/*
* Copyright (C) 2016-2017 Synopsys, Inc. (www.synopsys.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#ifndef __SOC_ARC_AUX_H__
#define __SOC_ARC_AUX_H__
#ifdef CONFIG_ARC
#define read_aux_reg(r) __builtin_arc_lr(r)
/* gcc builtin sr needs reg param to be long immediate */
#define write_aux_reg(r, v) __builtin_arc_sr((unsigned int)(v), r)
#else /* !CONFIG_ARC */
static inline int read_aux_reg(u32 r)
{
return 0;
}
/*
* function helps elide unused variable warning
* see: http://lists.infradead.org/pipermail/linux-snps-arc/2016-November/001748.html
*/
static inline void write_aux_reg(u32 r, u32 v)
{
;
}
#endif
#define READ_BCR(reg, into) \
{ \
unsigned int tmp; \
tmp = read_aux_reg(reg); \
if (sizeof(tmp) == sizeof(into)) { \
into = *((typeof(into) *)&tmp); \
} else { \
extern void bogus_undefined(void); \
bogus_undefined(); \
} \
}
#define WRITE_AUX(reg, into) \
{ \
unsigned int tmp; \
if (sizeof(tmp) == sizeof(into)) { \
tmp = (*(unsigned int *)&(into)); \
write_aux_reg(reg, tmp); \
} else { \
extern void bogus_undefined(void); \
bogus_undefined(); \
} \
}
#endif
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| net-next plumbings | Tobias Klauser |
gpio: GPIO_GET_LINEEVENT_IOCTL: Reject invalid line and event flags
The GPIO_GET_LINEEVENT_IOCTL currently ignores unknown or undefined
linehandle and lineevent flags. From a backwards and forwards compatibility
viewpoint it is highly desirable to reject unknown flags though.
On one hand an application that is using newer flags and is running on
an older kernel has no way to detect if the new flags were handled
correctly if they are silently discarded.
On the other hand an application that (accidentally) passes undefined flags
will run fine on an older kernel, but may break on a newer kernel when
these flags get defined.
Ensure that requests that have undefined flags set are rejected with an
error, rather than silently discarding the undefined flags.
Cc: stable@vger.kernel.org
Fixes: 61f922db7221 ("gpio: userspace ABI for reading GPIO line events")
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>