kernel.git/drivers/s390/char/sclp_cmd.c, branch master

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

2026-02-22T01:09:51Z

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

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21T09:02:28Z

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

s390: Remove KMSG_COMPONENT macro

2025-11-24T10:45:21Z

The KMSG_COMPONENT macro is a leftover of the s390 specific "kernel message catalog" which never made it upstream. Remove the macro in order to get rid of a pointless indirection. Replace all users with the string it defines. In almost all cases this leads to a simple replacement like this: - #define KMSG_COMPONENT "appldata" - #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + #define pr_fmt(fmt) "appldata: " fmt Except for some special cases this is just mechanical/scripted work. Acked-by: Thomas Richter Signed-off-by: Heiko Carstens

s390/sclp: Move memory hotplug code for better modularity

2025-08-20T14:38:23Z

To improve readability and prepare for future extensions, move the memory hotplug code to a separate file. In addtion to it, add required headers in sclp_mem.c and remove unnecessary headers in sclp_cmd.c Acked-by: Heiko Carstens Signed-off-by: Sumanth Korikkar Signed-off-by: Alexander Gordeev

s390/sclp: Refactor sclp_cmd.c

2025-08-20T14:38:23Z

To improve readability, refactor sclp_cmd.c: * Move defines and structures to the beginning. * Reverse x-mas tree usage. * Remove spaces after casting to eliminate checkpatch warnings. * Remove unnecessary comments. * Reframe certain comments. * Convert all unsigned long long to unsigned long since unsigned long long is a leftover from the 31/32-bit era. * Use correct format specifiers. * Add braces to for loops with bodies containing more than one line. * Sort header files and remove unnecessary ones. * Use __packed and __aligned instead of __attribute((packed, aligned(8))) in structures. Acked-by: Heiko Carstens Signed-off-by: Sumanth Korikkar Signed-off-by: Alexander Gordeev

s390/drivers: Remove unnecessary include

2025-06-17T16:18:03Z

Remove include from all files which do not contain an EXPORT_SYMBOL(). See commit 7d95680d64ac ("scripts/misc-check: check unnecessary #include when W=1") for more details. Acked-by: Alexander Gordeev Signed-off-by: Heiko Carstens Signed-off-by: Alexander Gordeev

s390/cpufeature: Convert MACHINE_HAS_EDAT1 to cpu_has_edat1()

2025-03-04T16:18:05Z

Convert MACHINE_HAS_... to cpu_has_...() which uses test_facility() instead of testing the machine_flags lowcore member if the feature is present. test_facility() generates better code since it results in a static branch without accessing memory. The branch is patched via alternatives by the decompressor depending on the availability of the required facility. Reviewed-by: Vasily Gorbik Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik

s390/sclp: Define commands for storage (un)assignment

2024-06-18T15:01:33Z

Replace immediate values with SCLP_CMDW_UN|ASSIGN_STORAGE defines. Acked-by: Heiko Carstens Link: https://lore.kernel.org/r/20240610151048.2548428-1-agordeev@linux.ibm.com Signed-off-by: Alexander Gordeev Signed-off-by: Vasily Gorbik

s390/mm: implement MEM_PREPARE_ONLINE/MEM_FINISH_OFFLINE notifiers

2024-02-22T00:00:02Z

MEM_PREPARE_ONLINE memory notifier makes memory block physical accessible via sclp assign command. The notifier ensures self-contained memory maps are accessible and hence enabling the "memmap on memory" on s390. MEM_FINISH_OFFLINE memory notifier shifts the memory block to an inaccessible state via sclp unassign command. Implementation considerations: * When MHP_MEMMAP_ON_MEMORY is disabled, the system retains the old behavior. This means the memory map is allocated from default memory. * If MACHINE_HAS_EDAT1 is unavailable, MHP_MEMMAP_ON_MEMORY is automatically disabled. This ensures that vmemmap pagetables do not consume additional memory from the default memory allocator. * The MEM_GOING_ONLINE notifier has been modified to perform no operation, as MEM_PREPARE_ONLINE already executes the sclp assign command. * The MEM_CANCEL_ONLINE/MEM_OFFLINE notifier now performs no operation, as MEM_FINISH_OFFLINE already executes the sclp unassign command. Link: https://lkml.kernel.org/r/20240108132747.3238763-5-sumanthk@linux.ibm.com Reviewed-by: Gerald Schaefer Reviewed-by: David Hildenbrand Signed-off-by: Sumanth Korikkar Cc: Alexander Gordeev Cc: Aneesh Kumar K.V Cc: Anshuman Khandual Cc: Heiko Carstens Cc: Michal Hocko Cc: Oscar Salvador Cc: Vasily Gorbik Signed-off-by: Andrew Morton

s390/sclp: remove unhandled memory notifier type

2024-02-22T00:00:02Z

Remove memory notifier types which are unhandled by s390. Unhandled memory notifier types are covered by default case. Link: https://lkml.kernel.org/r/20240108132747.3238763-4-sumanthk@linux.ibm.com Suggested-by: Alexander Gordeev Reviewed-by: David Hildenbrand Signed-off-by: Sumanth Korikkar Cc: Aneesh Kumar K.V Cc: Anshuman Khandual Cc: Gerald Schaefer Cc: Heiko Carstens Cc: Michal Hocko Cc: Oscar Salvador Cc: Vasily Gorbik Signed-off-by: Andrew Morton