linux-stable.git/arch/mips, branch linux-6.13.y

mm: hugetlb: Add huge page size param to huge_ptep_get_and_clear()

2025-03-13T12:08:07+00:00

commit 02410ac72ac3707936c07ede66e94360d0d65319 upstream.

In order to fix a bug, arm64 needs to be told the size of the huge page
for which the huge_pte is being cleared in huge_ptep_get_and_clear().
Provide for this by adding an `unsigned long sz` parameter to the
function. This follows the same pattern as huge_pte_clear() and
set_huge_pte_at().

This commit makes the required interface modifications to the core mm as
well as all arches that implement this function (arm64, loongarch, mips,
parisc, powerpc, riscv, s390, sparc). The actual arm64 bug will be fixed
in a separate commit.

Cc: stable@vger.kernel.org
Fixes: 66b3923a1a0f ("arm64: hugetlb: add support for PTE contiguous bit")
Acked-by: David Hildenbrand 
Reviewed-by: Alexandre Ghiti  # riscv
Reviewed-by: Christophe Leroy 
Reviewed-by: Catalin Marinas 
Reviewed-by: Anshuman Khandual 
Signed-off-by: Ryan Roberts 
Acked-by: Alexander Gordeev  # s390
Link: https://lore.kernel.org/r/20250226120656.2400136-2-ryan.roberts@arm.com
Signed-off-by: Will Deacon 
Signed-off-by: Greg Kroah-Hartman

MIPS: ftrace: Declare ftrace_get_parent_ra_addr() as static

2025-02-17T10:36:58+00:00

commit ddd068d81445b17ac0bed084dfeb9e58b4df3ddd upstream.

Declare ftrace_get_parent_ra_addr() as static to suppress clang
compiler warning that 'no previous prototype'. This function is
not intended to be called from other parts.

Fix follow error with clang-19:

arch/mips/kernel/ftrace.c:251:15: error: no previous prototype for function 'ftrace_get_parent_ra_addr' [-Werror,-Wmissing-prototypes]
  251 | unsigned long ftrace_get_parent_ra_addr(unsigned long self_ra, unsigned long
      |               ^
arch/mips/kernel/ftrace.c:251:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
  251 | unsigned long ftrace_get_parent_ra_addr(unsigned long self_ra, unsigned long
      | ^
      | static
1 error generated.

Signed-off-by: WangYuli 
Acked-by: Masami Hiramatsu (Google) 
Reviewed-by: Philippe Mathieu-Daudé 
Signed-off-by: Thomas Bogendoerfer 
Signed-off-by: Greg Kroah-Hartman

Revert "MIPS: csrc-r4k: Select HAVE_UNSTABLE_SCHED_CLOCK if SMP && 64BIT"

2025-02-17T10:36:32+00:00

commit 078b831638e1aa06dd7ffa9f244c8ac6b2995561 upstream.

This reverts commit 426fa8e4fe7bb914b5977cbce453a9926bf5b2e6.

The commit has caused two issues on Loongson 3A4000:

1. The timestamp in dmesg become erratic, like:

    [3.736957] amdgpu 0000:04:00.0: ... ...
    [3.748895] [drm] Initialized amdgpu ... ...
    [18446744073.381141] amdgpu 0000:04:00:0: ... ...
    [1.613326] igb 0000:03:00.0 enp3s0: ... ...

2. More seriously, some workloads (for example, the test
   stdlib/test-cxa_atexit2 in the Glibc test suite) triggers an RCU
   stall and hang the system with a high probably (4 hangs out of 5
   tests).

Revert this commit to use jiffie on Loongson MIPS systems and fix these
issues for now.  The root cause may need more investigation.

Cc: stable@vger.kernel.org # 6.11+
Cc: Jiaxun Yang 
Cc: Icenowy Zheng 
Signed-off-by: Xi Ruoyao 
Reviewed-by: Jiaxun Yang 
Signed-off-by: Thomas Bogendoerfer 
Signed-off-by: Greg Kroah-Hartman

MIPS: pci-legacy: Override pci_address_to_pio

2025-02-17T10:36:32+00:00

commit df1b8d6e89db0edd572a1e375f5d3dd5575b9a9b upstream.

pci-legacy systems are not using logic_pio to managed PIO
allocations, thus the generic pci_address_to_pio won't work
when PCI_IOBASE is defined.

