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Commit 8fe234d3c8d66771b327accb8eef26f70a8a8db8

Authored by Heiko Carstens
Committed by Martin Schwidefsky
1 parent e76e82d772
Exists in smarc-l5.0.0_1.0.0-ga and in 5 other branches imx_3.10.17_1.0.1_ga, imx_3.10.53_1.1.0_ga, imx_3.14.28_1.0.0_ga, smarc-imx_3.10.53_1.1.0_ga, smarc-imx_3.14.28_1.0.0_ga

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>

Showing 1 changed file with 2 additions and 2 deletions Side-by-side Diff

... ... @@ -331,8 +331,8 @@
331 331 unsigned long start, end;
332 332 int i;
333 333  
334   - ro_start = ((unsigned long)&_stext) & PAGE_MASK;
335   - ro_end = PFN_ALIGN((unsigned long)&_eshared);
  334 + ro_start = PFN_ALIGN((unsigned long)&_stext);
  335 + ro_end = (unsigned long)&_eshared & PAGE_MASK;
336 336 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
337 337 if (memory_chunk[i].type == CHUNK_CRASHK ||
338 338 memory_chunk[i].type == CHUNK_OLDMEM)