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34186b48d2
gcc warns that accessing a pointer based on a numeric constant may
be an offset into a NULL pointer, and would therefore has zero
accessible bytes:
arch/arm/common/sharpsl_param.c: In function ‘sharpsl_save_param’:
arch/arm/common/sharpsl_param.c:43:9: error: ‘memcpy’ reading 64 bytes from a region of size 0 [-Werror=stringop-overread]
43 | memcpy(&sharpsl_param, param_start(PARAM_BASE), sizeof(struct sharpsl_param_info));
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In this particular case, the warning is bogus since this is the actual
pointer, not an offset on a NULL pointer. Add a local variable to shut
up the warning and hope it doesn't come back.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Daniel Mack <daniel@zonque.org>
Cc: Daniel Mack <daniel@zonque.org>
Cc: Haojian Zhuang <haojian.zhuang@gmail.com>
Cc: Robert Jarzmik <robert.jarzmik@free.fr>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Linus Walleij <linus.walleij@linaro.org>
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99578
Link: https://lore.kernel.org/r/20210927145332.2784005-1-arnd@kernel.org'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Hardware parameter area specific to Sharp SL series devices
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*
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* Copyright (c) 2005 Richard Purdie
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*
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* Based on Sharp's 2.4 kernel patches
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <asm/mach/sharpsl_param.h>
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#include <asm/memory.h>
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/*
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* Certain hardware parameters determined at the time of device manufacture,
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* typically including LCD parameters are loaded by the bootloader at the
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* address PARAM_BASE. As the kernel will overwrite them, we need to store
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* them early in the boot process, then pass them to the appropriate drivers.
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* Not all devices use all parameters but the format is common to all.
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*/
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#ifdef CONFIG_ARCH_SA1100
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#define PARAM_BASE 0xe8ffc000
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#define param_start(x) (void *)(x)
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#else
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#define PARAM_BASE 0xa0000a00
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#define param_start(x) __va(x)
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#endif
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#define MAGIC_CHG(a,b,c,d) ( ( d << 24 ) | ( c << 16 ) | ( b << 8 ) | a )
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#define COMADJ_MAGIC MAGIC_CHG('C','M','A','D')
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#define UUID_MAGIC MAGIC_CHG('U','U','I','D')
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#define TOUCH_MAGIC MAGIC_CHG('T','U','C','H')
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#define AD_MAGIC MAGIC_CHG('B','V','A','D')
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#define PHAD_MAGIC MAGIC_CHG('P','H','A','D')
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struct sharpsl_param_info sharpsl_param;
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EXPORT_SYMBOL(sharpsl_param);
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void sharpsl_save_param(void)
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{
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struct sharpsl_param_info *params = param_start(PARAM_BASE);
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memcpy(&sharpsl_param, params, sizeof(*params));
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if (sharpsl_param.comadj_keyword != COMADJ_MAGIC)
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sharpsl_param.comadj=-1;
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if (sharpsl_param.phad_keyword != PHAD_MAGIC)
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sharpsl_param.phadadj=-1;
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if (sharpsl_param.uuid_keyword != UUID_MAGIC)
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sharpsl_param.uuid[0]=-1;
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if (sharpsl_param.touch_keyword != TOUCH_MAGIC)
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sharpsl_param.touch_xp=-1;
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if (sharpsl_param.adadj_keyword != AD_MAGIC)
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sharpsl_param.adadj=-1;
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}
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