um: series of __get_user() is costly in sigframe handling

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It's not x86, where __get_user() is a single dereference; here it's
a single ptrace(2) call in host, which obviously costs a lot more.
IOW, it's cheaper to do copy_{to,from}_user() once than bother with
fields one by one...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>

...

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Al Viro 2011-08-18 20:00:49 +01:00 • committed by Richard Weinberger

parent 3d72210bdc

commit a955bd611d

2 changed files with 80 additions and 86 deletions

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48

arch/um/sys-i386/signal.c

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112

arch/um/sys-x86_64/signal.c

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