linux-kernel - [PATCH v2] samples: mei: Fix building on musl libc

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Message-ID: <20250702135955.24955-1-listout@listout.xyz>
Date: Wed,  2 Jul 2025 19:29:55 +0530
From: Brahmajit Das <listout@...tout.xyz>
To: linux-kernel@...r.kernel.org
Cc: alexander.usyskin@...el.com,
	tomas.winkler@...el.com,
	gregkh@...uxfoundation.org
Subject: [PATCH v2] samples: mei: Fix building on musl libc

The header bits/wordsize.h is glibc specific and on building on musl
with allyesconfig results in

samples/mei/mei-amt-version.c:77:10: fatal error: bits/wordsize.h: No such file or directory
   77 | #include <bits/wordsize.h>
      |          ^~~~~~~~~~~~~~~~~

mei-amt-version.c build file without bits/wordsize.h on musl and glibc.

However on musl we get the follwing error without sys/time.h

samples/mei/mei-amt-version.c: In function 'mei_recv_msg':
samples/mei/mei-amt-version.c:159:24: error: storage size of 'tv' isn't known
  159 |         struct timeval tv;
      |                        ^~
samples/mei/mei-amt-version.c:160:9: error: unknown type name 'fd_set'
  160 |         fd_set set;
      |         ^~~~~~
samples/mei/mei-amt-version.c:168:9: error: implicit declaration of function 'FD_ZERO' [-Wimplicit-function-declaration]
  168 |         FD_ZERO(&set);
      |         ^~~~~~~
samples/mei/mei-amt-version.c:169:9: error: implicit declaration of function 'FD_SET'; did you mean 'L_SET'? [-Wimplicit-function-declaration]
  169 |         FD_SET(me->fd, &set);
      |         ^~~~~~
      |         L_SET
samples/mei/mei-amt-version.c:170:14: error: implicit declaration of function 'select' [-Wimplicit-function-declaration]
  170 |         rc = select(me->fd + 1, &set, NULL, NULL, &tv);
      |              ^~~~~~
samples/mei/mei-amt-version.c:171:23: error: implicit declaration of function 'FD_ISSET' [-Wimplicit-function-declaration]
  171 |         if (rc > 0 && FD_ISSET(me->fd, &set)) {
      |                       ^~~~~~~~
samples/mei/mei-amt-version.c:159:24: warning: unused variable 'tv' [-Wunused-variable]
  159 |         struct timeval tv;
      |                        ^~

Hence the the file has been included.

Fixes: c52827cc4ddf ("staging/mei: add mei user space example")
Signed-off-by: Brahmajit Das <listout@...tout.xyz>
---
 samples/mei/mei-amt-version.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/samples/mei/mei-amt-version.c b/samples/mei/mei-amt-version.c
index 867debd3b912..1d7254bcb44c 100644
--- a/samples/mei/mei-amt-version.c
+++ b/samples/mei/mei-amt-version.c
@@ -69,11 +69,11 @@
 #include <string.h>
 #include <fcntl.h>
 #include <sys/ioctl.h>
+#include <sys/time.h>
 #include <unistd.h>
 #include <errno.h>
 #include <stdint.h>
 #include <stdbool.h>
-#include <bits/wordsize.h>
 #include <linux/mei.h>
 
 /*****************************************************************************
-- 
2.50.0