linux-kernel - [PATCH] ia64: fix syscall_get

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Message-ID: <20181203031725.GA11573@altlinux.org>
Date:   Mon, 3 Dec 2018 06:17:25 +0300
From:   "Dmitry V. Levin" <ldv@...linux.org>
To:     Tony Luck <tony.luck@...el.com>, Fenghua Yu <fenghua.yu@...el.com>
Cc:     Elvira Khabirova <lineprinter@...linux.org>,
        Eugene Syromyatnikov <esyr@...hat.com>,
        linux-ia64@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] ia64: fix syscall_get_error()

According to documentation in include/asm-generic/syscall.h,
syscall_get_error() should return -ERRORCODE if the system call failed.

This change fixes syscall_get_error() implementation on ia64 to match
its own syscall_set_return_value(), the documentation, and other
architectures where syscall_get_error() returns a non-positive value.

Fixes: cfb361f13c81 ("[IA64] utrace syscall.h support for ia64")
Cc: stable@...r.kernel.org # v2.6.27+
Signed-off-by: Dmitry V. Levin <ldv@...linux.org>
---
 arch/ia64/include/asm/syscall.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/ia64/include/asm/syscall.h b/arch/ia64/include/asm/syscall.h
index 1d0b875fec44..4ccf888c083d 100644
--- a/arch/ia64/include/asm/syscall.h
+++ b/arch/ia64/include/asm/syscall.h
@@ -35,7 +35,7 @@ static inline void syscall_rollback(struct task_struct *task,
 static inline long syscall_get_error(struct task_struct *task,
 				     struct pt_regs *regs)
 {
-	return regs->r10 == -1 ? regs->r8:0;
+	return regs->r10 == -1 ? -regs->r8 : 0;
 }
 
 static inline long syscall_get_return_value(struct task_struct *task,
-- 
ldv