[PATCH] syscall(2): note parisc handling of aligned register pairs

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While parisc would normally have the same behavior as ARM/PowerPC,
they decide to write shim syscall stubs to unpack/realign rather
than expose the padding to userspace.

Signed-off-by: Mike Frysinger <vapier@xxxxxxxxxx>
---
 man2/syscall.2 | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/man2/syscall.2 b/man2/syscall.2
index f8c89b84356d..b55540e039b7 100644
--- a/man2/syscall.2
+++ b/man2/syscall.2
@@ -133,6 +133,10 @@ on PowerPC with the 32-bit ABI, and on Xtensa.
 .\" Mike Frysinger: this issue ends up forcing MIPS
 .\" O32 to take 7 arguments to syscall()
 
+.\" See arch/parisc/kernel/sys_parisc.c.
+Note that while the parisc C ABI also uses aligned register pairs,
+it uses a shim layer to hide the issue from userspace.
+
 The affected system calls are
 .BR fadvise64_64 (2),
 .BR ftruncate64 (2),
-- 
2.12.0

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