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authorLinus Torvalds <torvalds@linux-foundation.org>2021-02-24 09:19:31 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2021-02-24 09:19:31 -0800
commitb866bc5fe0f9626e557fc011048cdb1811451960 (patch)
treeb4adf503e9c7327ecf65f5eb18ee6a6225ca73b3 /arch
parenta555bdd0c58ce368fb1324f0e93d17f7c4babece (diff)
parent7f7bc20bc41a4fbcd2db75b375ac95e5faf958ae (diff)
downloadlinux-b866bc5fe0f9626e557fc011048cdb1811451960.tar.gz
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
Diffstat (limited to 'arch')
-rw-r--r--arch/nios2/kernel/entry.S3
-rw-r--r--arch/nios2/kernel/setup.c21
-rw-r--r--arch/nios2/kernel/sys_nios2.c11
3 files changed, 24 insertions, 11 deletions
diff --git a/arch/nios2/kernel/entry.S b/arch/nios2/kernel/entry.S
index da8442450e46..0794cd7803df 100644
--- a/arch/nios2/kernel/entry.S
+++ b/arch/nios2/kernel/entry.S
@@ -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
diff --git a/arch/nios2/kernel/setup.c b/arch/nios2/kernel/setup.c
index 3c6e3c813a0b..d2f21957e99c 100644
--- a/arch/nios2/kernel/setup.c
+++ b/arch/nios2/kernel/setup.c
@@ -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),
diff --git a/arch/nios2/kernel/sys_nios2.c b/arch/nios2/kernel/sys_nios2.c
index cd390ec4f88b..b1ca85699952 100644
--- a/arch/nios2/kernel/sys_nios2.c
+++ b/arch/nios2/kernel/sys_nios2.c
@@ -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;
}