Messages in this thread Patch in this message | | | From | Helge Deller <> | Subject | [PATCH 1/2] modules: Ensure natural alignment for .altinstructions and __bug_table sections | Date | Mon, 27 Jun 2022 21:05:50 +0200 |
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In the kernel image vmlinux.lds.S linker scripts the .altinstructions and __bug_table sections are 32- or 64-bit aligned because they hold 32- and/or 64-bit values.
But for modules the module.lds.S linker script doesn't define a default alignment yet, so the linker chooses the default byte-alignment, which then leads to unnecessary unaligned memory accesses at runtime.
This patch adds the missing alignments.
Signed-off-by: Helge Deller <deller@gmx.de> --- scripts/module.lds.S | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/scripts/module.lds.S b/scripts/module.lds.S index 1d0e1e4dc3d2..3a3aa2354ed8 100644 --- a/scripts/module.lds.S +++ b/scripts/module.lds.S @@ -27,6 +27,8 @@ SECTIONS { .ctors 0 : ALIGN(8) { *(SORT(.ctors.*)) *(.ctors) } .init_array 0 : ALIGN(8) { *(SORT(.init_array.*)) *(.init_array) }
+ .altinstructions 0 : ALIGN(8) { KEEP(*(.altinstructions)) } + __bug_table 0 : ALIGN(8) { KEEP(*(__bug_table)) } __jump_table 0 : ALIGN(8) { KEEP(*(__jump_table)) }
__patchable_function_entries : { *(__patchable_function_entries) } -- 2.35.3
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