linux-kernel - [question] pread2, pwrite2 unistd symbols for compat

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Date:	Mon, 2 May 2016 16:47:06 +0300
From:	Yury Norov <ynorov@...iumnetworks.com>
To:	Andre Przywara <andre.przywara@....com>,
	Arnd Bergmann <arnd@...db.de>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Subject: [question] pread2, pwrite2 unistd symbols for compat

Hi Andre, 

In patch 987aedb5d (eneric syscalls: wire up preadv2 and pwritev2
syscalls) you add those syscalls with __SYSCALL macro. However,
compat architectures that does not use generic unistd (mips, s390),
declare compat version in their syscall tables. Maybe we'd replace
__SYSCALL macro with __SC_COMP?

Yury.


diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
index 723479c..6ed4613 100644
--- a/include/uapi/asm-generic/unistd.h
+++ b/include/uapi/asm-generic/unistd.h
@@ -721,9 +721,9 @@ __SC_WRAP(__NR_mlock2, sys_mlock2)
 #define __NR_copy_file_range 285
 __SC_WRAP(__NR_copy_file_range, sys_copy_file_range)
 #define __NR_preadv2 286
-__SYSCALL(__NR_preadv2, sys_preadv2)
+__SC_COMP(__NR_preadv2, sys_preadv2, compat_sys_preadv2)
 #define __NR_pwritev2 287
-__SYSCALL(__NR_pwritev2, sys_pwritev2)
+__SC_COMP(__NR_pwritev2, sys_pwritev2, compat_sys_pwritev2)
 
 #undef __NR_syscalls
 #define __NR_syscalls 288