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| author | Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> | 2005-09-03 15:57:22 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@evo.osdl.org> | 2005-09-05 00:06:20 -0700 |
| commit | 640aa46e25922a00b805e6b0d0b5181ad9cf736a (patch) | |
| tree | b8551775b41651905d7de27331eea1dd92c0c4d2 /arch/i386/kernel/entry.S | |
| parent | ab1c23c24471c760c573f4fb0dd78e166ddfd844 (diff) | |
| download | blackbird-op-linux-640aa46e25922a00b805e6b0d0b5181ad9cf736a.tar.gz blackbird-op-linux-640aa46e25922a00b805e6b0d0b5181ad9cf736a.zip | |
[PATCH] uml: SYSEMU: slight cleanup and speedup
As a follow-up to "UML Support - Ptrace: adds the host SYSEMU support, for
UML and general usage" (i.e. uml-support-* in current mm).
Avoid unconditionally jumping to work_pending and code copying, just reuse
the already existing resume_userspace path.
One interesting note, from Charles P. Wright, suggested that the API is
improvable with no downsides for UML (except that it will have to support
yet another host API, since dropping support for the current API, for UML,
is not reasonable from users' point of view).
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
CC: Charles P. Wright <cwright@cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/i386/kernel/entry.S')
| -rw-r--r-- | arch/i386/kernel/entry.S | 8 |
1 files changed, 1 insertions, 7 deletions
diff --git a/arch/i386/kernel/entry.S b/arch/i386/kernel/entry.S index 9a47723469c6..abb909793efc 100644 --- a/arch/i386/kernel/entry.S +++ b/arch/i386/kernel/entry.S @@ -339,18 +339,12 @@ syscall_trace_entry: xorl %edx,%edx call do_syscall_trace cmpl $0, %eax - jne syscall_skip # ret != 0 -> running under PTRACE_SYSEMU, + jne resume_userspace # ret != 0 -> running under PTRACE_SYSEMU, # so must skip actual syscall movl ORIG_EAX(%esp), %eax cmpl $(nr_syscalls), %eax jnae syscall_call jmp syscall_exit -syscall_skip: - cli # make sure we don't miss an interrupt - # setting need_resched or sigpending - # between sampling and the iret - movl TI_flags(%ebp), %ecx - jmp work_pending # perform syscall exit tracing ALIGN |
