Commit 8fe234d3 authored Oct 04, 2012 by Heiko Carstens Committed by Martin Schwidefsky Oct 09, 2012

s390/mm: fix mapping of read-only kernel text section



Within the identity mapping the kernel text section is mapped read-only.
However when mapping the first and last page of the text section we must
round upwards and downwards respectively, if only parts of a page belong
to the section.
Otherwise potential rw data can be mapped read-only. So the rounding must
be done just the other way we have it right now.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

parent e76e82d7

arch/s390/mm/vmem.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -331,8 +331,8 @@ void __init vmem_map_init(void)
		unsigned long start, end;
		int i;

		ro_start = ((unsigned long)&_stext) & PAGE_MASK;
		ro_end = PFN_ALIGN((unsigned long)&_eshared);
		ro_start = PFN_ALIGN((unsigned long)&_stext);
		ro_end = (unsigned long)&_eshared & PAGE_MASK;
		for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
		if (memory_chunk[i].type == CHUNK_CRASHK \|\|
		memory_chunk[i].type == CHUNK_OLDMEM)

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