From: Alexander Gordeev agordeev@linux.ibm.com
[ Upstream commit 45d619bdaf799196d702a9ae464b07066d6db2f9 ]
Symbols _edata and _end in the linker script are the only unaligned expicitly on page boundary. Although _end is aligned implicitly by BSS_SECTION macro that is still inconsistent and could lead to a bug if a tool or function would assume that _edata is as aligned as others.
For example, vmem_map_init() function does not align symbols _etext, _einittext etc. Should these symbols be unaligned as well, the size of ranges to update were short on one page.
Instead of fixing every occurrence of this kind in the code and external tools just force the alignment on these two symbols.
Reviewed-by: Heiko Carstens hca@linux.ibm.com Signed-off-by: Alexander Gordeev agordeev@linux.ibm.com Signed-off-by: Heiko Carstens hca@linux.ibm.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/s390/kernel/vmlinux.lds.S | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/s390/kernel/vmlinux.lds.S b/arch/s390/kernel/vmlinux.lds.S index 5ea3830af0cc..f81d96710595 100644 --- a/arch/s390/kernel/vmlinux.lds.S +++ b/arch/s390/kernel/vmlinux.lds.S @@ -79,6 +79,7 @@ SECTIONS _end_amode31_refs = .; }
+ . = ALIGN(PAGE_SIZE); _edata = .; /* End of data section */
/* will be freed after init */ @@ -193,6 +194,7 @@ SECTIONS
BSS_SECTION(PAGE_SIZE, 4 * PAGE_SIZE, PAGE_SIZE)
+ . = ALIGN(PAGE_SIZE); _end = . ;
/*