[2.28 COMMITTED] riscv: Use __has_include__ to include <asm/syscalls.h> [BZ #24022]

[Florian Weimer <fweimer@redhat.com>]

From: H.J. Lu <hjl.tools@gmail.com>

<asm/syscalls.h> has been removed by

commit 27f8899d6002e11a6e2d995e29b8deab5aa9cc25
Author: David Abdurachmanov <david.abdurachmanov@gmail.com>
Date:   Thu Nov 8 20:02:39 2018 +0100

    riscv: add asm/unistd.h UAPI header

    Marcin Juszkiewicz reported issues while generating syscall table for riscv
    using 4.20-rc1. The patch refactors our unistd.h files to match some other
    architectures.

    - Add asm/unistd.h UAPI header, which has __ARCH_WANT_NEW_STAT only for 64-bit
    - Remove asm/syscalls.h UAPI header and merge to asm/unistd.h
    - Adjust kernel asm/unistd.h

    So now asm/unistd.h UAPI header should show all syscalls for riscv.

<asm/syscalls.h> may be restored by

Subject: [PATCH] riscv: restore asm/syscalls.h UAPI header
Date: Tue, 11 Dec 2018 09:09:35 +0100

UAPI header asm/syscalls.h was merged into UAPI asm/unistd.h header,
which did resolve issue with missing syscalls macros resulting in
glibc (2.28) build failure. It also broke glibc in a different way:
asm/syscalls.h is being used by glibc. I noticed this while doing
Fedora 30/Rawhide mass rebuild.

The patch returns asm/syscalls.h header and incl. it into asm/unistd.h.
I plan to send a patch to glibc to use asm/unistd.h instead of
asm/syscalls.h

In the meantime, we use __has_include__, which was added to GCC 5, to
check if <asm/syscalls.h> exists before including it.  Tested with
build-many-glibcs.py for riscv against kernel 4.19.12 and 4.20-rc7.

	[BZ #24022]
	* sysdeps/unix/sysv/linux/riscv/flush-icache.c: Check if
	<asm/syscalls.h> exists with __has_include__ before including it.

(cherry picked from commit 0b9c84906f653978fb8768c7ebd0ee14a47e662e)

2018-12-31  H.J. Lu  <hongjiu.lu@intel.com>

	[BZ #24022]
	* sysdeps/unix/sysv/linux/riscv/flush-icache.c: Check if
	<asm/syscalls.h> exists with __has_include__ before including it.

diff --git a/NEWS b/NEWS
index 865c075c82..388ac09060 100644
--- a/NEWS
+++ b/NEWS
@@ -29,6 +29,7 @@ The following bugs are resolved with this release:
   [23927] Linux if_nametoindex() does not close descriptor (CVE-2018-19591)
   [23972] __old_getdents64 uses wrong d_off value on overflow
   [24018] gettext may return NULL
+  [24022] riscv may lack <asm/syscalls.h>
   [24027] malloc: Integer overflow in realloc
 
 Security related changes:
diff --git a/sysdeps/unix/sysv/linux/riscv/flush-icache.c b/sysdeps/unix/sysv/linux/riscv/flush-icache.c
index d612ef4c6c..0b2042620b 100644
--- a/sysdeps/unix/sysv/linux/riscv/flush-icache.c
+++ b/sysdeps/unix/sysv/linux/riscv/flush-icache.c
@@ -21,7 +21,11 @@
 #include <stdlib.h>
 #include <atomic.h>
 #include <sys/cachectl.h>
-#include <asm/syscalls.h>
+#if __has_include__ (<asm/syscalls.h>)
+# include <asm/syscalls.h>
+#else
+# include <asm/unistd.h>
+#endif
 
 typedef int (*func_type) (void *, void *, unsigned long int);