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Message-Id: <20201202211542.1121189-1-axelrasmussen@google.com>
Date: Wed, 2 Dec 2020 13:15:42 -0800
From: Axel Rasmussen <axelrasmussen@...gle.com>
To: Shuah Khan <shuah@...nel.org>, Peter Xu <peterx@...hat.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Joe Perches <joe@...ches.com>,
Mike Rapoport <rppt@...ux.vnet.ibm.com>,
Andrea Arcangeli <aarcange@...hat.com>,
David Alan Gilbert <dgilbert@...hat.com>
Cc: Greg Thelen <gthelen@...gle.com>, linux-kselftest@...r.kernel.org,
linux-kernel@...r.kernel.org,
Axel Rasmussen <axelrasmussen@...gle.com>
Subject: [PATCH] userfaultfd: selftests: make __{s,u}64 format specifiers portable
On certain platforms (powerpcle is the one on which I ran into this),
"%Ld" and "%Lu" are unsuitable for printing __s64 and __u64,
respectively, resulting in a build warning. Cast to {u,}int64_t, and
use the PRI{d,u}64 macros defined in inttypes.h to print them. This
ought to be portable to all platforms.
Splitting this off into a separate function lets us remove some lines,
and get rid of some (I would argue) stylistically odd cases where we
joined printf() and exit() into a single statement with a ,.
Finally, this also fixes a "missing braces around initializer" warning
when we initialize prms in wp_range().
Signed-off-by: Axel Rasmussen <axelrasmussen@...gle.com>
---
tools/testing/selftests/vm/userfaultfd.c | 77 +++++++++++-------------
1 file changed, 36 insertions(+), 41 deletions(-)
diff --git a/tools/testing/selftests/vm/userfaultfd.c b/tools/testing/selftests/vm/userfaultfd.c
index 9b0912a01777..31e1ff887e4b 100644
--- a/tools/testing/selftests/vm/userfaultfd.c
+++ b/tools/testing/selftests/vm/userfaultfd.c
@@ -55,6 +55,8 @@
#include <setjmp.h>
#include <stdbool.h>
#include <assert.h>
+#include <inttypes.h>
+#include <stdint.h>
#include "../kselftest.h"
@@ -135,6 +137,12 @@ static void usage(void)
exit(1);
}
+static void uffd_error(const char *message, __s64 code)
+{
+ fprintf(stderr, "%s: %" PRId64 "\n", message, (int64_t)code);
+ exit(1);
+}
+
static void uffd_stats_reset(struct uffd_stats *uffd_stats,
unsigned long n_cpus)
{
@@ -331,7 +339,7 @@ static int my_bcmp(char *str1, char *str2, size_t n)
static void wp_range(int ufd, __u64 start, __u64 len, bool wp)
{
- struct uffdio_writeprotect prms = { 0 };
+ struct uffdio_writeprotect prms;
/* Write protection page faults */
prms.range.start = start;
@@ -340,7 +348,8 @@ static void wp_range(int ufd, __u64 start, __u64 len, bool wp)
prms.mode = wp ? UFFDIO_WRITEPROTECT_MODE_WP : 0;
if (ioctl(ufd, UFFDIO_WRITEPROTECT, &prms)) {
- fprintf(stderr, "clear WP failed for address 0x%Lx\n", start);
+ fprintf(stderr, "clear WP failed for address 0x%" PRIx64 "\n",
+ (uint64_t)start);
exit(1);
}
}
@@ -474,14 +483,11 @@ static void retry_copy_page(int ufd, struct uffdio_copy *uffdio_copy,
if (ioctl(ufd, UFFDIO_COPY, uffdio_copy)) {
/* real retval in ufdio_copy.copy */
if (uffdio_copy->copy != -EEXIST) {
- fprintf(stderr, "UFFDIO_COPY retry error %Ld\n",
- uffdio_copy->copy);
- exit(1);
+ uffd_error("UFFDIO_COPY retry error",
+ uffdio_copy->copy);
}
- } else {
- fprintf(stderr, "UFFDIO_COPY retry unexpected %Ld\n",
