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authorHelge Deller <deller@gmx.de>2021-09-02 23:24:42 +0200
committerHelge Deller <deller@gmx.de>2021-09-03 09:47:02 +0200
commitc42813b71a06a2ff4a155aa87ac609feeab76cf3 (patch)
tree540c6dd6c8a11ab9b7409c67c4cc575fd905f1ee /arch
parente5a2cac908df691f1637f9272d4c6dec83239611 (diff)
parisc: Fix unaligned-access crash in bootloader
Kernel v5.14 has various changes to optimize unaligned memory accesses, e.g. commit 0652035a5794 ("asm-generic: unaligned: remove byteshift helpers"). Those changes triggered an unalignment-exception and thus crashed the bootloader on parisc because the unaligned "output_len" variable now suddenly was read word-wise while it was read byte-wise in the past. Fix this issue by declaring the external output_len variable as char which then forces the compiler to generate byte-accesses. Signed-off-by: Helge Deller <deller@gmx.de> Cc: Arnd Bergmann <arnd@kernel.org> Cc: John David Anglin <dave.anglin@bell.net> Bug: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102162 Fixes: 8c031ba63f8f ("parisc: Unbreak bootloader due to gcc-7 optimizations") Fixes: 0652035a5794 ("asm-generic: unaligned: remove byteshift helpers") Cc: <stable@vger.kernel.org> # v5.14+
Diffstat (limited to 'arch')
-rw-r--r--arch/parisc/boot/compressed/misc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/parisc/boot/compressed/misc.c b/arch/parisc/boot/compressed/misc.c
index 2d395998f524..7ee49f5881d1 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 char output_len;
extern char _text, _end;
extern char _bss, _ebss;
extern char _startcode_end;