From b4967dde7c475f90a2e1f6aa6f0a5c0a3aae1175 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Mon, 8 Jun 2020 21:33:58 -0700 Subject: [PATCH] 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.au Signed-off-by: Christoph Hellwig Signed-off-by: Stephen Rothwell Signed-off-by: Andrew Morton Cc: Alexei Starovoitov Cc: Daniel Borkmann Cc: Masami Hiramatsu Cc: Ingo Molnar Cc: "H. Peter Anvin" Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/20200521152301.2587579-1-hch@lst.de Link: http://lkml.kernel.org/r/20200521152301.2587579-2-hch@lst.de Signed-off-by: Linus Torvalds --- mm/maccess.c | 1 - 1 file changed, 1 deletion(-) diff --git a/mm/maccess.c b/mm/maccess.c index 81df3b788284d..a2b22295d8ea3 100644 --- a/mm/maccess.c +++ b/mm/maccess.c @@ -121,7 +121,6 @@ long __probe_kernel_write(void *dst, const void *src, size_t size) return ret; } -EXPORT_SYMBOL_GPL(probe_kernel_write); /** * probe_user_write(): safely attempt to write to a user-space location -- 2.39.5