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arch: remove ARCH_TASK_STRUCT_ALLOCATOR 

IA-64 was the only architecture which selected ARCH_TASK_STRUCT_ALLOCATOR.
IA-64 was removed with commit cf8e865810 ("arch: Remove Itanium (IA-64)
architecture"). Therefore remove support for ARCH_THREAD_STACK_ALLOCATOR
as well.

Link: https://lkml.kernel.org/r/20231116133638.1636277-3-hca@linux.ibm.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Heiko Carstens 2023-11-16 14:36:37 +01:00 committed by Andrew Morton
parent f72709ab69
commit 3888750e21
2 changed files with 0 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
arch/Kconfig
View File

@ -305,13 +305,8 @@ config ARCH_HAS_CPU_FINALIZE_INIT
config ARCH_TASK_STRUCT_ON_STACK
bool
# Select if arch has its private alloc_task_struct() function
config ARCH_TASK_STRUCT_ALLOCATOR
bool
config HAVE_ARCH_THREAD_STRUCT_WHITELIST
bool
depends on !ARCH_TASK_STRUCT_ALLOCATOR
help
An architecture should select this to provide hardened usercopy
knowledge about what region of the thread_struct should be

6
kernel/fork.c
View File

@ -165,7 +165,6 @@ void __weak arch_release_task_struct(struct task_struct *tsk)
{
}
#ifndef CONFIG_ARCH_TASK_STRUCT_ALLOCATOR
static struct kmem_cache *task_struct_cachep;
static inline struct task_struct *alloc_task_struct_node(int node)
@ -177,7 +176,6 @@ static inline void free_task_struct(struct task_struct *tsk)
{
kmem_cache_free(task_struct_cachep, tsk);
}
#endif
/*
* Allocate pages if THREAD_SIZE is >= PAGE_SIZE, otherwise use a
@ -1001,7 +999,6 @@ static void set_max_threads(unsigned int max_threads_suggested)
int arch_task_struct_size __read_mostly;
#endif
#ifndef CONFIG_ARCH_TASK_STRUCT_ALLOCATOR
static void task_struct_whitelist(unsigned long *offset, unsigned long *size)
{
/* Fetch thread_struct whitelist for the architecture. */
@ -1016,12 +1013,10 @@ static void task_struct_whitelist(unsigned long *offset, unsigned long *size)
else
*offset += offsetof(struct task_struct, thread);
}
#endif /* CONFIG_ARCH_TASK_STRUCT_ALLOCATOR */
void __init fork_init(void)
{
int i;
#ifndef CONFIG_ARCH_TASK_STRUCT_ALLOCATOR
#ifndef ARCH_MIN_TASKALIGN
#define ARCH_MIN_TASKALIGN 0
#endif
@ -1034,7 +1029,6 @@ void __init fork_init(void)
arch_task_struct_size, align,
SLAB_PANIC|SLAB_ACCOUNT,
useroffset, usersize, NULL);
#endif
/* do the arch specific task caches init */
arch_task_cache_init();