Guenter Roeck ceffd026f8 parisc: Strip upper 32 bit of sum in csum_ipv6_magic for 64-bit builds ... [ Upstream commit 0568b6f0d8 ] IPv6 checksum tests with unaligned addresses on 64-bit builds result in unexpected failures. Expected expected == csum_result, but expected == 46591 (0xb5ff) csum_result == 46381 (0xb52d) with alignment offset 1 Oddly enough, the problem disappeared after adding test code into the beginning of csum_ipv6_magic(). As it turns out, the 'sum' parameter of csum_ipv6_magic() is declared as __wsum, which is a 32-bit variable. However, it is treated as 64-bit variable in the 64-bit assembler code. Tests showed that the upper 32 bit of the register used to pass the variable are _not_ cleared when entering the function. This can result in checksum calculation errors. Clearing the upper 32 bit of 'sum' as first operation in the assembler code fixes the problem. Acked-by: Helge Deller <deller@gmx.de> Fixes: 1da177e4c3 ("Linux-2.6.12-rc2") Cc: stable@vger.kernel.org Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Sasha Levin <sashal@kernel.org>		2024-04-03 15:19:28 +02:00
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boot	…
configs	…
include	parisc: Strip upper 32 bit of sum in csum_ipv6_magic for 64-bit builds	2024-04-03 15:19:28 +02:00
kernel	parisc/unaligned: Rewrite 64-bit inline assembly of emulate_ldd()	2024-04-03 15:19:27 +02:00
lib	parisc: Drop homebrewn io[read|write]64_[lo_hi|hi_lo]	2022-09-23 21:52:27 +02:00
math-emu	parisc: align '*' in comment in math-emu code	2022-06-26 00:19:27 +02:00
mm	parisc: Fix random data corruption from exception handler	2024-02-23 09:12:50 +01:00
Kbuild	…
Kconfig	parisc: Fix random data corruption from exception handler	2024-02-23 09:12:50 +01:00
Kconfig.debug	…
Makefile	kbuild: remove head-y syntax	2022-10-02 18:06:03 +09:00
defpalo.conf	…
install.sh	…