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nios2 update for nios2-5.12-rc1

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nios2: Don't use _end for calculating min_low_pfn
 nios2: fixed broken sys_clone syscall
 Take mmap lock in cacheflush syscall
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Merge tag 'nios2-5.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/lftan/nios2

Pull arch/nios2 updates from Ley Foon Tan:

 - don't use _end for calculating min_low_pfn

 - fix broken sys_clone syscall

 - take mmap lock in cacheflush syscall

* tag 'nios2-5.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/lftan/nios2:
  nios2: Don't use _end for calculating min_low_pfn
  nios2: fixed broken sys_clone syscall
  Take mmap lock in cacheflush syscall
This commit is contained in:
Linus Torvalds 2021-02-24 09:19:31 -08:00
commit b866bc5fe0
3 changed files with 24 additions and 11 deletions
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3
arch/nios2/kernel/entry.S
View File

@ -389,7 +389,10 @@ ENTRY(ret_from_interrupt)
*/
ENTRY(sys_clone)
SAVE_SWITCH_STACK
subi sp, sp, 4 /* make space for tls pointer */
stw r8, 0(sp) /* pass tls pointer (r8) via stack (5th argument) */
call nios2_clone
addi sp, sp, 4
RESTORE_SWITCH_STACK
ret

21
arch/nios2/kernel/setup.c
View File

@ -32,8 +32,6 @@ EXPORT_SYMBOL(memory_start);
unsigned long memory_end;
EXPORT_SYMBOL(memory_end);
unsigned long memory_size;
static struct pt_regs fake_regs = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0,
0};
@ -141,16 +139,22 @@ asmlinkage void __init nios2_boot_init(unsigned r4, unsigned r5, unsigned r6,
parse_early_param();
}
static void __init find_limits(unsigned long *min, unsigned long *max_low,
unsigned long *max_high)
{
*max_low = PFN_DOWN(memblock_get_current_limit());
*min = PFN_UP(memblock_start_of_DRAM());
*max_high = PFN_DOWN(memblock_end_of_DRAM());
}
void __init setup_arch(char **cmdline_p)
{
int dram_start;
console_verbose();
dram_start = memblock_start_of_DRAM();
memory_size = memblock_phys_mem_size();
memory_start = PAGE_ALIGN((unsigned long)__pa(_end));
memory_end = (unsigned long) CONFIG_NIOS2_MEM_BASE + memory_size;
memory_start = memblock_start_of_DRAM();
memory_end = memblock_end_of_DRAM();
init_mm.start_code = (unsigned long) _stext;
init_mm.end_code = (unsigned long) _etext;
@ -161,11 +165,10 @@ void __init setup_arch(char **cmdline_p)
/* Keep a copy of command line */
*cmdline_p = boot_command_line;
min_low_pfn = PFN_UP(memory_start);
max_low_pfn = PFN_DOWN(memory_end);
find_limits(&min_low_pfn, &max_low_pfn, &max_pfn);
max_mapnr = max_low_pfn;
memblock_reserve(dram_start, memory_start - dram_start);
memblock_reserve(__pa_symbol(_stext), _end - _stext);
#ifdef CONFIG_BLK_DEV_INITRD
if (initrd_start) {
memblock_reserve(virt_to_phys((void *)initrd_start),

11
arch/nios2/kernel/sys_nios2.c
View File

@ -22,6 +22,7 @@ asmlinkage int sys_cacheflush(unsigned long addr, unsigned long len,
unsigned int op)
{
struct vm_area_struct *vma;
struct mm_struct *mm = current->mm;
if (len == 0)
return 0;
@ -34,16 +35,22 @@ asmlinkage int sys_cacheflush(unsigned long addr, unsigned long len,
if (addr + len < addr)
return -EFAULT;
if (mmap_read_lock_killable(mm))
return -EINTR;
/*
* Verify that the specified address region actually belongs
* to this process.
*/
vma = find_vma(current->mm, addr);
if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end)
vma = find_vma(mm, addr);
if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end) {
mmap_read_unlock(mm);
return -EFAULT;
}
flush_cache_range(vma, addr, addr + len);
mmap_read_unlock(mm);
return 0;
}