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Commit 9d630924 authored by Andrey Konovalov's avatar Andrey Konovalov Committed by Alistair Delva
Browse files

UPSTREAM: uaccess: add noop untagged_addr definition 



(Upstream commit d93445225cd3c8eb0bf1350c04875576428b45b4).

Architectures that support memory tagging have a need to perform untagging
(stripping the tag) in various parts of the kernel. This patch adds an
untagged_addr() macro, which is defined as noop for architectures that do
not support memory tagging. The oncoming patch series will define it at
least for sparc64 and arm64.

Acked-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Reviewed-by: default avatarKhalid Aziz <khalid.aziz@oracle.com>
Signed-off-by: default avatarAndrey Konovalov <andreyknvl@google.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: default avatarAndrey Konovalov <andreyknvl@google.com>
Bug: 135692346
Change-Id: If3932582c82e302fe8d602fabac9a8f4cde6388d
parent 1bae2175

include/linux/mm.h

+11 −0
Original line number Diff line number Diff line
@@ -73,6 +73,17 @@ extern int mmap_rnd_compat_bits __read_mostly; 
#include <asm/pgtable.h>

#include <asm/processor.h>



/*

 * Architectures that support memory tagging (assigning tags to memory regions,

 * embedding these tags into addresses that point to these memory regions, and

 * checking that the memory and the pointer tags match on memory accesses)

 * redefine this macro to strip tags from pointers.

 * It's defined as noop for arcitectures that don't support memory tagging.

 */

#ifndef untagged_addr

#define untagged_addr(addr) (addr)

#endif



#ifndef __pa_symbol

#define __pa_symbol(x)  __pa(RELOC_HIDE((unsigned long)(x), 0))

#endif