- uffdio_copy->copy); exit(1);
- }
+ } else
+ uffd_error("UFFDIO_COPY retry unexpected", uffdio_copy->copy);
}
static int __copy_page(int ufd, unsigned long offset, bool retry)
@@ -502,15 +508,11 @@ static int __copy_page(int ufd, unsigned long offset, bool retry)
uffdio_copy.copy = 0;
if (ioctl(ufd, UFFDIO_COPY, &uffdio_copy)) {
/* real retval in ufdio_copy.copy */
- if (uffdio_copy.copy != -EEXIST) {
- fprintf(stderr, "UFFDIO_COPY error %Ld\n",
- uffdio_copy.copy);
- exit(1);
- }
- } else if (uffdio_copy.copy != page_size) {
- fprintf(stderr, "UFFDIO_COPY unexpected copy %Ld\n",
- uffdio_copy.copy); exit(1);
- } else {
+ if (uffdio_copy.copy != -EEXIST)
+ uffd_error("UFFDIO_COPY error", uffdio_copy.copy);
+ } else if (uffdio_copy.copy != page_size)
+ uffd_error("UFFDIO_COPY unexpected copy", uffdio_copy.copy);
+ else {
if (test_uffdio_copy_eexist && retry) {
test_uffdio_copy_eexist = false;
retry_copy_page(ufd, &uffdio_copy, offset);
@@ -788,7 +790,8 @@ static int userfaultfd_open(int features)
return 1;
}
if (uffdio_api.api != UFFD_API) {
- fprintf(stderr, "UFFDIO_API error %Lu\n", uffdio_api.api);
+ fprintf(stderr, "UFFDIO_API error: %" PRIu64 "\n",
+ (uint64_t)uffdio_api.api);
return 1;
}
@@ -950,13 +953,12 @@ static void retry_uffdio_zeropage(int ufd,
offset);
if (ioctl(ufd, UFFDIO_ZEROPAGE, uffdio_zeropage)) {
if (uffdio_zeropage->zeropage != -EEXIST) {
- fprintf(stderr, "UFFDIO_ZEROPAGE retry error %Ld\n",
- uffdio_zeropage->zeropage);
- exit(1);
+ uffd_error("UFFDIO_ZEROPAGE retry error",
+ uffdio_zeropage->zeropage);
}
} else {
- fprintf(stderr, "UFFDIO_ZEROPAGE retry unexpected %Ld\n",
- uffdio_zeropage->zeropage); exit(1);
+ uffd_error("UFFDIO_ZEROPAGE retry unexpected",
+ uffdio_zeropage->zeropage);
}
}
@@ -979,26 +981,20 @@ static int __uffdio_zeropage(int ufd, unsigned long offset, bool retry)
if (ret) {
/* real retval in ufdio_zeropage.zeropage */
if (has_zeropage) {
- if (uffdio_zeropage.zeropage == -EEXIST) {
- fprintf(stderr, "UFFDIO_ZEROPAGE -EEXIST\n");
- exit(1);
- } else {
- fprintf(stderr, "UFFDIO_ZEROPAGE error %Ld\n",
- uffdio_zeropage.zeropage);
- exit(1);
- }
+ uffd_error(uffdio_zeropage.zeropage == -EEXIST ?
+ "UFFDIO_ZEROPAGE -EEXIST" :
+ "UFFDIO_ZEROPAGE error",
+ uffdio_zeropage.zeropage);
} else {
if (uffdio_zeropage.zeropage != -EINVAL) {
- fprintf(stderr,
- "UFFDIO_ZEROPAGE not -EINVAL %Ld\n",
- uffdio_zeropage.zeropage);
- exit(1);
+ uffd_error("UFFDIO_ZEROPAGE not -EINVAL",
+ uffdio_zeropage.zeropage);
}
}
} else if (has_zeropage) {
if (uffdio_zeropage.zeropage != page_size) {
- fprintf(stderr, "UFFDIO_ZEROPAGE unexpected %Ld\n",
- uffdio_zeropage.zeropage); exit(1);
+ uffd_error("UFFDIO_ZEROPAGE unexpected",
+ uffdio_zeropage.zeropage);
} else {
if (test_uffdio_zeropage_eexist && retry) {
test_uffdio_zeropage_eexist = false;
@@ -1008,9 +1004,8 @@ static int __uffdio_zeropage(int ufd, unsigned long offset, bool retry)
return 1;
}
} else {
- fprintf(stderr,
- "UFFDIO_ZEROPAGE succeeded %Ld\n",
- uffdio_zeropage.zeropage); exit(1);
+ uffd_error("UFFDIO_ZEROPAGE succeeded",
+ uffdio_zeropage.zeropage);
}
return 0;
--
2.29.2.454.gaff20da3a2-goog
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