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nios2: define virtual address space for modules

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nios2 uses kmalloc() to implement module_alloc() because CALL26/PCREL26
cannot reach all of vmalloc address space.

Define module space as 32MiB below the kernel base and switch nios2 to
use vmalloc for module allocations.

Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Dinh Nguyen <dinguyen@kernel.org>
Acked-by: Song Liu <song@kernel.org>
Signed-off-by: Mike Rapoport (IBM) <rppt@kernel.org>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
This commit is contained in:
Mike Rapoport (IBM) 2024-05-05 19:06:15 +03:00 committed by Luis Chamberlain
parent 0cdf5876c4
commit 38762155fd
2 changed files with 8 additions and 16 deletions
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5
arch/nios2/include/asm/pgtable.h
View file

@ -25,7 +25,10 @@
#include <asm-generic/pgtable-nopmd.h>
#define VMALLOC_START CONFIG_NIOS2_KERNEL_MMU_REGION_BASE
#define VMALLOC_END (CONFIG_NIOS2_KERNEL_REGION_BASE - 1)
#define VMALLOC_END (CONFIG_NIOS2_KERNEL_REGION_BASE - SZ_32M - 1)
#define MODULES_VADDR (CONFIG_NIOS2_KERNEL_REGION_BASE - SZ_32M)
#define MODULES_END (CONFIG_NIOS2_KERNEL_REGION_BASE - 1)
struct mm_struct;

19
arch/nios2/kernel/module.c
View file

@ -21,23 +21,12 @@
#include <asm/cacheflush.h>
/*
* Modules should NOT be allocated with kmalloc for (obvious) reasons.
* But we do it for now to avoid relocation issues. CALL26/PCREL26 cannot reach
* from 0x80000000 (vmalloc area) to 0xc00000000 (kernel) (kmalloc returns
* addresses in 0xc0000000)
*/
void *module_alloc(unsigned long size)
{
if (size == 0)
return NULL;
return kmalloc(size, GFP_KERNEL);
}
/* Free memory returned from module_alloc */
void module_memfree(void *module_region)
{
kfree(module_region);
return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END,
GFP_KERNEL, PAGE_KERNEL_EXEC,
VM_FLUSH_RESET_PERMS, NUMA_NO_NODE,
__builtin_return_address(0));
}
int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,