LinuxTV Patchwork [v15,01/17] uaccess: add untagged_addr definition for other arches

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Submitter Andrey Konovalov
Date May 6, 2019, 4:30 p.m.
Message ID <67ae3bd92e590d42af22ef2de0ad37b730a13837.1557160186.git.andreyknvl@google.com>
Download mbox | patch
Permalink /patch/56066/
State Not Applicable
Headers show

Comments

Andrey Konovalov - May 6, 2019, 4:30 p.m.
To allow arm64 syscalls to accept tagged pointers from userspace, we must
untag them when they are passed to the kernel. Since untagging is done in
generic parts of the kernel, the untagged_addr macro needs to be defined
for all architectures.

Define it as a noop for architectures other than arm64.

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
---
 include/linux/mm.h | 4 ++++
 1 file changed, 4 insertions(+)

Patch

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 6b10c21630f5..44041df804a6 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -99,6 +99,10 @@  extern int mmap_rnd_compat_bits __read_mostly;
 #include <asm/pgtable.h>
 #include <asm/processor.h>
 
+#ifndef untagged_addr
+#define untagged_addr(addr) (addr)
+#endif
+
 #ifndef __pa_symbol
 #define __pa_symbol(x)  __pa(RELOC_HIDE((unsigned long)(x), 0))
 #endif

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