Override the function to use architecture implementation to
fix the problem.

Cc: stable@vger.kernel.org
Fixes: 4bfb53e7d317 ("mips: add  including")
Reported-by: Mateusz Jończyk 
Closes: https://lore.kernel.org/r/99f75c66-4c2d-45dc-a808-b5ba440c7551@app.fastmail.com/
Signed-off-by: Jiaxun Yang 
Signed-off-by: Thomas Bogendoerfer 
Signed-off-by: Greg Kroah-Hartman

mips/math-emu: fix emulation of the prefx instruction

2025-02-17T10:36:32+00:00

commit 42a39e4aa59a10aa4afdc14194f3ee63d2db94e1 upstream.

Currently, installation of Debian 12.8 for mipsel fails on machines
without an FPU [1]. This is caused by the fact that zstd (which is used
for initramfs compression) executes the prefx instruction, which is not
emulated properly by the kernel.

The prefx (Prefetch Indexed) instruction fetches data from memory into
the cache without any side effects. Though functionally unrelated, it
requires an FPU [2].

Bytecode format of this instruction ends on "001111" binary:

	(prefx instruction format) & 0x0000003f = 0x0000000f

The code in fpux_emu() runs like so:

	#define MIPSInst(x) x
	#define MIPSInst_FMA_FFMT(x) (MIPSInst(x) & 0x00000007)
	#define MIPSInst_FUNC(x) (MIPSInst(x) & 0x0000003f)
	enum cop1x_func { ..., pfetch_op = 0x0f, ... };

	...

	switch (MIPSInst_FMA_FFMT(ir)) {
	...

	case 0x3:
		if (MIPSInst_FUNC(ir) != pfetch_op)
			return SIGILL;

		/* ignore prefx operation */
		break;

	default:
		return SIGILL;
	}

That snippet above contains a logic error and the
	if (MIPSInst_FUNC(ir) != pfetch_op)
comparison always fires.

When MIPSInst_FUNC(ir) is equal to pfetch_op, ir must end on 001111
binary. In this case, MIPSInst_FMA_FFMT(ir) must be equal to 0x7, which
does not match that case label.

This causes emulation failure for the prefx instruction. Fix it.

This has been broken by
commit 919af8b96c89 ("MIPS: Make definitions of MIPSInst_FMA_{FUNC,FMTM} consistent with MIPS64 manual")
which modified the MIPSInst_FMA_FFMT macro without updating the users.

Signed-off-by: Mateusz Jończyk 
Cc: stable@vger.kernel.org # after 3 weeks
Cc: Dengcheng Zhu 
Cc: Thomas Bogendoerfer 
Cc: Ming Wang 
Cc: Tiezhu Yang 
Fixes: 919af8b96c89 ("MIPS: Make definitions of MIPSInst_FMA_{FUNC,FMTM} consistent with MIPS64 manual")
Signed-off-by: Greg Kroah-Hartman 

[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1091858
[2] MIPS Architecture For Programmers Volume II-A: The MIPS32 Instruction Set

Signed-off-by: Thomas Bogendoerfer

MIPS: Loongson64: remove ROM Size unit in boardinfo

2025-02-17T10:36:31+00:00

commit bd2212d658d7659b9d83c7e2f3a06789d4db1e90 upstream.

Per Appendix A.7 in Q/LS 0013-2014 (龙芯CPU开发系统固件与内核接口规范 V2.2,
lit. Loongson DevSys Firmware Kernel Interface Specification V2.2),
interface_info.size is size of this interface, not size of the LEFI BIOS
ROM.

In any case, the BIOS ROM Size just cannot be several kilobytes (KB) on
Loongson64 LEFI platforms.

