Commit eac522ef authored Mar 28, 2011 by David Howells

NOMMU: percpu should use is_vmalloc_addr().

per_cpu_ptr_to_phys() uses VMALLOC_START and VMALLOC_END to determine if an
address is in the vmalloc() region or not. This is incorrect on NOMMU as
there is no real vmalloc() capability (vmalloc() is emulated by kmalloc()).

The correct way to do this is to use is_vmalloc_addr(). This encapsulates the
vmalloc() region test in MMU mode and just returns 0 in NOMMU mode.

On FRV in NOMMU mode, the percpu compilation fails without this patch:

mm/percpu.c: In function 'per_cpu_ptr_to_phys':
mm/percpu.c:1011: error: 'VMALLOC_START' undeclared (first use in this function)
mm/percpu.c:1011: error: (Each undeclared identifier is reported only once
mm/percpu.c:1011: error: for each function it appears in.)
mm/percpu.c:1012: error: 'VMALLOC_END' undeclared (first use in this function)
mm/percpu.c:1018: warning: control reaches end of non-void function

Signed-off-by: David Howells <dhowells@redhat.com>

parent 16c29daf

mm/percpu.c

+1 −2

Original line number	Diff line number	Diff line
		@@ -1008,8 +1008,7 @@ phys_addr_t per_cpu_ptr_to_phys(void *addr)
		}

		if (in_first_chunk) {
		if ((unsigned long)addr < VMALLOC_START \|\|
		(unsigned long)addr >= VMALLOC_END)
		if (!is_vmalloc_addr(addr))
		return __pa(addr);
		else
		return page_to_phys(vmalloc_to_page(addr));

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