[glibc] LoongArch: Fix inconsistency in SHMLBA macro values between glibc and kernel

[glibc] LoongArch: Fix inconsistency in SHMLBA macro values between glibc and kernel

[Yinyu Cai]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=3eed5f3a1ee356969afb403a1cf18d06f8d2d98a

commit 3eed5f3a1ee356969afb403a1cf18d06f8d2d98a
Author: caiyinyu <caiyinyu@loongson.cn>
Date:   Thu May 25 17:01:11 2023 +0800

    LoongArch: Fix inconsistency in SHMLBA macro values between glibc and kernel
    
    The LoongArch glibc was using the value of the SHMLBA macro from common code,
    which is __getpagesize() (16k), but this was inconsistent with the value of
    the SHMLBA macro in the kernel, which is SZ_64K (64k). This caused several
    shmat-related tests in LTP (Linux Test Project) to fail. This commit fixes
    the issue by ensuring that the glibc's SHMLBA macro value matches the value
    used in the kernel like other architectures.

Diff:
---
 sysdeps/unix/sysv/linux/loongarch/bits/shmlba.h | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/sysdeps/unix/sysv/linux/loongarch/bits/shmlba.h b/sysdeps/unix/sysv/linux/loongarch/bits/shmlba.h
new file mode 100644
index 0000000000..3c171ef7b6
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/loongarch/bits/shmlba.h
@@ -0,0 +1,24 @@
+/* Define SHMLBA.  LoongArch version.
+   Copyright (C) 2023 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#ifndef _SYS_SHM_H
+# error "Never use <bits/shmlba.h> directly; include <sys/shm.h> instead."
+#endif
+
+/* Segment low boundary address multiple.  */
+#define SHMLBA		0x10000