linux-kernel - [PATCH] microblaze: fix syscall_set_return

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Date:   Mon, 3 Dec 2018 06:17:33 +0300
From:   "Dmitry V. Levin" <ldv@...linux.org>
To:     Michal Simek <monstr@...str.eu>
Cc:     Elvira Khabirova <lineprinter@...linux.org>,
        Eugene Syromyatnikov <esyr@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] microblaze: fix syscall_set_return_value()

According to documentation in include/asm-generic/syscall.h,
if error argument of syscall_set_return_value() is nonzero,
it is a negated errno.

This change fixes syscall_set_return_value() implementation on
microblaze to match its own syscall_get_error(), the documentation,
and other architectures where error argument of
syscall_set_return_value() is non-positive.

Fixes: d5b37092aae1e ("microblaze: Implement include/asm/syscall.h.")
Cc: stable@...r.kernel.org # v2.6.32+
Signed-off-by: Dmitry V. Levin <ldv@...linux.org>
---
 arch/microblaze/include/asm/syscall.h | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/arch/microblaze/include/asm/syscall.h b/arch/microblaze/include/asm/syscall.h
index 220decd605a4..c2489a591d6b 100644
--- a/arch/microblaze/include/asm/syscall.h
+++ b/arch/microblaze/include/asm/syscall.h
@@ -36,10 +36,7 @@ static inline void syscall_set_return_value(struct task_struct *task,
 					    struct pt_regs *regs,
 					    int error, long val)
 {
-	if (error)
-		regs->r3 = -error;
-	else
-		regs->r3 = val;
+	regs->r3 = error ?: val;
 }
 
 static inline microblaze_reg_t microblaze_get_syscall_arg(struct pt_regs *regs,
-- 
ldv