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compiler.h: Make __ADDRESSABLE() symbol truly unique

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The __ADDRESSABLE() macro uses the __LINE__ macro to create a temporary
symbol which has a unique name.  However, if the macro is used multiple
times from within another macro, the line number will always be the
same, resulting in duplicate symbols.

Make the temporary symbols truly unique by using __UNIQUE_ID instead of
__LINE__.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Link: https://lore.kernel.org/r/20200818135804.564436253@infradead.org
This commit is contained in:
Josh Poimboeuf 2020-08-18 15:57:40 +02:00 committed by Ingo Molnar
parent 0db6e3734b
commit 563a02b0c9
1 changed files with 1 additions and 1 deletions
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2
include/linux/compiler.h
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@ -207,7 +207,7 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
*/
#define __ADDRESSABLE(sym) \
static void * __section(.discard.addressable) __used \
__PASTE(__addressable_##sym, __LINE__) = (void *)&sym;
__UNIQUE_ID(__PASTE(__addressable_,sym)) = (void *)&sym;
/**
* offset_to_ptr - convert a relative memory offset to an absolute pointer