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Jan Beulich
ae5758a1a7
Commitfad1a86e25("procfs: call default get_unmapped_area on MMU-present architectures"), as its title says, took care of only the MMU case, leaving the !MMU side still in the regressed state (returning -EIO in all cases where pde->proc_fops->get_unmapped_area is NULL). From thefad1a86e25changelog: "Commitc4fe244857("sparc: fix PCI device proc file mmap(2)") added proc_reg_get_unmapped_area in proc_reg_file_ops and proc_reg_file_ops_no_compat, by which now mmap always returns EIO if get_unmapped_area method is not defined for the target procfs file, which causes regression of mmap on /proc/vmcore. To address this issue, like get_unmapped_area(), call default current->mm->get_unmapped_area on MMU-present architectures if pde->proc_fops->get_unmapped_area, i.e. the one in actual file operation in the procfs file, is not defined" Signed-off-by: Jan Beulich <[email protected]> Cc: HATAYAMA Daisuke <[email protected]> Cc: Alexey Dobriyan <[email protected]> Cc: David S. Miller <[email protected]> Cc: <[email protected]> [3.12.x] Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>