kernel.git/arch/um/include/shared, branch linux-3.18.y

um: Remove copy&paste code from init.h

2018-02-07T19:07:53Z

commit 30b11ee9ae23d78de66b9ae315880af17a64ba83 upstream. As we got rid of the __KERNEL__ abuse, we can directly include linux/compiler.h now. This also allows gcc 5 to build UML. Reported-by: Hans-Werner Hilse Signed-off-by: Richard Weinberger Cc: Greg Hackmann Cc: Bernie Innocenti Cc: Lorenzo Colitti Signed-off-by: Greg Kroah-Hartman

um: Stop abusing KERNEL

2018-02-07T19:07:53Z

commit 298e20ba8c197e8d429a6c8671550c41c7919033 upstream. Currently UML is abusing __KERNEL__ to distinguish between kernel and host code (os-Linux). It is better to use a custom define such that existing users of __KERNEL__ don't get confused. Signed-off-by: Richard Weinberger Cc: Greg Hackmann Cc: Bernie Innocenti Cc: Lorenzo Colitti Signed-off-by: Greg Kroah-Hartman

um: delete unnecessary bootmem struct page array

2014-10-13T15:15:09Z

1) uml kernel bootmem managed through bootmem_data->node_bootmem_map, not the struct page array, so the array is unnecessary. 2) the bootmem struct page array has been pointed by a *local* pointer, struct page *map, in init_maps function. The array can be accessed only in init_maps's scope. As a result, uml kernel wastes about 1% of total memory. Signed-off-by: Honggang Li Signed-off-by: Richard Weinberger

um: Use get_signal() signal_setup_done()

2014-08-06T11:03:41Z

Use the more generic functions get_signal() signal_setup_done() for signal delivery. Signed-off-by: Richard Weinberger

um: Memory corruption on startup

2014-04-20T21:57:21Z

The reverse case of this race (you must msync before read) is well known. This is the not so common one. It can be triggered only on systems which do a lot of task switching and only at UML startup. If you are starting 200+ UMLs ~ 0.5% will always die without this fix. Signed-off-by: Anton Ivanov [rw: minor whitespace fixes] Signed-off-by: Richard Weinberger

um: Remove unused declarations from

2013-11-17T10:39:22Z

_end is used, but it's already provided by , so use that. Signed-off-by: Geert Uytterhoeven Cc: Richard Weinberger Cc: user-mode-linux-devel@lists.sourceforge.net Signed-off-by: Richard Weinberger

um: Make stack trace reliable against kernel mode faults

2013-11-17T10:27:30Z

As UML uses an alternative signal stack we cannot use the current stack pointer for stack dumping if UML itself dies by SIGSEGV. To bypass this issue we save regs taken from mcontext in our segv handler into thread_struct and use these regs to obtain the stack pointer in show_stack(). Signed-off-by: Richard Weinberger

um: Cleanup SIGTERM handling

2013-09-07T08:56:58Z

Richard reported that some UML processes survive if the UML main process receives a SIGTERM. This issue was caused by a wrongly placed signal(SIGTERM, SIG_DFL) in init_new_thread_signals(). It disabled the UML exit handler accidently for some processes. The correct solution is to disable the fatal handler for all UML helper threads/processes. Such that last_ditch_exit() does not get called multiple times and all processes can exit due to SIGTERM. Reported-and-tested-by: Richard W.M. Jones Signed-off-by: Richard Weinberger

um: ubd: Add REQ_FLUSH suppport

2013-09-07T08:56:49Z

UML's block device driver does not support write barriers, to support this this patch adds REQ_FLUSH suppport. Every time the block layer sends a REQ_FLUSH we fsync() now our backing file to guarantee data consistency. Reported-and-tested-by: Richard W.M. Jones Signed-off-by: Richard Weinberger

um: Implement probe_kernel_read()

2013-09-07T08:38:34Z

UML needs it's own probe_kernel_read() to handle kernel mode faults correctly. The implementation uses mincore() on the host side to detect whether a page is owned by the UML kernel process. This fixes also a possible crash when sysrq-t is used. Starting with 3.10 sysrq-t calls probe_kernel_read() to read details from the kernel workers. As kernel worker are completely async pointers may turn NULL while reading them. Cc: Cc: Cc: # 3.10.x Signed-off-by: Richard Weinberger