linux-kernel - [PATCH 4.4 50/54] tools/lib/subcmd/pager.c: do not alias select() params

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Date:   Thu, 30 Jul 2020 10:05:29 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 4.4 50/54] tools/lib/subcmd/pager.c: do not alias select() params

From: Sergey Senozhatsky <sergey.senozhatsky@...il.com>

commit dfbc3c6cb747c074aa2ba0a10bbeea588d6dfda6 upstream.

[ Change applied file from tools/lib/subcmd/pager.c to
  tools/perf/util/pager.c ]

Use a separate fd set for select()-s exception fds param to fix the
following gcc warning:

  pager.c:36:12: error: passing argument 2 to restrict-qualified parameter aliases with argument 4 [-Werror=restrict]
    select(1, &in, NULL, &in, NULL);
              ^~~        ~~~

Link: http://lkml.kernel.org/r/20180101105626.7168-1-sergey.senozhatsky@gmail.com
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 tools/perf/util/pager.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/tools/perf/util/pager.c
+++ b/tools/perf/util/pager.c
@@ -16,10 +16,13 @@ static void pager_preexec(void)
 	 * have real input
 	 */
 	fd_set in;
+	fd_set exception;
 
 	FD_ZERO(&in);
+	FD_ZERO(&exception);
 	FD_SET(0, &in);
-	select(1, &in, NULL, &in, NULL);
+	FD_SET(0, &exception);
+	select(1, &in, NULL, &exception, NULL);
 
 	setenv("LESS", "FRSX", 0);
 }