afalg: Use eventfd2 syscall instead of eventfd

The eventfd syscall is deprecated and is not available on aarch64, causing
build to fail:

    engines/e_afalg.c: In function 'eventfd':
    engines/e_afalg.c:108:20: error: '__NR_eventfd' undeclared (first use in this function)
         return syscall(__NR_eventfd, n);
                        ^

Instead, switch to the newer eventfd2 syscall, which is supposed to be
supported by all architectures.

This kind of issues would be avoided by simply using the eventfd(2)
wrapper from the libc, but there must be subtle reasons not to...

Tested on a aarch64 system running OpenSUSE Leap 42.1 (gcc118 from
https://cfarm.tetaneutral.net/machines/list/ ) and also cross-compiling
for aarch64 with LEDE (kernel 4.9).

This properly fixes #1685.

CLA: trivial
Fixes: 7f458a48 ("ALG: Add AFALG engine")
Signed-off-by: Baptiste Jonglez <git@bitsofnetworks.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4617)

diff --git a/engines/e_afalg.c b/engines/e_afalg.c
index 7e682554ed953a627d3175e44e7f118461bc70d3..e6fa5472d37ccb0e80eb5524d2d93386e7524ae2 100644 (file)
--- a/engines/e_afalg.c
+++ b/engines/e_afalg.c
@@ -105,7 +105,7 @@ static ossl_inline int io_setup(unsigned n, aio_context_t *ctx)
 
 static ossl_inline int eventfd(int n)
 {
-    return syscall(__NR_eventfd, n);
+    return syscall(__NR_eventfd2, n, 0);
 }
 
 static ossl_inline int io_destroy(aio_context_t ctx)