Reported-by: Mingcong Bai 
Suggested-by: Icenowy Zheng 
Fixes: 6c1bfbd9df8c ("MIPS: Loongson64: Add /sys/firmware/lefi/boardinfo")
Cc: stable@vger.kernel.org
Signed-off-by: Kexy Biscuit 
Acked-by: Jiaxun Yang 
Signed-off-by: Thomas Bogendoerfer 
Signed-off-by: Greg Kroah-Hartman

Get rid of 'remove_new' relic from platform driver struct

2024-12-01T23:12:43+00:00

The continual trickle of small conversion patches is grating on me, and
is really not helping.  Just get rid of the 'remove_new' member
function, which is just an alias for the plain 'remove', and had a
comment to that effect:

  /*
   * .remove_new() is a relic from a prototype conversion of .remove().
   * New drivers are supposed to implement .remove(). Once all drivers are
   * converted to not use .remove_new any more, it will be dropped.
   */

This was just a tree-wide 'sed' script that replaced '.remove_new' with
'.remove', with some care taken to turn a subsequent tab into two tabs
to make things line up.

I did do some minimal manual whitespace adjustment for places that used
spaces to line things up.

Then I just removed the old (sic) .remove_new member function, and this
is the end result.  No more unnecessary conversion noise.

Signed-off-by: Linus Torvalds

Merge tag 'kbuild-v6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

2024-11-30T21:41:50+00:00

Pull Kbuild updates from Masahiro Yamada:

 - Add generic support for built-in boot DTB files

 - Enable TAB cycling for dialog buttons in nconfig

 - Fix issues in streamline_config.pl

 - Refactor Kconfig

 - Add support for Clang's AutoFDO (Automatic Feedback-Directed
   Optimization)

 - Add support for Clang's Propeller, a profile-guided optimization.

 - Change the working directory to the external module directory for M=
   builds

 - Support building external modules in a separate output directory

 - Enable objtool for *.mod.o and additional kernel objects

 - Use lz4 instead of deprecated lz4c

 - Work around a performance issue with "git describe"

 - Refactor modpost

* tag 'kbuild-v6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (85 commits)
  kbuild: rename .tmp_vmlinux.kallsyms0.syms to .tmp_vmlinux0.syms
  gitignore: Don't ignore 'tags' directory
  kbuild: add dependency from vmlinux to resolve_btfids
  modpost: replace tdb_hash() with hash_str()
  kbuild: deb-pkg: add python3:native to build dependency
  genksyms: reduce indentation in export_symbol()
  modpost: improve error messages in device_id_check()
  modpost: rename alias symbol for MODULE_DEVICE_TABLE()
  modpost: rename variables in handle_moddevtable()
  modpost: move strstarts() to modpost.h
  modpost: convert do_usb_table() to a generic handler
  modpost: convert do_of_table() to a generic handler
  modpost: convert do_pnp_device_entry() to a generic handler
  modpost: convert do_pnp_card_entries() to a generic handler
  modpost: call module_alias_printf() from all do_*_entry() functions
  modpost: pass (struct module *) to do_*_entry() functions
  modpost: remove DEF_FIELD_ADDR_VAR() macro
  modpost: deduplicate MODULE_ALIAS() for all drivers
  modpost: introduce module_alias_printf() helper
  modpost: remove unnecessary check in do_acpi_entry()
  ...

Merge tag 'mips_6.13_1' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux

2024-11-29T18:36:01+00:00

Pull MIPS updates from Thomas Bogendoerfer:

 - fix for loongson64 device tree

 - add SPI nand to realtek device tree

 - change clock tree for mobileye

* tag 'mips_6.13_1' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux:
  MIPS: Loongson64: DTS: Really fix PCIe port nodes for ls7a
  mips: dts: realtek: Add SPI NAND controller
  MIPS: mobileye: eyeq6h: add OLB nodes OLB and remove fixed clocks
  MIPS: mobileye: eyeq5: use OLB as provider for fixed factor clocks

MIPS: Place __kernel_entry at the beginning of text section

2024-11-27T00:36:01+00:00

Mark __kernel_entry as ".head.text" and place HEAD_TEXT before
TEXT_TEXT in the linker script. This ensures that __kernel_entry
will be placed at the beginning of text section.

Drop mips from scripts/head-object-list.txt.

Signed-off-by: Rong Xu 
Reported-by: Chris Packham 
Closes: https://lore.kernel.org/lkml/c6719149-8531-4174-824e-a3caf4bc6d0e@alliedtelesis.co.nz/T/
Tested-by: Chris Packham 
Signed-off-by: Masahiro Yamada