+ hexagon-define-syscall_get_error-and-syscall_get_return_value.patch added to -mm tree

[akpm@xxxxxxxxxxxxxxxxxxxx]

The patch titled
     Subject: hexagon: define syscall_get_error() and syscall_get_return_value()
has been added to the -mm tree.  Its filename is
     hexagon-define-syscall_get_error-and-syscall_get_return_value.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/hexagon-define-syscall_get_error-and-syscall_get_return_value.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/hexagon-define-syscall_get_error-and-syscall_get_return_value.patch

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------------------------------------------------------
From: "Dmitry V. Levin" <ldv@xxxxxxxxxxxx>
Subject: hexagon: define syscall_get_error() and syscall_get_return_value()

syscall_get_* functions are required to be implemented on all
architectures in order to extend the generic ptrace API with
PTRACE_GET_SYSCALL_INFO request.

This adds remaining 2 syscall_get_* functions as documented in
asm-generic/syscall.h: syscall_get_error and syscall_get_return_value.

Link: http://lkml.kernel.org/r/20190510152756.GB28558@xxxxxxxxxxxx
Signed-off-by: Dmitry V. Levin <ldv@xxxxxxxxxxxx>
Cc: Richard Kuo <rkuo@xxxxxxxxxxxxxx>
Cc: Elvira Khabirova <lineprinter@xxxxxxxxxxxx>
Cc: Eugene Syromyatnikov <esyr@xxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Greentime Hu <greentime@xxxxxxxxxxxxx>
Cc: Helge Deller <deller@xxxxxx>	[parisc]
Cc: James E.J. Bottomley <jejb@xxxxxxxxxxxxxxxx>
Cc: James Hogan <jhogan@xxxxxxxxxx>
Cc: kbuild test robot <lkp@xxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Paul Burton <paul.burton@xxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Cc: Vincent Chen <deanbo422@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 arch/hexagon/include/asm/syscall.h |   14 ++++++++++++++
 1 file changed, 14 insertions(+)

--- a/arch/hexagon/include/asm/syscall.h~hexagon-define-syscall_get_error-and-syscall_get_return_value
+++ a/arch/hexagon/include/asm/syscall.h
@@ -22,6 +22,8 @@
 #define _ASM_HEXAGON_SYSCALL_H
 
 #include <uapi/linux/audit.h>
+#include <linux/err.h>
+#include <asm/ptrace.h>
 
 typedef long (*syscall_fn)(unsigned long, unsigned long,
 	unsigned long, unsigned long,
@@ -44,6 +46,18 @@ static inline void syscall_get_arguments
 	memcpy(args, &(&regs->r00)[0], 6 * sizeof(args[0]));
 }
 
+static inline long syscall_get_error(struct task_struct *task,
+				     struct pt_regs *regs)
+{
+	return IS_ERR_VALUE(regs->r00) ? regs->r00 : 0;
+}
+
+static inline long syscall_get_return_value(struct task_struct *task,
+					    struct pt_regs *regs)
+{
+	return regs->r00;
+}
+
 static inline int syscall_get_arch(struct task_struct *task)
 {
 	return AUDIT_ARCH_HEXAGON;
_

Patches currently in -mm which might be from ldv@xxxxxxxxxxxx are

nds32-fix-asm-syscallh.patch
hexagon-define-syscall_get_error-and-syscall_get_return_value.patch
mips-define-syscall_get_error.patch
parisc-define-syscall_get_error.patch
powerpc-define-syscall_get_error.patch
selftests-ptrace-add-a-test-case-for-ptrace_get_syscall_info.patch