cause reg fields macro 2020-05-22 09:12:22 +02:00
stacktrace.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
sync-r4k.c MIPS: sync-r4k: do slave counter synchronization with disabled HW interrupts 2020-01-22 10:16:18 -08:00
syscall.c MIPS: Fix build error due to PTR used in more places 2022-01-27 09:04:19 +01:00
sysrq.c tty: sysrq: switch sysrq handlers from int to u8 2023-07-25 19:21:03 +02:00
time.c MIPS: Fix CP0 counter erratum detection for R4k CPUs 2022-04-29 15:52:00 +02:00
topology.c drivers/base/node: consolidate node device subsystem initialization in node_dev_init() 2022-03-22 15:57:10 -07:00
traps.c MIPS: fix fortify panic when copying asm exception handlers 2022-03-07 13:09:28 +01:00
unaligned.c MIPS: uaccess: emulate Ingenic LXW/LXH/LXHU uaccess 2023-06-09 09:54:17 +02:00
uprobes.c MIPS: uprobes: Restore thread.trap_nr 2023-04-24 13:31:44 +02:00
vdso.c treewide: use get_random_u32_below() instead of deprecated function 2022-11-18 02:15:15 +01:00
vmlinux.lds.S MIPS: Define RUNTIME_DISCARD_EXIT in LD script 2023-04-21 23:59:43 +02:00
vpe-mt.c drivers: remove struct module * setting from struct class 2023-03-17 15:16:27 +01:00
vpe.c - added support for Huawei B593u-12 2023-04-27 17:46:52 -07:00
watch.c MIPS: Use fallthrough for arch/mips 2020-05-07 11:55:47 +02:00