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From: "arnd at linaro dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/102162] Byte-wise access optimized away at -O1 and
 above
Date: Thu, 02 Sep 2021 09:01:24 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102162

--- Comment #27 from Arnd Bergmann <arnd at linaro dot org> ---
The linux kernel instance from arch/parisc/ looks like a bug we fixed in
arch/arm a few years ago, by adding the required alignment directive to the
linker script.

If changing the linker script is not possible because of boot loader
requirements, then this should do as well:

diff --git a/arch/parisc/boot/compressed/misc.c
b/arch/parisc/boot/compressed/misc.c
index 2d395998f524..b91d6cf80c06 100644
--- a/arch/parisc/boot/compressed/misc.c
+++ b/arch/parisc/boot/compressed/misc.c
@@ -26,7 +26,7 @@
 extern char input_data[];
 extern int input_len;
 /* output_len is inserted by the linker possibly at an unaligned address */
-extern __le32 output_len __aligned(1);
+extern struct { __u8 bytes; } output_len;
 extern char _text, _end;
 extern char _bss, _ebss;
 extern char _startcode_end;=