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authorVasily Gorbik <gor@linux.ibm.com>2020-10-19 11:01:33 +0200
committerHeiko Carstens <hca@linux.ibm.com>2020-11-20 19:19:10 +0100
commit73045a08cf5549cc7dee14463431fbeb2134dd67 (patch)
treee332a31ea39cbc7748b6b42349544d24db806203 /drivers/s390
parent1e632eaa0f4b7f65a81301205ca122024991e1d3 (diff)
downloadlinux-73045a08cf5549cc7dee14463431fbeb2134dd67.tar.bz2
s390: unify identity mapping limits handling
Currently we have to consider too many different values which in the end only affect identity mapping size. These are: 1. max_physmem_end - end of physical memory online or standby. Always <= end of the last online memory block (get_mem_detect_end()). 2. CONFIG_MAX_PHYSMEM_BITS - the maximum size of physical memory the kernel is able to support. 3. "mem=" kernel command line option which limits physical memory usage. 4. OLDMEM_BASE which is a kdump memory limit when the kernel is executed as crash kernel. 5. "hsa" size which is a memory limit when the kernel is executed during zfcp/nvme dump. Through out kernel startup and run we juggle all those values at once but that does not bring any amusement, only confusion and complexity. Unify all those values to a single one we should really care, that is our identity mapping size. Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com> Acked-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/char/sclp_cmd.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/s390/char/sclp_cmd.c b/drivers/s390/char/sclp_cmd.c
index 7ebe89890a9b..d41bc144c183 100644
--- a/drivers/s390/char/sclp_cmd.c
+++ b/drivers/s390/char/sclp_cmd.c
@@ -401,10 +401,10 @@ static void __init add_memory_merged(u16 rn)
goto skip_add;
if (start + size > VMEM_MAX_PHYS)
size = VMEM_MAX_PHYS - start;
- if (memory_end_set && (start >= memory_end))
+ if (start >= ident_map_size)
goto skip_add;
- if (memory_end_set && (start + size > memory_end))
- size = memory_end - start;
+ if (start + size > ident_map_size)
+ size = ident_map_size - start;
block_size = memory_block_size_bytes();
align_to_block_size(&start, &size, block_size);
if (!size)