kernel/git/stable/linux.git/drivers/acpi/nvs.c, branch master

ACPI: NVS: replace __get_free_page() with kmalloc()

2026-07-21T12:23:24+00:00

suspend_nvs_alloc() allocates shadow pages for saving and restoring ACPI Non-Volatile Storage regions across suspend/resume. These buffers can be allocated with kmalloc() as there's nothing special about them to go directly to the page allocator. kmalloc() provides a better API that does not require ugly casts and kfree() does not need to know the size of the freed object. Performance difference between kmalloc() and __get_free_pages() is not measurable as both allocators take an object/page from a per-CPU list for fast path allocations. For the slow path the performance is anyway determined by the amount of reclaim involved rather than by what allocator is used. Replace use of __get_free_page() with kmalloc() and free_page() with kfree(). Link: https://lore.kernel.org/all/635405e4-9423-4a25-a6e7-e03c8ea0bcbe@redhat.com Signed-off-by: Mike Rapoport (Microsoft) Link: https://patch.msgid.link/20260630-b4-acpi-v1-1-a9f59c04d221@kernel.org Signed-off-by: Rafael J. Wysocki

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

Merge branches 'acpi-ec', 'acpi-apei', 'acpi-soc' and 'acpi-misc'

2021-06-29T13:51:25+00:00

* acpi-ec: ACPI: EC: trust DSDT GPE for certain HP laptop ACPI: EC: Make more Asus laptops use ECDT _GPE * acpi-apei: ACPI: APEI: fix synchronous external aborts in user-mode ACPI: APEI: Don't warn if ACPI is disabled * acpi-soc: ACPI: LPSS: Use kstrtol() instead of simple_strtol() * acpi-misc: ACPI: NVS: fix doc warnings in nvs.c ACPI: NUMA: fix typo in a comment ACPI: OSL: Use DEFINE_RES_IO_NAMED() to simplify code ACPI: bus: Call kobject_put() in acpi_init() error path ACPI: bus: Remove unneeded assignment ACPI: configfs: Replace ACPI_INFO() with pr_debug() ACPI: ipmi: Remove address space handler in error path ACPI: event: Remove redundant initialization of local variable ACPI: sbshc: Fix fall-through warning for Clang

ACPI: NVS: fix doc warnings in nvs.c

2021-06-17T12:36:32+00:00

Fixes the following W=1 kernel build warning(s): drivers/acpi/nvs.c:94: warning: Function parameter or member 'start' not described in 'suspend_nvs_register' drivers/acpi/nvs.c:94: warning: Function parameter or member 'size' not described in 'suspend_nvs_register' Signed-off-by: Baokun Li [ rjw: Subject edits ] Signed-off-by: Rafael J. Wysocki

ACPI: nvs: Unify the message printing

2021-06-07T13:36:45+00:00

The message printing in nvs.c is mixed with pr_*() and printk(), but with no prefix and also no pr_fmt() defined. Introduce pr_fmt() and use pr_*() macros to replace printk(), to generate a unified format string for prefix. Signed-off-by: Hanjun Guo Signed-off-by: Rafael J. Wysocki

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428

2019-06-05T15:37:16+00:00

Based on 1 normalized pattern(s): this file is released under the gplv2 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 68 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Armijn Hemel Reviewed-by: Allison Randal Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190531190114.292346262@linutronix.de Signed-off-by: Greg Kroah-Hartman

ACPI: Clean up acpi_os_map/unmap_memory() to eliminate __iomem.

2014-05-27T16:13:08+00:00

ACPICA doesn't include protections around address space checking, Linux build tests always complain increased sparse warnings around ACPICA internal acpi_os_map/unmap_memory() invocations. This patch tries to fix this issue permanently. There are 2 choices left for us to solve this issue: 1. Add __iomem address space awareness into ACPICA. 2. Remove sparse checker of __iomem from ACPICA source code. This patch chooses solution 2, because: 1. Most of the acpi_os_map/unmap_memory() invocations are used for ACPICA. table mappings, which in fact are not IO addresses. 2. The only IO addresses usage is for "system memory space" mapping code in: drivers/acpi/acpica/exregion.c drivers/acpi/acpica/evrgnini.c drivers/acpi/acpica/exregion.c The mapped address is accessed in the handler of "system memory space" - acpi_ex_system_memory_space_handler(). This function in fact can be changed to invoke acpi_os_read/write_memory() so that __iomem can always be type-casted in the OSL layer. According to the above investigation, we drew the following conclusion: It is not a good idea to introduce __iomem address space awareness into ACPICA mostly in order to protect non-IO addresses. We can simply remove __iomem for acpi_os_map/unmap_memory() to remove __iomem checker for ACPICA code. Then we need to enforce external usages to invoke other APIs that are aware of __iomem address space. The external usages are: drivers/acpi/apei/einj.c drivers/acpi/acpi_extlog.c drivers/char/tpm/tpm_acpi.c drivers/acpi/nvs.c This patch thus performs cleanups in this way: 1. Add acpi_os_map/unmap_iomem() to be invoked by non-ACPICA code. 2. Remove __iomem from acpi_os_map/unmap_memory(). Signed-off-by: Lv Zheng Signed-off-by: Rafael J. Wysocki

ACPI / NVS: Include appropriate header file in nvs.c

2014-01-05T23:13:22+00:00

Include header file internal.h in nvs.c because functions suspend_nvs_free(), suspend_nvs_alloc(), suspend_nvs_save() and suspend_nvs_restore() have their prototype declaration in internal.h. This eliminates the following warnings in nvs.c: drivers/acpi/nvs.c:128:6: warning: no previous prototype for ‘suspend_nvs_free’ [-Wmissing-prototypes] drivers/acpi/nvs.c:152:5: warning: no previous prototype for ‘suspend_nvs_alloc’ [-Wmissing-prototypes] drivers/acpi/nvs.c:169:5: warning: no previous prototype for ‘suspend_nvs_save’ [-Wmissing-prototypes] drivers/acpi/nvs.c:201:6: warning: no previous prototype for ‘suspend_nvs_restore’ [-Wmissing-prototypes] Signed-off-by: Rashika Kheria Reviewed-by: Josh Triplett Signed-off-by: Rafael J. Wysocki

ACPI / i915: Fix incorrect inclusions via

2013-12-07T00:24:33+00:00

To avoid build problems and breaking dependencies between ACPI header files, should not be included directly by code outside of the ACPI core subsystem. However, that is possible if is included, because that file contains a direct inclusion of . For this reason, remove the direct inclusion from , move that file from include/linux/ to include/acpi/ and make include it for CONFIG_ACPI set along with the other ACPI header files. Accordingly, Remove the inclusions of from everywhere. Of course, that causes the contents of the new file to be available for CONFIG_ACPI set only, so intel_opregion.o that depends on it should also depend on CONFIG_ACPI (and it really should not be compiled for CONFIG_ACPI unset anyway). References: https://01.org/linuxgraphics/sites/default/files/documentation/acpi_igd_opregion_spec.pdf Cc: Matthew Garrett Signed-off-by: Lv Zheng Acked-by: Daniel Vetter [rjw: Subject and changelog] Signed-off-by: Rafael J. Wysocki