tree 81397d2da394c3c03d59ce974611336f2f033d0c
parent c9c3395d5e3dcc6daee66c6908354d47bf98cb0c
author Al Viro <viro@zeniv.linux.org.uk> 1675140534 -0500
committer Al Viro <viro@zeniv.linux.org.uk> 1677778208 -0500

m68k: fix livelock in uaccess

m68k equivalent of 26178ec11ef3 "x86: mm: consolidate VM_FAULT_RETRY handling"
If e.g. get_user() triggers a page fault and a fatal signal is caught, we might
end up with handle_mm_fault() returning VM_FAULT_RETRY and not doing anything
to page tables.  In such case we must *not* return to the faulting insn -
that would repeat the entire thing without making any progress; what we need
instead is to treat that as failed (user) memory access.

Tested-by: Finn Thain <fthain@linux-m68k.org>
Tested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>