kernel/linux.git/drivers/acpi/sysfs.c, branch v7.0-rc7

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-22T01:09:51+00:00

This was done entirely with mindless brute force, using git grep -l '\

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21T09:02:28+00:00

This is the result of running the Coccinelle script from scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to avoid scalar types (which need careful case-by-case checking), and instead replace kmalloc-family calls that allocate struct or union object instances: Single allocations: kmalloc(sizeof(TYPE), ...) are replaced with: kmalloc_obj(TYPE, ...) Array allocations: kmalloc_array(COUNT, sizeof(TYPE), ...) are replaced with: kmalloc_objs(TYPE, COUNT, ...) Flex array allocations: kmalloc(struct_size(PTR, FAM, COUNT), ...) are replaced with: kmalloc_flex(*PTR, FAM, COUNT, ...) (where TYPE may also be *VAR) The resulting allocations no longer return "void *", instead returning "TYPE *". Signed-off-by: Kees Cook

ACPI: sysfs: Replace sprintf() with sysfs_emit()

2026-01-27T20:58:58+00:00

Replace all sprintf() calls with sysfs_emit() in sysfs show functions. sysfs_emit() is preferred to sprintf() for formatting sysfs output as it provides better bounds checking and prevents potential buffer overflows. Signed-off-by: Sumeet Pawnikar [ rjw: Subject and changelog edits ] Link: https://patch.msgid.link/20260126093949.8910-1-sumeet4linux@gmail.com Signed-off-by: Rafael J. Wysocki

sysfs: treewide: switch back to bin_attribute::read()/write()

2025-06-17T08:44:13+00:00

The bin_attribute argument of bin_attribute::read() is now const. This makes the _new() callbacks unnecessary. Switch all users back. Signed-off-by: Thomas Weißschuh Link: https://lore.kernel.org/r/20250530-sysfs-const-bin_attr-final-v3-3-724bfcf05b99@weissschuh.net Signed-off-by: Greg Kroah-Hartman

ACPI: sysfs: Constify 'struct bin_attribute'

2024-12-10T18:34:41+00:00

The sysfs core now allows instances of 'struct bin_attribute' to be moved into read-only memory. Make use of that to protect them against accidental or malicious modifications. Signed-off-by: Thomas Weißschuh Link: https://patch.msgid.link/20241202-sysfs-const-bin_attr-acpi-v1-3-78f3b38d350d@weissschuh.net Signed-off-by: Rafael J. Wysocki

ACPI: sysfs: Enable ACPI sysfs support for CCEL records

2023-03-27T18:43:58+00:00

The Confidential Computing Event Log (CCEL) table provides the address and length of the CCEL records area in UEFI reserved memory. To allow user space access to these records, expose a sysfs interface similar to the BERT table. More details about the CCEL table can be found in the ACPI specification r6.5 [1], sec 5.2.34. Link: https://uefi.org/specs/ACPI/6.5/05_ACPI_Software_Programming_Model.html#cc-event-log-acpi-table # [1] Co-developed-by: Haibo Xu Signed-off-by: Haibo Xu Signed-off-by: Kuppuswamy Sathyanarayanan Signed-off-by: Rafael J. Wysocki

ACPI: make kobj_type structures constant

2023-02-14T14:52:37+00:00

Since commit ee6d3dd4ed48 ("driver core: make kobj_type constant.") the driver core allows the usage of const struct kobj_type. Take advantage of this to constify the structure definitions to prevent modification at runtime. Signed-off-by: Thomas Weißschuh Signed-off-by: Rafael J. Wysocki

ACPI: sysfs: use sysfs_emit() to instead of scnprintf()

2022-11-10T19:24:49+00:00

Replace scnprintf() with sysfs_emit() to simplify the code. Reported-by: Zeal Robot Signed-off-by: Xu Panda Signed-off-by: Yang Yang Signed-off-by: Rafael J. Wysocki

ACPI: sysfs: Use kstrtobool() instead of strtobool()

2022-11-03T18:46:54+00:00

strtobool() is the same as kstrtobool(). However, the latter is more used within the kernel. In order to remove strtobool() and slightly simplify kstrtox.h, switch to the other function name. While at it, include the corresponding header file () Signed-off-by: Christophe JAILLET Reviewed-by: Andy Shevchenko Signed-off-by: Rafael J. Wysocki

ACPI: sysfs: Fix BERT error region memory mapping

2022-04-13T17:58:14+00:00

Currently the sysfs interface maps the BERT error region as "memory" (through acpi_os_map_memory()) in order to copy the error records into memory buffers through memory operations (eg memory_read_from_buffer()). The OS system cannot detect whether the BERT error region is part of system RAM or it is "device memory" (eg BMC memory) and therefore it cannot detect which memory attributes the bus to memory support (and corresponding kernel mapping, unless firmware provides the required information). The acpi_os_map_memory() arch backend implementation determines the mapping attributes. On arm64, if the BERT error region is not present in the EFI memory map, the error region is mapped as device-nGnRnE; this triggers alignment faults since memcpy unaligned accesses are not allowed in device-nGnRnE regions. The ACPI sysfs code cannot therefore map by default the BERT error region with memory semantics but should use a safer default. Change the sysfs code to map the BERT error region as MMIO (through acpi_os_map_iomem()) and use the memcpy_fromio() interface to read the error region into the kernel buffer. Link: https://lore.kernel.org/linux-arm-kernel/31ffe8fc-f5ee-2858-26c5-0fd8bdd68702@arm.com Link: https://lore.kernel.org/linux-acpi/CAJZ5v0g+OVbhuUUDrLUCfX_mVqY_e8ubgLTU98=jfjTeb4t+Pw@mail.gmail.com Signed-off-by: Lorenzo Pieralisi Tested-by: Veronika Kabatova Tested-by: Aristeu Rozanski Acked-by: Ard Biesheuvel Signed-off-by: Rafael J. Wysocki