Commit 0493cb08 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Linus Torvalds

maccess: unexport probe_kernel_write()

Patch series "clean up and streamline probe_kernel_* and friends", v4.

This series start cleaning up the safe kernel and user memory probing
helpers in mm/maccess.c, and then allows architectures to implement the
kernel probing without overriding the address space limit and temporarily
allowing access to user memory.  It then switches x86 over to this new
mechanism by reusing the unsafe_* uaccess logic.

This version also switches to the saner copy_{from,to}_kernel_nofault
naming suggested by Linus.

I kept the x86 helpers as-is without calling unsage_{get,put}_user as that
avoids a number of hard to trace casts, and it will still work with the
asm-goto based version easily.

This patch (of 20):

probe_kernel_write() is not used by any modular code.

[sfr@canb.auug.org.au: turns out that probe_user_write is used in modular code]
  Link: http://lkml.kernel.org/r/20200602195741.4faaa348@canb.auug.org.auSigned-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarStephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20200521152301.2587579-1-hch@lst.de
Link: http://lkml.kernel.org/r/20200521152301.2587579-2-hch@lst.deSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent c1e8d7c6
...@@ -121,7 +121,6 @@ long __probe_kernel_write(void *dst, const void *src, size_t size) ...@@ -121,7 +121,6 @@ long __probe_kernel_write(void *dst, const void *src, size_t size)
return ret; return ret;
} }
EXPORT_SYMBOL_GPL(probe_kernel_write);
/** /**
* probe_user_write(): safely attempt to write to a user-space location * probe_user_write(): safely attempt to write to a user-space location
......
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