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powerpc/mm: Invalidate subpage_prot() system call on radix platforms

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Radix enabled platforms don't support subpage_prot() system calls. But
at present the system call goes through without an error and fails
later on while validating expected subpage accesses. Lets not allow
the system call on powerpc radix platforms to begin with to prevent
this confusion in user space.

Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Anshuman Khandual 2017-12-04 11:19:22 +05:30 committed by Michael Ellerman
parent 3350eb2ea1
commit 5b2b807147
1 changed files with 3 additions and 0 deletions
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arch/powerpc/mm/subpage-prot.c
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@ -195,6 +195,9 @@ long sys_subpage_prot(unsigned long addr, unsigned long len, u32 __user *map)
unsigned long next, limit;
int err;
if (radix_enabled())
return -ENOENT;
/* Check parameters */
if ((addr & ~PAGE_MASK) || (len & ~PAGE_MASK) ||
addr >= mm->task_size || len >= mm->task_size ||