BMC/Intel-BMC/linux.git/arch/x86/um/vdso, branch dev

um: Add asm/elf.h to vma.c

2015-05-31T15:31:50+00:00

um_vdso_addr is defined in asm/elf.h. Signed-off-by: Richard Weinberger

x86, vdso: Clean up 32-bit vs 64-bit vdso params

2014-05-05T20:18:40+00:00

Rather than using 'vdso_enabled' and an awful #define, just call the parameters vdso32_enabled and vdso64_enabled. Signed-off-by: Andy Lutomirski Link: http://lkml.kernel.org/r/87913de56bdcbae3d93917938302fc369b05caee.1399317206.git.luto@amacapital.net Signed-off-by: H. Peter Anvin

um/vdso: add .gitignore for a couple of targets

2013-11-17T10:32:07+00:00

Cc: Richard Weinberger Signed-off-by: Ramkumar Ramachandra Signed-off-by: Richard Weinberger

coredump: remove VM_ALWAYSDUMP flag

2012-03-23T23:58:42+00:00

The motivation for this patchset was that I was looking at a way for a qemu-kvm process, to exclude the guest memory from its core dump, which can be quite large. There are already a number of filter flags in /proc//coredump_filter, however, these allow one to specify 'types' of kernel memory, not specific address ranges (which is needed in this case). Since there are no more vma flags available, the first patch eliminates the need for the 'VM_ALWAYSDUMP' flag. The flag is used internally by the kernel to mark vdso and vsyscall pages. However, it is simple enough to check if a vma covers a vdso or vsyscall page without the need for this flag. The second patch then replaces the 'VM_ALWAYSDUMP' flag with a new 'VM_NODUMP' flag, which can be set by userspace using new madvise flags: 'MADV_DONTDUMP', and unset via 'MADV_DODUMP'. The core dump filters continue to work the same as before unless 'MADV_DONTDUMP' is set on the region. The qemu code which implements this features is at: http://people.redhat.com/~jbaron/qemu-dump/qemu-dump.patch In my testing the qemu core dump shrunk from 383MB -> 13MB with this patch. I also believe that the 'MADV_DONTDUMP' flag might be useful for security sensitive apps, which might want to select which areas are dumped. This patch: The VM_ALWAYSDUMP flag is currently used by the coredump code to indicate that a vma is part of a vsyscall or vdso section. However, we can determine if a vma is in one these sections by checking it against the gate_vma and checking for a non-NULL return value from arch_vma_name(). Thus, freeing a valuable vma bit. Signed-off-by: Jason Baron Acked-by: Roland McGrath Cc: Chris Metcalf Cc: Avi Kivity Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

um: Fix kmalloc argument order in um/vdso/vma.c

2011-11-02T13:15:42+00:00

kmalloc size is 1st arg, not second. Signed-off-by: Dave Jones Signed-off-by: Richard Weinberger Cc: # 3.0.x [richard@nod.at: on 3.0 the to be patched file is arch/um/sys-x86_64/vdso/vma.c]

um: fix gcov build breakage

2011-11-02T13:15:26+00:00

a) exports in gmon_syms.c duplicate kernel/gcov/* ones b) excluding -pg in vdso compile is not enough - -fprofile-arcs and -ftest-coverage also needs to be excluded Signed-off-by: Al Viro Signed-off-by: Richard Weinberger

um: take arch/um/sys-x86 to arch/x86/um

2011-11-02T13:15:05+00:00

Signed-off-by: Al Viro Signed-off-by: Richard Weinberger