From: Jens Axboe <axboe@fb.com>
Date: Mon, 20 Oct 2014 16:52:31 +0000 (-0600)
Subject: fio: add alignment check for fp fields
X-Git-Tag: fio-2.1.14~47
X-Git-Url: https://git.kernel.dk/?p=fio.git;a=commitdiff_plain;h=976a77566d8b735fd0c064f33332aa4e0204122c

fio: add alignment check for fp fields

Signed-off-by: Jens Axboe <axboe@fb.com>
---

diff --git a/libfio.c b/libfio.c
index 5a996f9c..7eff63b4 100644
--- a/libfio.c
+++ b/libfio.c
@@ -297,6 +297,14 @@ int initialize_fio(char *envp[])
 {
 	long ps;
 
+	/*
+	 * We need these to be properly 64-bit aligned, otherwise we
+	 * can run into problems on archs that fault on unaligned fp
+	 * access (ARM).
+	 */
+	compiletime_assert((offsetof(struct thread_stat, percentile_list) % 8) == 0, "fp align");
+	compiletime_assert((offsetof(struct thread_stat, latency_percentile) % 8) == 0, "fp align");
+
 	if (endian_check()) {
 		log_err("fio: endianness settings appear wrong.\n");
 		log_err("fio: please report this to fio@vger.kernel.org\n");