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Commit 5b2b8071 authored by Anshuman Khandual's avatar Anshuman Khandual Committed by Michael Ellerman
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powerpc/mm: Invalidate subpage_prot() system call on radix platforms 



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: default avatarAnshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 3350eb2e

arch/powerpc/mm/subpage-prot.c

+3 −0
Original line number Diff line number Diff line
@@ -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 ||