lkml.org 
[lkml]   [2018]   [Feb]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
SubjectRe: [PATCH v12 22/22] selftests/vm: Fix deadlock in protection_keys.c
On Wed, 21 Feb 2018 17:55:41 -0800
Ram Pai <linuxram@us.ibm.com> wrote:

> From: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
>
> The sig_chld() handler calls dprintf2() taking care of setting
> dprint_in_signal so that sigsafe_printf() won't call printf().
> Unfortunately, this precaution is is negated by dprintf_level(), which
> has a call to fflush().
>

fflush() is not the signal-safe function list, so this makes sense.
I wonder if fflush() is needed in sigsafe_printf()?

How about?

diff --git a/tools/testing/selftests/x86/pkey-helpers.h b/tools/testing/selftests/x86/pkey-helpers.h
index b3cb7670e026..2c3b39851f10 100644
--- a/tools/testing/selftests/x86/pkey-helpers.h
+++ b/tools/testing/selftests/x86/pkey-helpers.h
@@ -29,6 +29,7 @@ static inline void sigsafe_printf(const char *format, ...)
va_start(ap, format);
if (!dprint_in_signal) {
vprintf(format, ap);
+ fflush(NULL); \
} else {
int ret;
int len = vsnprintf(dprint_in_signal_buffer,
@@ -49,7 +50,6 @@ static inline void sigsafe_printf(const char *format, ...)
#define dprintf_level(level, args...) do { \
if (level <= DEBUG_LEVEL) \
sigsafe_printf(args); \
- fflush(NULL); \
} while (0)
#define dprintf0(args...) dprintf_level(0, args)
#define dprintf1(args...) dprintf_level(1, args)

But both are equivalent I guess, so
Acked-by: Balbir Singh <bsingharora@gmail.com>

\
 
 \ /
  Last update: 2018-02-26 00:21    [W:0.234 / U:3.660 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site