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compiler.h: Introduce absolute_pointer macro 

Bugzilla: http://bugzilla.redhat.com/2066146

commit f6b5f1a56987de837f8e25cd560847106b8632a8
Author: Guenter Roeck <linux@roeck-us.net>
Date:   Tue Sep 14 20:52:24 2021 -0700

    compiler.h: Introduce absolute_pointer macro

    absolute_pointer() disassociates a pointer from its originating symbol
    type and context. Use it to prevent compiler warnings/errors such as

      drivers/net/ethernet/i825xx/82596.c: In function 'i82596_probe':
      arch/m68k/include/asm/string.h:72:25: error:
            '__builtin_memcpy' reading 6 bytes from a region of size 0 [-Werror=stringop-overread]

    Such warnings may be reported by gcc 11.x for string and memory
    operations on fixed addresses.

    Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
    Signed-off-by: Guenter Roeck <linux@roeck-us.net>
    Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Signed-off-by: Gopal Tiwari <gtiwari@redhat.com>
This commit is contained in:
Gopal Tiwari 2022-03-27 11:58:16 +05:30
parent 2c4674588d
commit dee73fad50
1 changed files with 2 additions and 0 deletions
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2
include/linux/compiler.h
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@ -188,6 +188,8 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
(typeof(ptr)) (__ptr + (off)); })
#endif
#define absolute_pointer(val) RELOC_HIDE((void *)(val), 0)
#ifndef OPTIMIZER_HIDE_VAR
/* Make the optimizer believe the variable can be manipulated arbitrarily. */
#define OPTIMIZER_HIDE_VAR(var) \