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| author | Al Viro <viro@zeniv.linux.org.uk> | 2012-11-05 13:00:27 -0500 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2012-11-29 00:01:23 -0500 |
| commit | 22062a96300dabfef93368a28c34bdf35c9b8308 (patch) | |
| tree | 6e04303c437911d21079a34ac0853137eeb91f8b /arch/alpha/include | |
| parent | 4f4202fe5ae9a43e59303f20d700571f695d7b1b (diff) | |
| download | lwn-22062a96300dabfef93368a28c34bdf35c9b8308.tar.gz lwn-22062a96300dabfef93368a28c34bdf35c9b8308.zip | |
new helper: signal_pt_regs()
Always equal to task_pt_regs(current); defined only when we are in
signal delivery. It may be different from current_pt_regs() - e.g.
architectures like m68k may have pt_regs location on exception
different from that on a syscall and signals (just as ptrace handling)
may happen on exceptions as well as on syscalls.
When they are equal, it's often better to have signal_pt_regs
defined (in asm/ptrace.h) as current_pt_regs - that tends to be
optimized better than default would be. However, optimisation is
the only reason why we might want an arch-specific definition;
if current_pt_regs() and task_pt_regs(current) have different
values, the latter one is right.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/alpha/include')
| -rw-r--r-- | arch/alpha/include/asm/ptrace.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/alpha/include/asm/ptrace.h b/arch/alpha/include/asm/ptrace.h index b87755a19554..b4c5b2fbb647 100644 --- a/arch/alpha/include/asm/ptrace.h +++ b/arch/alpha/include/asm/ptrace.h @@ -78,6 +78,7 @@ struct switch_stack { #define current_pt_regs() \ ((struct pt_regs *) ((char *)current_thread_info() + 2*PAGE_SIZE) - 1) +#define signal_pt_regs current_pt_regs #define force_successful_syscall_return() (current_pt_regs()->r0 = 0) |