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| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2012-10-04 19:02:02 +0400 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2012-10-09 16:16:59 +0400 |
| commit | 8fe234d3c8d66771b327accb8eef26f70a8a8db8 (patch) | |
| tree | b8dc843924f66162ccdcbd77a1e245ee9b72b490 /arch/s390/mm/vmem.c | |
| parent | e76e82d772522b05ed93228478d2a4460754b6a4 (diff) | |
| download | linux-8fe234d3c8d66771b327accb8eef26f70a8a8db8.tar.xz | |
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>
Diffstat (limited to 'arch/s390/mm/vmem.c')
| -rw-r--r-- | arch/s390/mm/vmem.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c index 5b70393911bd..d402b19f1df2 100644 --- a/arch/s390/mm/vmem.c +++ b/arch/s390/mm/vmem.c @@ -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) |